<PAGE>   1

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--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                            ------------------------

                                 AMENDMENT NO.1

 (This Amendment No.1 is filed as a result of the correction of a mathematical
  computation of diluted earnings (loss) per share for the twelve-month period
                             ended March 31, 1999)

                            ------------------------

                                   FORM 10-Q/A

(MARK ONE)

[X]             QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 1999, or

[ ]            TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM                     TO

COMMISSION FILE NUMBER 1-10070

                             MCN ENERGY GROUP INC.

             (Exact name of registrant as specified in its charter)

                                    MICHIGAN
                        (State or other jurisdiction of
                         incorporation or organization)

                     500 GRISWOLD STREET, DETROIT, MICHIGAN
                    (Address of principal executive offices)
                                   38-2820658
                                (I.R.S. Employer
                              Identification No.)

                                     48226
                                   (Zip Code)

        Registrant's telephone number, including area code 313-256-5500

                                   NO CHANGES
   (Former name, former address and former fiscal year, if changed since last
                                    report.)

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

                           Yes [ ]             No [X]

     Number of shares outstanding of each of the registrant's classes of common
stock, as of May 28, 1999:

               Common Stock, par value $.01 per share: 85,655,381

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<PAGE>   2

                               INDEX TO FORM 10-Q/A

                        FOR QUARTER ENDED MARCH 31, 1999

<TABLE>
<CAPTION>
                                                               PAGE
                                                              NUMBER
                                                              ------
<S>                                                           <C>
COVER.......................................................     i
INDEX.......................................................    ii
PART I -- FINANCIAL INFORMATION
Item 1. Financial Statements................................    19
Item 2. Management's Discussion and Analysis of Financial
        Condition and Results of Operations.................     1
PART II -- OTHER INFORMATION
Item 4. Submission of Matters to a Vote of Security
        Holders.............................................    38
Item 6. Exhibits and Reports on Form 8-K....................    39
SIGNATURE...................................................    40
</TABLE>

                                       ii
<PAGE>   3

                             MCN ENERGY GROUP INC.

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

RESULTS OF OPERATIONS

Special investigation results in restatement -- As discussed in MCN's 1998
Annual Report on Form 10-K/A, subsequent to the issuance of MCN's December 31,
1998 financial statements, certain matters came to management's attention and
resulted in a special investigation of prior years' operations of CoEnergy
Trading Company (CTC), MCN's non-utility energy marketing subsidiary. As a
result of the investigation, MCN identified that its internal controls had been
overridden and that certain transactions had not been properly accounted for.
Specifically, the investigation concluded that CTC had entered into gas supply
contracts and agreed to pay significantly less than market prices in one period
in return for above-market prices to be paid in subsequent periods through March
2000. The effect of these transactions was to improperly delay the accrual of
cost of gas expenses, resulting in the understatement of net income for the 1998
first quarter by $.9 million and the overstatement of net income for the 1998
twelve-month period by $5.5 million.

Additionally, the investigation identified that CTC had entered into certain
unauthorized gas purchase and sale contracts for trading purposes. The
unauthorized transactions violate MCN's risk-management policy that requires all
such activities to be reviewed and approved by a risk committee that reports
regularly to the MCN Board of Directors. The gas purchase and sale contracts
entered into in connection with trading activities, some of which remain in
effect through March 2000, were not accounted for properly using the required
mark-to-market method, under which unrealized gains and losses are recorded as
an adjustment to cost of gas. The effect of not properly accounting for these
transactions was the overstatement of net income for the 1998 first quarter by
$2.5 million and the overstatement of net income for the 1998 twelve-month
period by $3.2 million. However, net income of $.9 million and $2.7 million was
realized and recorded in connection with these trading activities in the 1998
quarter and twelve-month period, respectively, resulting in a net loss of $1.6
million in the 1998 first quarter and $.5 million in the 1998 twelve-month
period from such activities. From the inception of these trading activities in
March 1997 through March 1999, $5.7 million of net income was realized and
recorded in connection with these trading activities. However, marking these
contracts to market, as required, results in a previously unrecorded net
unrealized loss of $8.4 million through March 1999, indicating a net loss of
$2.7 million from such activities.

Other items identified during the investigation resulted in the overstatement of
net income for the 1998 first quarter by $.02 million and the overstatement of
net income for the 1998 twelve-month period by $.1 million.

As described in Note 2 to the Consolidated Financial Statements, the
accompanying consolidated financial statements have been restated from those
originally reported to properly account for the transactions identified,
resulting in a decrease in net income of $1.6 million or $.02 per diluted share
for the 1998 first quarter and $8.8 million or $.11 per diluted share for the
1998 twelve-month period. The corrections did not have an impact on the
liquidity or cash flows of MCN. The financial information contained in
Management's Discussion and Analysis herein has been revised to reflect the
impact of such restatement.

                                        1
<PAGE>   4
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

Results from first quarter rise -- MCN's earnings for the 1999 first quarter
increased to $85.5 million or $1.02 per diluted share compared with earnings of
$78.9 million or $.95 per diluted share in the 1998 quarter. MCN experienced a
loss in the 1999 twelve-month period of $279.8 million or $3.54 per diluted
share compared with earnings of $132.2 million or $1.70 per diluted share in the
same 1998 period. As subsequently discussed, the comparability of earnings was
affected by the impact of non-recurring items consisting of an accounting
change, discontinued operations and several unusual charges.

<TABLE>
<CAPTION>
                                                                 QUARTER         12 MONTHS
                                                              -------------   ----------------
                                                              1999    1998     1999      1998
                                                              -----   -----   -------   ------
<S>                                                           <C>     <C>     <C>       <C>
NET INCOME (LOSS) (in Millions)
Diversified Energy:
  Before unusual charges....................................  $ 4.1   $14.3   $   2.3   $ 30.2
  Unusual charges (Note 5)..................................     --      --     (97.9)      --
                                                              -----   -----   -------   ------
                                                                4.1    14.3     (95.6)    30.2
                                                              -----   -----   -------   ------
Gas Distribution:
  Before unusual charges....................................   84.3    62.7     110.1     79.9
  Unusual charges (Note 5)..................................     --      --     (16.7)      --
                                                              -----   -----   -------   ------
                                                               84.3    62.7      93.4     79.9
                                                              -----   -----   -------   ------
Total From Continuing Operations:
  Before unusual charges....................................   88.4    77.0     112.4    110.1
  Unusual charges (Note 5)..................................     --      --    (114.6)      --
                                                              -----   -----   -------   ------
                                                               88.4    77.0      (2.2)   110.1
Discontinued Operations (Note 6)............................     --     1.9    (274.7)    22.1
Cumulative Effect of Accounting Change, Net of Taxes
(Note 3)....................................................   (2.9)     --      (2.9)      --
                                                              -----   -----   -------   ------
                                                              $85.5   $78.9   $(279.8)  $132.2
                                                              =====   =====   =======   ======
DILUTED EARNINGS (LOSS) PER SHARE
Diversified Energy:
  Before unusual charges....................................  $ .07   $ .19   $   .03   $  .45
  Unusual charges (Note 5)..................................     --      --     (1.24)      --
                                                              -----   -----   -------   ------
                                                                .07     .19     (1.21)     .45
                                                              -----   -----   -------   ------
Gas Distribution:
  Before unusual charges....................................    .99     .74      1.39      .98
  Unusual charges (Note 5)..................................     --      --      (.21)      --
                                                              -----   -----   -------   ------
                                                                .99     .74      1.18      .98
                                                              -----   -----   -------   ------
Total From Continuing Operations:
  Before unusual charges....................................   1.06     .93      1.42     1.43
  Unusual charges (Note 5)..................................     --      --     (1.45)      --
                                                              -----   -----   -------   ------
                                                               1.06     .93      (.03)    1.43
Discontinued Operations (Note 6)............................     --     .02     (3.47)     .27
Cumulative Effect of Accounting Change (Note 3).............   (.04)     --      (.04)      --
                                                              -----   -----   -------   ------
                                                              $1.02   $ .95   $ (3.54)  $ 1.70
                                                              =====   =====   =======   ======
</TABLE>

Excluding the non-recurring items, MCN's earnings from continuing operations
increased $11.4 million for the 1999 first quarter and $2.3 million for the 1999
twelve-month period, as compared to the corresponding 1998 periods. The earnings
comparisons reflect increased contributions from the Gas Distribution segment
resulting from its new gas sales program and the favorable

                                        2
<PAGE>   5
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

impact of weather. Also affecting the comparability were gains recorded by the
Diversified Energy group in the 1998 periods from the sale of certain assets.

STRATEGIC DIRECTION -- MCN's objective is to achieve competitive, long-term
returns for its shareholders. MCN is pursuing a growth strategy by investing in
a diverse portfolio of energy-related projects. Inherent in this
portfolio-management strategy is the frequent review of internal and external
factors affecting the company's investments. Therefore, the pace of new
investments and the disposition of existing assets are subject to change.
Reflecting this strategy, MCN has decided to: sell its Exploration & Production
(E&P) oil and gas properties in whole or part; and reduce planned capital
investment levels to approximately $600 million to $750 million annually, which
will be invested primarily in North America. MCN will continue to review the
overall mix of its existing portfolio and the level of new investments.

UNUSUAL CHARGES -- As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN
recorded several unusual charges in the 1998 second and third quarters,
consisting of property write-downs, investment losses and restructuring charges.
The unusual charges reduced earnings for the 1999 twelve-month period by $114.6
million or $1.45 per diluted share (Note 5).

<TABLE>
<CAPTION>
                                                               TWELVE MONTHS ENDED
                                                                  MARCH 31, 1999
                                                              ----------------------
                                                                NET          DILUTED
                                                              INCOME           EPS
                                                              -------        -------
<S>                                                           <C>            <C>
UNUSUAL CHARGES (in Millions, Except Per Share Amounts)
Diversified Energy:
  Pipelines & Processing....................................  $ (89.5)       $(1.13)
  Electric Power............................................     (1.6)         (.02)
  Corporate & Other.........................................     (6.8)         (.09)
                                                              -------        ------
                                                                (97.9)        (1.24)
Gas Distribution............................................    (16.7)         (.21)
                                                              -------        ------
                                                              $(114.6)       $(1.45)
                                                              =======        ======
</TABLE>

DIVERSIFIED ENERGY
Results reflect lower methanol prices and production, higher financing costs and
1998 gains -- The Diversified Energy group's earnings were $4.1 million for the
1999 first quarter compared to $14.3 million for the same 1998 period.
Diversified Energy had losses of $95.6 million in the 1999 twelve-month period
compared to earnings of $30.2 million in the same 1998 period due to the
property write-downs, investment loss and restructuring charges, as previously
discussed. Excluding these unusual charges, Diversified Energy's earnings for
the 1999 twelve-month period declined by $27.9 million from the corresponding
1998 period. The results for both 1999 periods reflect the impact of lower
methanol prices and methanol production on operating and joint venture income as
well as higher financing costs. The earnings comparisons were also affected by
gains recorded in the 1998 periods from the sale of certain assets.
Additionally, Diversified Energy's results for the 1999 twelve-month period
reflect operating costs related to its coal fines project. Partially offsetting
the

                                        3
<PAGE>   6
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

decreases in the 1999 first quarter and twelve-month period were increased
operating and joint venture income posted by the Electric Power and Energy
Marketing segments.

<TABLE>
<CAPTION>
                                                               QUARTER           12 MONTHS
                                                           ---------------   -----------------
                                                            1999     1998      1999      1998
                                                           ------   ------   --------   ------
<S>                                                        <C>      <C>      <C>        <C>
DIVERSIFIED ENERGY OPERATIONS (in Millions)
Operating Revenues*......................................  $264.7   $229.0   $  878.0   $811.0
                                                           ------   ------   --------   ------
Operating Expenses*
  Property write-downs and restructuring charges
  (Note 5)...............................................      --       --      150.6       --
  Other..................................................   258.8    232.6      894.4    821.7
                                                           ------   ------   --------   ------
                                                            258.8    232.6    1,045.0    821.7
                                                           ------   ------   --------   ------
Operating Income (Loss)..................................     5.9     (3.6)    (167.0)   (10.7)
                                                           ------   ------   --------   ------
Equity in Earnings of Joint Ventures.....................    12.0     16.3       56.9     54.2
                                                           ------   ------   --------   ------
Other Income & (Deductions)*
  Interest income........................................      .4      3.2        2.0      8.6
  Interest expense.......................................    (8.3)    (2.8)     (27.4)   (10.1)
  Dividends on preferred securities of subsidiaries......    (5.0)    (5.2)     (17.4)   (17.9)
  Other..................................................      .9     12.8         .2     20.1
                                                           ------   ------   --------   ------
                                                            (12.0)     8.0      (42.6)      .7
                                                           ------   ------   --------   ------
Income (Loss) Before Income Taxes........................     5.9     20.7     (152.7)    44.2
Income Tax Provision (Benefit)...........................     1.8      6.4      (57.1)    14.0
                                                           ------   ------   --------   ------
Net Income (Loss)
  Before unusual charges.................................     4.1     14.3        2.3     30.2
  Unusual charges (Note 5)...............................      --       --      (97.9)      --
                                                           ------   ------   --------   ------
                                                           $  4.1   $ 14.3   $  (95.6)  $ 30.2
                                                           ======   ======   ========   ======
</TABLE>

* Includes intercompany transactions

OPERATING AND JOINT VENTURE INCOME
Operating and joint venture results for the 1999 first quarter increased by $5.2
million, and for the 1999 twelve-month period, excluding the unusual charges,
declined by $3.0 million. Results for both 1999 periods reflect reduced
contributions from the Pipelines & Processing segment, increased earnings from
the Electric Power and Energy Marketing segments and lower Corporate & Other
expenses.

<TABLE>
<CAPTION>
                                                                 QUARTER         12 MONTHS
                                                              -------------   ---------------
                                                              1999    1998     1999     1998
                                                              -----   -----   -------   -----
<S>                                                           <C>     <C>     <C>       <C>
OPERATING AND JOINT VENTURE INCOME (LOSS) (in Millions)
Before Unusual Charges:
  Pipelines & Processing....................................  $ 4.9   $ 9.4   $  16.9   $31.3
  Electric Power............................................    7.5     5.6      27.9    21.5
  Energy Marketing..........................................    5.2     0.5       1.0    (3.7)
  Corporate & Other.........................................     .3    (2.8)     (5.3)   (5.6)
                                                              -----   -----   -------   -----
                                                               17.9    12.7      40.5    43.5
Unusual Charges (Note 5)....................................     --      --    (150.6)     --
                                                              -----   -----   -------   -----
                                                              $17.9   $12.7   $(110.1)  $43.5
                                                              =====   =====   =======   =====
</TABLE>

                                        4
<PAGE>   7
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

PIPELINES & PROCESSING operating and joint venture results, excluding the
write-offs, decreased by $4.5 million and $14.4 million for the 1999 first
quarter and twelve-month period, respectively. The 1999 periods reflect reduced
earnings from MCN's 25%-owned methanol production business resulting from lower
methanol prices as well as lower volumes produced. Earnings from the methanol
production business benefited from strong methanol prices during 1997 and early
1998, but prices have weakened since. Pipelines & Processing's average methanol
sales prices declined 40% for the current quarter and 44% for the 1999
twelve-month period. Methanol production declined 7.4 million gallons for the
1999 first quarter and 8.1 million gallons for the 1999 twelve-month period due
to the shutdown of the methanol plant for scheduled maintenance in March 1999.
Additionally, Pipelines & Processing results for the 1999 twelve-month period
were impacted by $4.4 million of operating losses related to the start-up of the
coal fines plants.

Pipelines & Processing operating and joint venture income was also affected by
an increase in transportation volumes for the 1999 periods due to new gas
gathering ventures and the expansion of existing pipeline projects. Volumes
transported increased for the 1999 first quarter and twelve-month period by 6.2
billion cubic feet (Bcf) and 42.8 Bcf, respectively. Pipelines & Processing
results were also impacted in the 1999 first quarter by a decrease in gas
processed to remove natural gas liquids (NGLs) as well as lower processing
margins. The decrease was due to the bypassing of NGL plants as a result of
weaker NGL prices. The increase in gas processed to remove NGLs in the 1999
twelve-month period reflects volumes associated with the acquisition of
additional processing facilities in late 1997. The volume of carbon dioxide
(CO(2)) treated increased .5 Bcf and 4.1 Bcf in the 1999 first quarter and
twelve-month period, respectively. However, earnings were not significantly
affected since under the terms of Pipelines & Processing's CO(2) processing
contracts, revenues are not volume sensitive. Start-up expenses associated with
new projects also unfavorably affected Pipelines & Processing 1999 results.

<TABLE>
<CAPTION>
                                                                QUARTER       12 MONTHS
                                                              -----------   -------------
                                                              1999   1998   1999    1998
                                                              ----   ----   -----   -----
<S>                                                           <C>    <C>    <C>     <C>
PIPELINES & PROCESSING STATISTICS*
  Methanol Produced (million gallons).......................  8.1    15.5    53.0    61.1
  Transportation (Bcf)......................................  48.1   41.9   181.7   138.9
  Gas Processed (Bcf):
     Carbon Dioxide Treatment...............................  12.8   12.3    49.4    45.3
     Natural Gas Liquids Removal............................  8.9    10.3    43.6    28.7
                                                              ----   ----   -----   -----
                                                              21.7   22.6    93.0    74.0
                                                              ====   ====   =====   =====
</TABLE>

* Includes MCN's share of joint ventures

ELECTRIC POWER operating and joint venture results, excluding the restructuring
charges, increased by $1.9 million and $6.4 million for the 1999 first quarter
and twelve-month period, respectively. The improvement in earnings for both
periods reflects increased contributions from the 1,370 megawatt (MW) Midland
Cogeneration Venture (MCV) facility, as a result of an increase in MCN's
interest in the MCV partnership from 18% to 23% in June 1998. Earnings from the
MCV partnership for the 1999 periods also include a favorable $2.1 million
pre-tax adjustment for the resolution of a number of contract issues with the
electricity purchaser. Also contributing to the favorable 1999 results were
higher earnings from MCN's 50%-owned, 123 MW Michigan Power cogeneration
facility due to higher electricity capacity payments received under its
long-term sales contract.

                                        5
<PAGE>   8
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

The increase in Electric Power operating and joint venture income resulting from
the MCV and Michigan Power partnerships was partially offset by reduced
contributions from MCN's international power investments, specifically its
interest in the Torrent Power Limited (TPL) venture. MCN has a 40% interest in
TPL, an Indian joint venture that holds minority interests in electric
distribution companies and power generation facilities in the state of Gujarat,
India. In February 1999, MCN reached an agreement to sell its interest in TPL
for approximately $130 million, subject to certain regulatory approvals.
Earnings from TPL for 1999 have been deferred due to the pending sale that is
expected to be completed in the third quarter of 1999.

<TABLE>
<CAPTION>
                                                                 QUARTER          12 MONTHS
                                                              -------------   -----------------
                                                              1999    1998     1999      1998
                                                              -----   -----   -------   -------
<S>                                                           <C>     <C>     <C>       <C>
ELECTRIC POWER (thousands of MW hours)*
  Electricity Sales -- Domestic.............................  700.8   622.9   2,594.5   2,285.0
  Electricity Sales -- International........................     --   238.8   1,049.5     239.5
                                                              -----   -----   -------   -------
                                                              700.8   861.7   3,644.0   2,524.5
                                                              =====   =====   =======   =======
</TABLE>

* Includes MCN's share of joint ventures

ENERGY MARKETING operating and joint venture results increased $4.7 million for
both the 1999 first quarter and for the 1999 twelve-month period. Results were
impacted by an increase in total gas sales and exchange deliveries of 21.8 Bcf
and 103.9 Bcf during the 1999 first quarter and twelve-month period,
respectively. Higher costs for storage capacity as well as higher uncollectible
expense impacted both 1999 periods. The 1999 first quarter and twelve-month
period were also affected by unrealized losses associated with trading
activities (Note 2). Additionally, the current twelve-month period comparison
was impacted by the sale of Energy Marketing's 25% interest in a gas storage
project in December 1997. The storage project contributed $1.6 million of joint
venture income in the 1998 twelve-month period.

<TABLE>
<CAPTION>
                                                                 QUARTER        12 MONTHS
                                                              -------------   -------------
                                                              1999    1998    1999    1998
                                                              -----   -----   -----   -----
<S>                                                           <C>     <C>     <C>     <C>
ENERGY MARKETING (Bcf)*
  Gas Sales.................................................  138.1   115.3   477.5   370.8
  Exchange Gas Deliveries...................................    5.5     6.5    10.1    12.9
                                                              -----   -----   -----   -----
                                                              143.6   121.8   487.6   383.7
                                                              =====   =====   =====   =====
</TABLE>

* Includes MCN's share of joint ventures

As discussed in Note 2 to the Consolidated Financial Statements, MCN's
non-utility energy marketing subsidiary entered into unauthorized gas purchase
and sale contracts for trading purposes. MCN is exposed to natural gas price
risk on such contracts that have not been effectively closed, which totaled 11
Bcf at March 31, 1999. Although not likely to be significant, gains and losses
from these open contracts could impact Energy Marketing's earnings.

RISK MANAGEMENT STRATEGY -- MCN primarily manages commodity price risk by
utilizing futures, options and swap contracts to more fully balance its
portfolio of gas and oil supply and sales agreements. In late 1998, MCN began
entering into offsetting positions for existing hedges of gas and oil production
from properties that are expected to be sold in 1999. MCN's risk management
strategy is being revised to reflect the change in its business that will result
from its refocused strategic direction. Additionally, as a result of the special
investigation, MCN is taking steps to

                                        6
<PAGE>   9
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

ensure compliance with risk management policies that are periodically reviewed
by the Board of Directors.

CORPORATE & OTHER operating and joint venture results, excluding the
restructuring charges, improved $3.1 million and $.3 million for the 1999 first
quarter and twelve-month period, respectively. These improvements reflect
adjustments that reduce or eliminate accruals for employee incentive awards that
are based on MCN's operating or stock-price performance.

OTHER INCOME AND DEDUCTIONS
Other income and deductions for the 1999 first quarter and twelve-month period
reflect unfavorable changes of $20.0 million and $43.3 million, respectively.
The results for both 1999 periods reflect lower interest income, higher interest
expense and lower other income items. The reduction in interest income is due to
the collection in March 1998 of a $46 million advance made to a Philippine
independent power producer. The increase in interest expense is due to higher
borrowings primarily required to finance capital investments in the Diversified
Energy group. Other income includes $9.9 million of pre-tax gains recorded in
the 1998 first quarter from the sale of certain gas sales contracts and a 50%
interest in the 30 MW Ada cogeneration facility. Other income for the 1998
twelve-month period also reflects a $3.2 million pre-tax gain from the December
1997 sale of Diversified Energy's 25% interest in a gas storage project.

INCOME TAXES
The variations in income taxes for both 1999 periods reflect fluctuations in
pre-tax results. Income tax comparisons were also affected by tax credits and
stock-related tax benefits recorded in 1998, as well as the generation of
foreign income in 1998 that was not subject to U.S. or foreign tax provisions.

OUTLOOK
MCN's refocused strategic direction emphasizes growth through projects that
offer more predictable, long-term income streams. MCN plans to continue
investing in natural gas and gas liquid gathering, processing and transmission
facilities near areas of rapid reserve development or growing consumer markets.
MCN also intends to expand its Electric Power business, primarily in projects in
North America. Additionally, MCN will focus on expanding its Energy Marketing
coverage within existing markets as well as entering new markets through
strategic alliances with other energy providers. MCN will continue to pursue
opportunities to sell properties in order to optimize its portfolio.

Reflecting this strategy, MCN completed or advanced a number of projects during
the 1999 first quarter. These projects include the following:

Pipelines & Processing:

- The Portland Natural Gas Transmission System, in which MCN owns a 21.4%
  interest, was placed in service. This transmission system is capable of
  transporting up to 360 million cubic feet per day (MMcf/d) of gas from
  Canadian pipeline systems to New England markets.

- The Dauphin Island Gathering Partners (DIGP) partnership, in which MCN owns a
  35% interest, placed the second phase of its expansion into service, raising
  the system's throughput capacity over 60% to 1,100 MMcf/d. At the DIGP
  system's onshore terminus in Alabama,

                                        7
<PAGE>   10
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

  MCN's Mobile Bay Processing Partners joint venture, in which MCN owns a 43%
  interest, concurrently placed into service its 600 MMcf/d gas processing
  plant.

- The Blue Dolphin gathering venture, in which MCN holds a 33% interest,
  acquired the 75-mile offshore Black Marlin Pipeline located near Galveston,
  Texas that is capable of transporting up to 160 MMcf/d of gas and gas liquids.

- The Vector Pipeline project, in which MCN holds a 25% interest, and the
  Millennium Pipeline project, in which it holds a 10.5% interest, both
  progressed toward obtaining the required regulatory approvals before beginning
  construction. The Vector Pipeline project would provide a transportation link
  for up to 1,000 MMcf/d of natural gas from the Chicago supply hub to Dawn,
  Ontario. The Millennium project would complement the Vector project by
  transporting up to 700 MMcf/d of gas from Dawn to New York.

- The Volunteer Pipeline project, of which MCN owns a 33% interest, was
  announced, and an open season commenced in April 1999 offering an initial 250
  MMcf/d of transportation capacity.

- The KCI Compression Company L.P. was formed to provide a full range of natural
  gas compression services. MCN owns a 43% interest in the partnership, which
  complements its diverse energy-related businesses.

Electric Power:

- The Mobile Bay cogeneration project was placed into service concurrently with
  the Mobile Bay Processing plant. The 40 MW cogeneration project, in which MCN
  owns a 43% interest, provides electricity and thermal energy to the processing
  facility.

- The Bhote Koshi hydroelectric plant in Nepal and the Cobisa-Person power
  project in Albuquerque, N.M. proceeded with construction and are expected to
  be in service in 2000. MCN has a 65% interest in the 36 MW hydroelectric plant
  and a 95% interest in the 140 MW Cobisa-Person project.

Energy Marketing:

- Two acquisitions were completed in April 1999 that significantly increase
  Energy Marketing's level of sales to large commercial and industrial customers
  in the Midwest. In total, the acquisitions add approximately 110 Bcf or over
  20% to Energy Marketing's 1998 gas sales and exchange gas deliveries base of
  466 Bcf.

- The Washington 10 storage project, for which MCN markets 100% of the 42 Bcf of
  storage capacity, neared completion and began injecting gas into storage. The
  storage field is expected to be fully operational in time for the 1999-2000
  winter heating season.

GAS DISTRIBUTION
Results reflect earnings from new gas sales program and more favorable
weather -- The Gas Distribution segment's earnings were $84.3 million for the
1999 first quarter, an increase of $21.6 million from the comparable 1998
period. Earnings for the 1999 twelve-month period were $93.4 million, which
included $16.7 million of unusual charges. Excluding the unusual charges,
earnings for the 1999 twelve-month period were $110.1 million, an increase of
$30.2 million over the corresponding 1998 period. The earnings improvement for
the 1999 first quarter reflects contributions from the new gas sales program,
the impact of more favorable weather and an increase

                                        8
<PAGE>   11
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

in other operating revenues. The increase in earnings for the 1999 twelve-month
period reflects the impact of the gas sales program, an increase in other
operating revenues, as well as significantly lower operating expenses. These
improvements for the 1999 twelve-month period more than offset the lower gross
margins resulting from reduced gas sales and end user transportation deliveries
which were caused by warmer weather.

<TABLE>
<CAPTION>
                                                              QUARTER            12 MONTHS
                                                          ---------------   -------------------
                                                           1999     1998      1999       1998
                                                          ------   ------   --------   --------
<S>                                                       <C>      <C>      <C>        <C>
GAS DISTRIBUTION OPERATIONS (in Millions)
Operating Revenues*
  Gas sales.............................................  $443.0   $372.9   $  909.0   $  971.3
  End user transportation...............................    26.9     25.1       84.1       83.8
  Intermediate transportation...........................    14.7     18.0       60.0       58.4
  Other.................................................    25.1     19.4       73.0       58.8
                                                          ------   ------   --------   --------
                                                           509.7    435.4    1,126.1    1,172.3
Cost of Gas.............................................   255.7    220.7      497.1      555.6
                                                          ------   ------   --------   --------
Gross Margin............................................   254.0    214.7      629.0      616.7
                                                          ------   ------   --------   --------
Other Operating Expenses*
  Operation and maintenance.............................    70.5     63.1      264.0      274.6
  Depreciation, depletion and amortization..............    24.9     22.7       96.0      101.4
  Property and other taxes..............................    18.6     17.5       57.1       61.0
  Property write-down (Note 5)..........................      --       --       24.8         --
                                                          ------   ------   --------   --------
                                                           114.0    103.3      441.9      437.0
                                                          ------   ------   --------   --------
Operating Income........................................   140.0    111.4      187.1      179.7
                                                          ------   ------   --------   --------
Equity in Earnings of Joint Ventures....................      .4       .5         .9        2.0
                                                          ------   ------   --------   --------
Other Income and (Deductions)*
  Interest income.......................................     1.0      1.0        5.7        4.5
  Interest expense......................................   (13.8)   (15.4)     (55.9)     (56.2)
  Investment loss (Note 5)..............................      --       --       (8.5)        --
  Minority interest.....................................     (.3)     (.7)       6.1       (2.3)
  Other.................................................      .4       .1         .2         .4
                                                          ------   ------   --------   --------
                                                           (12.7)   (15.0)     (52.4)     (53.6)
                                                          ------   ------   --------   --------
Income Before Income Taxes..............................   127.7     96.9      135.6      128.1
Income Taxes............................................    43.4     34.2       42.2       48.2
                                                          ------   ------   --------   --------
Net Income
  Before unusual charges................................    84.3     62.7      110.1       79.9
  Unusual charges (Note 5)..............................      --       --      (16.7)        --
                                                          ------   ------   --------   --------
                                                          $ 84.3   $ 62.7   $   93.4   $   79.9
                                                          ======   ======   ========   ========
</TABLE>

* Includes intercompany transactions

GROSS MARGIN
Gas Distribution gross margin (operating revenues less cost of gas) increased
$39.3 million and $12.3 million in the 1999 first quarter and twelve-month
period, respectively, due primarily to approximately $22.5 million of margins
generated in the current quarter under MichCon's new three-year gas sales
program that began in January 1999 (Note 4a). Under the gas sales program,
MichCon's gas sales rates include a gas commodity component that is fixed at
$2.95 per thousand cubic feet (Mcf). As part of its gas acquisition strategy,
MichCon has entered into fixed-price

                                        9
<PAGE>   12
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

contracts at costs below $2.95 per Mcf for a substantial portion of its expected
gas supply requirements through 2001. This strategy is likely to produce
favorable margins in each of the three years.

Gross margins for the 1999 first quarter also reflect higher gas sales resulting
from colder weather compared to the same 1998 period. Gross margins for the
current twelve-month period reflect lower gas sales due to significantly warmer
weather. Additionally, gross margins for both 1999 periods reflect revenues from
the continued growth in other gas-related services as well as revenues from the
three heating and cooling firms acquired in October 1998.

Gas Distribution's operations are very seasonal, with gross margins and earnings
concentrated in the first and fourth quarters of each calendar year. By the end
of the first quarter, the heating season is largely over, and Gas Distribution
typically incurs substantially reduced gross margins and earnings in the second
quarter and losses in the third quarter. The seasonal nature of Gas
Distribution's operations is expected to be more pronounced as a result of
MichCon's new gas sales program.

<TABLE>
<CAPTION>
                                                               QUARTER           12 MONTHS
                                                           ---------------    ----------------
                                                           1999      1998      1999      1998
                                                           -----    ------    ------    ------
<S>                                                        <C>      <C>       <C>       <C>
EFFECT OF WEATHER ON GAS MARKETS AND EARNINGS
  Percent Colder (Warmer) Than Normal....................   (4.3)%   (18.8)%   (12.0)%    (6.9)%
  Increase (Decrease) From Normal in:
     Gas Markets (Bcf)...................................   (5.1)    (19.2)    (26.2)    (15.5)
     Net Income (in Millions)............................  $(5.1)   $(16.7)   $(23.7)   $(13.5)
     Diluted Earnings Per Share..........................  $(.06)   $ (.20)   $ (.30)   $ (.17)
</TABLE>

GAS SALES AND END USER TRANSPORTATION revenues in total increased by $71.9
million for the 1999 first quarter and decreased by $62.0 million for the 1999
twelve-month period. Revenues were affected by fluctuations in gas sales and end
user transportation deliveries that increased 12.6 Bcf in the current quarter
and decreased by 12.4 Bcf in the 1999 twelve-month period. The fluctuations in
gas sales and end user transportation deliveries were due primarily to weather,
which was 14.5% colder in the 1999 first quarter and 5.1% warmer in the current
twelve-month period compared to the corresponding 1998 periods. Revenues were
also impacted by variations in the cost of the gas commodity component of gas
sales rates. As previously discussed, this gas commodity component was fixed
under MichCon's new gas sales program at $2.95 per Mcf beginning in January
1999. Prior to 1999, MichCon's sales rates were set to recover all of its
reasonably and prudently incurred gas costs. The gas commodity component of
MichCon's sales increased $.18 per Mcf (6%) for the 1999 first quarter and
decreased $.10 per Mcf (3%) for the 1999 twelve-month period.

<TABLE>
<CAPTION>
                                                                 QUARTER        12 MONTHS
                                                              -------------   -------------
                                                              1999    1998    1999    1998
                                                              -----   -----   -----   -----
<S>                                                           <C>     <C>     <C>     <C>
GAS DISTRIBUTION MARKETS (in Bcf)
  Gas Sales.................................................   92.6    80.0   184.7   194.3
  End User Transportation...................................   42.5    42.5   140.4   143.2
                                                              -----   -----   -----   -----
                                                              135.1   122.5   325.1   337.5
  Intermediate Transportation*..............................  127.4   148.4   516.5   594.3
                                                              -----   -----   -----   -----
                                                              262.5   270.9   841.6   931.8
                                                              =====   =====   =====   =====
</TABLE>

* Includes intercompany volumes

                                       10
<PAGE>   13
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

INTERMEDIATE TRANSPORTATION revenues decreased $3.3 million in the 1999 first
quarter and increased $1.6 million in the 1999 twelve-month period. Intermediate
transportation revenues reflect lower off-system volumes of 21.0 Bcf and 77.8
Bcf in the 1999 first quarter and twelve-month period, respectively. A
significant portion of the volume decrease was for customers who pay a fixed fee
for intermediate transportation capacity regardless of actual usage. Although
volumes associated with these fixed-fee customers may vary, the related revenues
are not affected. The increase in intermediate transportation revenues for the
1999 twelve-month period is due in part to increased fees generated from
tracking the transfer of gas title on MichCon's transportation system.

OTHER OPERATING REVENUES increased $5.7 million and $14.2 million in the 1999
first quarter and twelve-month period, respectively. The improvements are due to
an increase in appliance maintenance services and other gas-related services.
Additionally, both 1999 periods reflect revenues from the acquisition of three
heating and cooling firms in October 1998.

COST OF GAS
Cost of gas is affected by variations in sales volumes and cost of purchased gas
as well as related transportation costs. Under the Gas Cost Recovery (GCR)
mechanism that was in effect through December 1998 (Note 4b), MichCon's sales
rates were set to recover all of its reasonably and prudently incurred gas
costs. Therefore, fluctuations in cost of gas sold had little effect on gross
margins. Under MichCon's new gas sales program, the gas commodity component of
its sales rates is fixed. Accordingly, beginning in January 1999, changes in
cost of gas sold directly impact gross margins and earnings.

Cost of gas sold increased $35.0 million in the 1999 first quarter and decreased
$58.5 million in the 1999 twelve-month period, primarily due to variations in
weather-driven sales volumes. Cost of gas sold was also impacted by a decrease
in prices paid of $.06 per Mcf (2%) in the 1999 first quarter and $.22 per Mcf
(8%) in the current twelve-month period.

OTHER OPERATING EXPENSES
OPERATION AND MAINTENANCE expenses increased $7.4 million in the 1999 first
quarter and decreased $10.6 million in the 1999 twelve-month period. The
increase in the 1999 quarter is due in part to additional computer system costs
as well as advertising costs associated with MichCon's new gas sales program,
partially offset by lower uncollectible gas accounts expense. The decrease in
the 1999 twelve-month period reflects lower employee benefit costs, primarily
pension and retiree healthcare costs, as well as lower uncollectible gas
accounts expense. Additionally, both 1998 periods benefited from an interstate
pipeline company refund.

DEPRECIATION AND DEPLETION increased $2.2 million in the 1999 first quarter and
decreased $5.4 million in the 1999 twelve-month period. Depreciation on higher
plant balances impacted both 1999 periods. Additionally, the twelve-month period
comparison reflects the effect of lower depreciation rates for MichCon's utility
property, plant and equipment that became effective in January 1998.

PROPERTY AND OTHER TAXES increased $1.1 million in the 1999 first quarter and
decreased $3.9 million in the 1999 twelve-month period. The current quarter
increase reflects higher Michigan Single Business Tax resulting from an increase
in taxable income as well as higher property taxes due to an

                                       11
<PAGE>   14
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

increase in plant balances. The decrease in the 1999 twelve-month period is
attributable to lower Michigan Single Business Tax.

PROPERTY WRITE-DOWN of $24.8 million in the 1999 twelve-month period reflects
the impairment of a Michigan gas gathering system (Note 5).

EQUITY IN EARNINGS OF JOINT VENTURES
Equity in earnings of joint ventures decreased $1.1 million in the 1999
twelve-month period due to increased losses from Gas Distribution's 47.5%
interest in a Missouri gas distribution company that is expected to be sold in
1999.

OTHER INCOME AND DEDUCTIONS
Other income and deductions decreased $2.3 million in the 1999 first quarter and
$1.2 million in the current twelve-month period. Both 1999 periods were impacted
by lower interest costs primarily due to a decrease in the average interest rate
on borrowings. Other income and deductions in the 1999 twelve-month period also
reflect an unusual charge to write down the investment in a small natural-gas
distribution company located in Missouri. Also impacting other income and
deductions in the 1999 twelve-month period was a change in minority interest
reflecting the joint venture partners' share of the write-down of certain
Michigan gas gathering properties (Note 5).

INCOME TAXES
Income taxes for both 1999 periods were impacted by an increase in pre-tax
earnings. Income tax comparisons were also affected by the favorable resolution
of prior years' tax issues in the 1999 first quarter. Additionally,
stock-related tax benefits were recorded in 1998 as well as a provision for tax
issues.

OUTLOOK
Gas Distribution's strategy is to aggressively expand its role as the preferred
provider of natural gas and high-value energy services within Michigan.
Accordingly, Gas Distribution's objectives are to increase revenues and control
costs in order to deliver strong shareholder returns and provide customers with
high-quality service at competitive prices.

Gas Distribution has begun and plans to continue capitalizing on opportunities
resulting from the gas industry restructuring. MichCon is currently implementing
its Regulatory Reform Plan, which includes a comprehensive experimental
three-year customer choice program that is designed to offer all sales customers
added choices and greater price certainty. Beginning April 1, 1999, a limited
number of customers have the option of purchasing natural gas from suppliers
other than MichCon. However, MichCon will continue to transport and deliver the
gas to the customers' premises at prices that maintain its previously existing
sales margins. The Plan also suspended the GCR mechanism for customers who
continue to purchase gas from MichCon and fixed the gas commodity component of
MichCon's sales rates at $2.95 per Mcf for the three-year period that began in
January 1999. The suspension of the GCR mechanism allows MichCon to profit from
its ability to purchase gas at less than $2.95 per Mcf. Also beginning in 1999,
an income sharing mechanism allows customers to share in profits when actual
return on equity from utility operations exceeds predetermined thresholds.

                                       12
<PAGE>   15
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

Gas Distribution also plans to grow revenues and earnings by offering a variety
of energy-related services, which include appliance maintenance. Growth in
revenues is expected from the three heating and cooling firms acquired in
October 1998 that have been integrated under MichCon Home Services, which is
expanding its customer base and range of services.

DISCONTINUED OPERATIONS
-----------------------
As part of its refocused strategic direction announced in late 1998, MCN decided
to sell its E&P properties and has classified this segment as a discontinued
operation. MCN completed the sale of the western U.S. portion of its E&P
properties in April 1999 for approximately $165 million. In May 1999, MCN
reached an agreement to sell its Midcontinent/Gulf Coast properties. Bids on all
remaining properties have been received and the properties are expected to be
sold in mid-1999. E&P operating results for 1999 will be deferred until the
sales of such properties have been completed. E&P had losses of $274.7 million
in the 1999 twelve-month period and income of $1.9 million and $22.1 million in
the 1998 first quarter and twelve-month period, respectively. The 1999
twelve-month period included a total of $275.0 million of write-downs (Note 6).

CHANGES IN ACCOUNTING
-----------------------------
In the 1999 first quarter, MCN adopted Statement of Position (SOP) 98-5,
"Reporting on the Costs of Start-up Activities" issued by the Accounting
Standards Executive Committee of the American Institute of Certified Public
Accountants. SOP 98-5 requires start-up and organizational costs to be expensed
as incurred. This change in accounting principle resulted in the write-off of
start-up and organization costs capitalized as of December 31, 1998. The
cumulative effect of the change was to decrease earnings by $2.9 million for the
1999 first quarter and twelve-month period.

In the 1999 first quarter, MCN adopted the Emerging Issues Task Force consensus
on Issue No. 98-10, "Accounting for Energy Trading and Risk Management
Activities" (EITF 98-10). EITF 98-10 requires all energy trading contracts to be
recognized in the balance sheet as either assets or liabilities measured at
their fair value, with changes in fair value recognized in earnings. Adoption of
EITF 98-10 did not have a material impact on MCN's financial statements.

CAPITAL RESOURCES AND LIQUIDITY

<TABLE>
<CAPTION>
                                                                   QUARTER
                                                              -----------------
                                                               1999      1998
                                                              -------   -------
<S>                                                           <C>       <C>
CASH AND CASH EQUIVALENTS (in Millions)
Cash Flow Provided From (Used For):
  Operating activities......................................  $ 202.9   $ 155.2
  Financing activities......................................   (100.2)    (40.8)
  Investing activities......................................    (84.9)   (114.2)
                                                              -------   -------
Net Increase in Cash and Cash Equivalents...................  $  17.8   $    .2
                                                              =======   =======
</TABLE>

OPERATING ACTIVITIES
-------------------------
MCN's cash flow from operating activities increased $47.7 million during the
1999 first quarter as compared to the same 1998 period. The increase was due
primarily to higher earnings, after adjusting for non-cash items (depreciation,
change in accounting and deferred taxes).

                                       13
<PAGE>   16
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

FINANCING ACTIVITIES
-------------------------
MCN's cash flow used for financing activities increased $59.4 million during the
1999 first quarter. The change primarily reflects lower debt and equity
issuances, net of debt repayments, in the 1999 quarter compared to the same 1998
period. Proceeds from the expected sale of MCN's E&P properties in mid-1999 will
be used to repay commercial paper and bank borrowings. A summary of MCN's
significant financing activities and financing plans during 1999 follows.

Prior to mid-February 1999, MCN issued new shares of common stock pursuant to
its Dividend Reinvestment and Stock Purchase Plan and various employee benefit
plans. MCN generated $.2 million in the 1999 first quarter and $5.6 million in
the 1998 first quarter from common stock issuances under these plans. Beginning
in mid-February 1999, shares issued under these plans are being acquired by MCN
through open market purchases.

MCN's 5,865,000 of Preferred Redeemable Increased Dividend Equity Securities
(Enhanced PRIDES) matured in April 1999. Each security represented a contract to
purchase one share of MCN common stock. Upon conversion of the Enhanced PRIDES,
MCN received cash proceeds totaling approximately $135.0 million. The proceeds
were used to repay a $130.0 million medium-term note of Diversified Energy that
came due in May 1999.

In March 1999, MCN entered into a $150 million revolving credit agreement that
expires in October 1999. Borrowings under the credit agreement will be used to
fund capital investments and for general corporate purposes. There were no
amounts outstanding under this credit agreement as of March 31, 1999.

DIVERSIFIED ENERGY
The Diversified Energy group maintains credit lines that allow for borrowings of
up to $200 million under a 364-day revolving credit facility and up to $200
million under a three-year revolving credit facility. These facilities support
Diversified Energy's commercial paper program, which is used to finance capital
investments and to finance Energy Marketing's working capital requirements.
During the first three months of 1999, Diversified Energy's commercial paper and
bank borrowings outstanding increased by $143.5 million, leaving borrowings of
$368.8 million outstanding under this program at March 31, 1999.

MCN received approximately $165 million in April 1999 from the sale of its
western E&P properties. Proceeds from the sale were used to repay outstanding
debt at the MCN Corporate and Diversified Energy levels. Proceeds from the sale
of additional E&P properties are expected in mid-1999 and will be used to repay
outstanding borrowings and for general corporate purposes.

MCN repaid $80 million of medium-term notes and $130 million of medium-term
notes that came due in February 1999 and May 1999, respectively.

GAS DISTRIBUTION
Cash and cash equivalents normally increase and short-term debt is reduced in
the first part of each year as gas inventories are depleted and funds are
received from winter heating sales. During the latter part of the year, cash and
cash equivalents normally decrease as funds are used to finance increases in gas
inventories and customer accounts receivable. To meet its seasonal short-term
borrowing needs, MichCon normally issues commercial paper that is backed by
credit lines with several banks. MichCon has established credit lines that allow
for borrowings of up to $150 million

                                       14
<PAGE>   17
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

under a 364-day revolving credit facility and up to $150 million under a
three-year revolving credit facility. During the first three months of 1999,
MichCon repaid $113.3 million of commercial paper, leaving borrowings of $106.6
million outstanding under this program at March 31, 1999.

During the 1999 second quarter, MichCon anticipates issuing approximately $110
million of debt. MichCon repaid $20 million of first mortgage bonds that matured
in May 1999 and $30 million of first mortgage bonds that matured in June 1999.

INVESTING ACTIVITIES
------------------------
MCN's cash used for investing activities decreased $29.3 million in the 1999
first quarter as compared to the same 1998 period. The decrease was due
primarily to lower capital investments and proceeds from the sale of property
and investments.

Capital investments equaled $132.9 million in the 1999 first quarter compared to
$194.1 million for the same period in 1998. The 1999 investments include
significantly lower levels of investments in E&P properties and gas distribution
facilities.

<TABLE>
<CAPTION>
                                                                  QUARTER
                                                              ---------------
                                                               1999     1998
                                                              ------   ------
<S>                                                           <C>      <C>
CAPITAL INVESTMENTS (in Millions)
Consolidated Capital Expenditures:
  Diversified Energy........................................  $ 17.7   $ 17.1
  Gas Distribution..........................................    24.4     38.5
  Discontinued Operations...................................    39.2     64.9
                                                              ------   ------
                                                                81.3    120.5
                                                              ------   ------
MCN's Share of Joint Venture Capital Expenditures:*
  Pipelines & Processing....................................    39.8     37.0
  Energy Marketing, Gas Storage & Electric Power............     6.8      1.5
  Other.....................................................      --       .2
                                                              ------   ------
                                                                46.6     38.7
                                                              ------   ------
Acquisitions................................................     5.0     34.9
                                                              ------   ------
Total Capital Investments...................................  $132.9   $194.1
                                                              ======   ======
</TABLE>

* A portion of joint venture capital expenditures is financed with joint venture
  debt

Total capital investments were partially funded from the sale of certain E&P
properties and joint venture investments that totaled $29.0 million in the 1999
first quarter.

OUTLOOK
----------
1999 capital investments to range between $650 million and $750 million -- MCN's
strategic direction is to grow by investing in a diverse portfolio of
energy-related projects. For 1999, MCN anticipates investing between $650
million and $750 million, of which 80% is expected to be within the Diversified
Energy group.

The proposed level of investments for 1999 and future years could increase
capital requirements materially in excess of internally generated funds and
require the issuance of additional debt and equity securities. MCN's external
capital requirements will also depend on proceeds received from the sale of
assets. General market conditions will also dictate the timing and amount of
future

                                       15
<PAGE>   18
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

issuances. It is management's opinion that MCN and its subsidiaries will have
sufficient capital resources, both internal and external, to meet anticipated
capital and operating requirements.

YEAR 2000

As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN has implemented a
corporate-wide, four-phase Year 2000 approach consisting of: i)
inventory -- identification of the components of MCN's systems, equipment and
facilities; ii) assessment -- assessing Year 2000 readiness and prioritizing the
risks of items identified in the inventory phase; iii) remediation -- upgrading,
repairing and replacing non-compliant systems, equipment and facilities; and iv)
testing -- verifying items remediated. MCN is generally on schedule to have its
mission critical business systems, and measurement and control systems
(including embedded microprocessors) Year 2000 ready as detailed below. The
extension of the program to September 1999 reflects MCN's determination that
additional testing and remediation is appropriate for some critical business and
control systems for both MCN and its partners and vendors. The estimated
completion status of these systems and the projected status for the future
follows:

<TABLE>
<CAPTION>
                                                Inventory   Assessment   Remediation   Testing
                                                ---------   ----------   -----------   -------
<S>                                             <C>         <C>          <C>           <C>
Business Systems:
  March 31, 1999..............................    100%         100%          80%         45%
  June 30, 1999...............................    100%         100%          95%         85%
  September 30, 1999..........................    100%         100%         100%        100%
Measurement and Control Systems:
  March 31, 1999..............................     98%          98%          93%         88%
  June 30, 1999...............................    100%         100%          98%         98%
  September 30, 1999..........................    100%         100%         100%        100%
</TABLE>

Costs associated with the Year 2000 issue are not expected to have a material
adverse effect on MCN results of operation, liquidity and financial condition.
The total costs are estimated to be between $5 million and $6 million of which
approximately $3.9 million was incurred through March 1999. This estimate does
not include MCN's share of Year 2000 costs that may be incurred by partnerships
and joint ventures. The anticipated costs are not higher due in part to the
ongoing replacement of significant old systems. New systems in process of being
installed, as well as those installed over the past few years, are Year 2000
ready. These systems were necessary to maintain a high level of customer
satisfaction and to respond to changes in regulation and increased competition
within the energy industry.

MCN anticipates a smooth transition to the Year 2000. However, the failure to
correct a material Year 2000 problem could result in an interruption in or a
failure of certain business activities and operations. Such interruptions or
failures could have a material adverse effect on MCN's results of operations,
liquidity and financial condition. Due to the uncertainty inherent in the Year
2000 issue, resulting in part from the uncertainty of the Year 2000 readiness of
key partners, operators, suppliers and government agencies, MCN cannot certify
that it will be unaffected by Year 2000 complications.

In order to reduce its Year 2000 risk, MCN is developing contingency plans for
mission-critical processes in the event of a Year 2000 complication. Contingency
plans for several essential gas transmission facilities continue to be tested
under a "power outage" scenario and have achieved

                                       16
<PAGE>   19
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Continued)

excellent results. Contingency plans will continue to be refined throughout 1999
as MCN works with partners, operators, suppliers and governmental agencies.

MARKET RISK INFORMATION

As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN manages commodity
price and interest rate risk through the use of various derivative instruments
and limits the use of such instruments to hedging activities. A discussion and
analysis of the events and factors that have changed MCN's commodity price,
interest rate and foreign currency risk during the 1999 first quarter follows.

COMMODITY PRICE RISK
-----------------------------
Natural gas and oil futures, options and swap agreements are used to manage
Diversified Energy's exposure to the risk of market price fluctuations on gas
sale and purchase contracts, gas and oil production and gas inventories. MCN is
entering into offsetting positions for existing hedges of E&P's gas and oil
production from properties that are expected to be sold in 1999. As a result of
entering into the offsetting positions, as well as changes in commodity prices
that occurred during the 1999 first quarter, there have been material changes in
the outcome of the sensitivity analysis performed for commodity price risk at
March 31, 1999 as compared to December 31, 1998.

As discussed in MCN's 1998 Annual Report on Form 10-K/A, a sensitivity analysis
calculates the change in fair values of MCN's natural gas and oil futures and
swap agreements given a hypothetical 10% increase or decrease in commodity
prices utilizing applicable forward commodity rates in effect at the end of the
reporting period.

The results of the sensitivity analysis calculations follow:

<TABLE>
<CAPTION>
                                                 MARCH 31, 1999             DECEMBER 31, 1998
                                            -------------------------   -------------------------
                                             ASSUMING      ASSUMING      ASSUMING      ASSUMING
                                               A 10%         A 10%         A 10%         A 10%
                                            INCREASE IN   DECREASE IN   INCREASE IN   DECREASE IN
                                             COMMODITY     COMMODITY     COMMODITY     COMMODITY
                                              PRICES        PRICES        PRICES        PRICES
(in Millions)                               -----------   -----------   -----------   -----------
<S>                                         <C>           <C>           <C>           <C>
Commodity Price Sensitive:*
Swaps: Pay fixed/receive variable.........    $ 77.5        $(77.5)       $ 53.6        $(53.6)
        Pay variable/receive fixed........    $(67.0)       $ 67.0        $(54.0)       $ 54.0
Futures: Longs............................    $   .5        $  (.5)       $  1.9        $ (1.9)
         Shorts...........................    $ (8.1)       $  8.1        $  (.1)       $   .1
</TABLE>

* Includes only the risk related to the derivative instruments that serve as
  hedges and does not include the related underlying hedged item.

As discussed in Note 2 to the Consolidated Financial Statements, MCN's
non-utility energy marketing subsidiary entered into unauthorized gas purchase
and sale contracts for trading purposes. MCN is exposed to natural gas price
risk on such contracts that have not been effectively closed that totaled 11 Bcf
at March 31, 1999 and 44 Bcf at December 31, 1998. A 10% unfavorable change in
basis would have reduced the fair value of such open contracts by $.2 million at
March 31, 1999 and by $1.2 million at December 31, 1998. A 10% favorable change
in basis would have increased the fair value of such contracts by corresponding
amounts for the March 31, 1999 and December 31, 1998 periods.

                                       17
<PAGE>   20
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
          OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (Concluded)

INTEREST RATE RISK
-----------------------
MCN is subject to interest rate risk in connection with the issuance of variable
and fixed-rate debt and preferred securities. In order to manage interest costs
and risk, MCN uses interest rate swap agreements to exchange fixed and
variable-rate interest payment obligations over the life of the agreements
without exchange of the underlying principal amounts. During the 1999 first
quarter, there have not been any events or factors that have caused any material
changes to MCN's interest rate risk.

FOREIGN CURRENCY RISK
MCN is subject to foreign currency risk as a result of its investments in
foreign joint ventures, which are primarily located in India. During the 1999
first quarter, MCN reached an agreement to sell its interest in TPL for
approximately $130 million. The sale is subject to certain regulatory approvals
and is expected to be completed in the third quarter of 1999. This sale will
significantly reduce MCN's foreign currency risk.

NEW ACCOUNTING PRONOUNCEMENTS

Derivative and Hedging Activities -- In June 1998, the Financial Accounting
Standards Board issued Statement of Financial Accounting Standards (SFAS) No.
133, "Accounting for Derivative Instruments and Hedging Activities," effective
for fiscal years beginning after June 15, 1999. SFAS No. 133 requires all
derivatives to be recognized in the balance sheet as either assets or
liabilities measured at their fair value and sets forth conditions in which a
derivative instrument may be designated as a hedge. The Statement requires that
changes in the fair value of derivatives be recognized currently in earnings
unless specific hedge accounting criteria are met. Special accounting for
qualifying hedges allows a derivative's gains and losses to be recorded to other
comprehensive income or to offset related results on the hedged item in
earnings.

MCN manages commodity price risk and interest rate risk through the use of
various derivative instruments and predominantly limits the use of such
instruments to hedging activities. The effects of SFAS No. 133 on MCN's
financial statements are subject to fluctuations in the market value of hedging
contracts which are, in turn, affected by variations in gas and oil prices and
in interest rates. Accordingly, management cannot quantify the effects of
adopting SFAS No. 133 at this time.

FORWARD-LOOKING STATEMENTS

The Quarterly Report on Form 10-Q/A includes forward-looking statements within
the meaning of the Private Securities Litigation Reform Act of 1995.
Forward-looking statements involve certain risks and uncertainties as set forth
in MCN's 1998 Annual Report on Form 10-K/A.

The Year 2000 disclosure is a Year 2000 Readiness Disclosure under the Year 2000
Information and Readiness Disclosure Act. Therefore, MCN claims the full
protections established by the Act.

AVAILABLE INFORMATION

The following information is available without charge to shareholders and other
interested parties: the Form 10-K/A Annual Report; the Form 10-Q Quarterly
Reports and the Annual and Quarterly Statistical Supplements. To request these
publications, shareholders and other interested parties are instructed to
contact: MCN Investor Relations, 500 Griswold Street, Detroit, Michigan 48226,
(800) 548-4655. Information is also available on MCN's website at
http://www.mcnenergy.com.

                                       18
<PAGE>   21

                     MCN ENERGY GROUP INC. AND SUBSIDIARIES

                CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               THREE MONTHS ENDED       TWELVE MONTHS ENDED
                                                                    MARCH 31,                MARCH 31,
                                                              ---------------------   -----------------------
                                                                            1998                      1998
                                                                         (Restated)                (Restated)
                                                                1999       NOTE 2        1999        Note 2
(in Thousands, Except Per Share Amounts)                      --------   ----------   ----------   ----------
<S>                                                           <C>        <C>          <C>          <C>
OPERATING REVENUES..........................................  $767,672    $658,584    $1,989,282   $1,968,690
                                                              --------    --------    ----------   ----------
OPERATING EXPENSES
  Cost of gas...............................................   494,019     437,032     1,319,359    1,326,395
  Operation and maintenance.................................    82,241      71,353       312,849      305,080
  Depreciation, depletion and amortization..................    26,319      23,754       101,479      104,991
  Property and other taxes..................................    19,226      18,552        60,177       63,035
  Property write-downs and restructuring charges (Note 5)...        --          --       175,341           --
                                                              --------    --------    ----------   ----------
                                                               621,805     550,691     1,969,205    1,799,501
                                                              --------    --------    ----------   ----------
OPERATING INCOME............................................   145,867     107,893        20,077      169,189
                                                              --------    --------    ----------   ----------
EQUITY IN EARNINGS OF JOINT VENTURES........................    12,458      16,761        57,922       56,159
                                                              --------    --------    ----------   ----------
OTHER INCOME AND (DEDUCTIONS)
  Interest income...........................................     1,375       4,210         7,632       13,019
  Interest on long-term debt................................   (16,505)    (13,160)      (63,988)     (55,977)
  Other interest expense....................................    (5,591)     (5,063)      (19,334)     (10,244)
  Dividends on preferred securities of subsidiaries.........    (4,972)     (5,209)      (17,376)     (17,993)
  Investment loss (Note 5)..................................        --          --        (8,500)          --
  Minority interest.........................................      (319)       (610)        6,283       (2,221)
  Other.....................................................     1,320      12,696           222       20,473
                                                              --------    --------    ----------   ----------
                                                               (24,692)     (7,136)      (95,061)     (52,943)
                                                              --------    --------    ----------   ----------
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME
  TAXES.....................................................   133,633     117,518       (17,062)     172,405
INCOME TAX PROVISION (BENEFIT)..............................    45,218      40,578       (14,860)      62,280
                                                              --------    --------    ----------   ----------
INCOME FROM CONTINUING OPERATIONS...........................    88,415      76,940        (2,202)     110,125
DISCONTINUED OPERATIONS, NET OF TAXES (NOTE 6)..............        --       1,942      (274,733)      22,067
                                                              --------    --------    ----------   ----------
INCOME (LOSS) BEFORE CUMULATIVE EFFECT OF ACCOUNTING
  CHANGE....................................................    88,415      78,882      (276,935)     132,192
(CUMULATIVE EFFECT OF ACCOUNTING CHANGE, NET OF TAXES
NOTE 3).....................................................    (2,872)         --        (2,872)          --
                                                              --------    --------    ----------   ----------
NET INCOME (LOSS)...........................................  $ 85,543    $ 78,882    $ (279,807)  $  132,192
                                                              ========    ========    ==========   ==========
BASIC EARNINGS (LOSS) PER SHARE (NOTE 10)
  Continuing operations.....................................  $   1.11    $    .98    $     (.03)  $     1.46
  Discontinued operations (Note 6)..........................        --         .03         (3.47)         .29
  Cumulative effect of accounting change (Note 3)...........      (.04)         --          (.04)          --
                                                              --------    --------    ----------   ----------
                                                              $   1.07    $   1.01    $    (3.54)  $     1.75
                                                              ========    ========    ==========   ==========
DILUTED EARNINGS (LOSS) PER SHARE (NOTE 10)
  Continuing operations.....................................  $   1.06    $    .93    $     (.03)  $     1.43
  Discontinued operations (Note 6)..........................        --         .02         (3.47)         .27
  Cumulative effect of accounting change (Note 3)...........      (.04)         --          (.04)          --
                                                              --------    --------    ----------   ----------
                                                              $   1.02    $    .95    $    (3.54)  $     1.70
                                                              ========    ========    ==========   ==========
AVERAGE COMMON SHARES OUTSTANDING
  Basic.....................................................    79,413      78,365        79,081       75,658
                                                              ========    ========    ==========   ==========
  Diluted...................................................    85,064      84,504        79,081       81,439
                                                              ========    ========    ==========   ==========
DIVIDENDS DECLARED PER SHARE................................  $  .2550    $  .2550    $   1.0200   $    .9950
                                                              ========    ========    ==========   ==========
-------------------------------------------------------------------------------------------------------------
</TABLE>

       CONSOLIDATED STATEMENT OF RETAINED EARNINGS (DEFICIT) (Unaudited)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               THREE MONTHS ENDED     TWELVE MONTHS ENDED
                                                                   MARCH 31,               MARCH 31,
                                                              --------------------   ----------------------
                                                                           1998                     1998
                                                                        (Restated)               (Restated)
                                                               1999       NOTE 2       1999        Note 2
(in Thousands)                                                -------   ----------   ---------   ----------
<S>                                                           <C>       <C>          <C>         <C>
BALANCE -- BEGINNING OF PERIOD..............................  $(2,977)   $365,730    $ 424,157    $368,511
ADD -- NET INCOME (LOSS)....................................   85,543      78,882     (279,807)    132,192
                                                              -------    --------    ---------    --------
                                                               82,566     444,612      144,350     500,703
DEDUCT -- CASH DIVIDENDS DECLARED...........................   19,791      20,455       81,575      76,546
                                                              -------    --------    ---------    --------
BALANCE -- END OF PERIOD....................................  $62,775    $424,157    $  62,775    $424,157
                                                              =======    ========    =========    ========
-----------------------------------------------------------------------------------------------------------
</TABLE>

The notes to the consolidated financial statements are an integral part of these
statements.

                                       19
<PAGE>   22

                     MCN ENERGY GROUP INC. AND SUBSIDIARIES

            CONSOLIDATED STATEMENT OF FINANCIAL POSITION (Unaudited)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       MARCH 31,            DECEMBER 31,
                                                                ------------------------    ------------
                                                                                 1998           1998
                                                                              (Restated)     (Restated)
                                                                   1999         Note 2         Note 2
(in Thousands)                                                  ----------    ----------    ------------
<S>                                                             <C>           <C>           <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents, at cost (which approximates
    market value)...........................................    $   34,833    $  39,713      $   17,039
  Accounts receivable, less allowance for doubtful accounts
    of $13,411, $18,661 and $9,655, respectively............       431,783      434,541         400,120
  Accrued unbilled revenues.................................        77,335       64,246          87,888
  Gas in inventory (Note 7).................................        90,122       65,112         147,387
  Property taxes assessed applicable to future periods......        63,064       56,726          72,551
  Other.....................................................        50,062       62,675          42,472
                                                                ----------    ----------     ----------
                                                                   747,199      723,013         767,457
                                                                ----------    ----------     ----------
DEFERRED CHARGES AND OTHER ASSETS
  Deferred income taxes.....................................        29,054           --          50,547
  Investments in debt and equity securities.................        68,920       49,986          69,705
  Deferred swap losses and receivables (Note 13)............        48,510       67,053          63,147
  Deferred environmental costs..............................        31,056       30,351          30,773
  Prepaid benefit costs.....................................       122,061       79,869         111,775
  Other.....................................................       107,511       82,307          98,940
                                                                ----------    ----------     ----------
                                                                   407,112      309,566         424,887
                                                                ----------    ----------     ----------
INVESTMENTS IN AND ADVANCES TO JOINT VENTURES
  Pipelines & Processing....................................       543,709      359,051         521,711
  Electric Power............................................       242,491      195,441         231,668
  Energy Marketing..........................................        29,888       23,441          29,435
  Gas Distribution (Note 5).................................         1,628        8,906           1,478
  Other.....................................................        18,632       18,916          18,939
                                                                ----------    ----------     ----------
                                                                   836,348      605,755         803,231
                                                                ----------    ----------     ----------
PROPERTY, PLANT AND EQUIPMENT
  Pipelines & Processing (Note 5)...........................        45,771       61,670          48,706
  Gas Distribution (Note 5).................................     2,938,831    2,832,622       2,916,540
  Exploration & Production (Note 6).........................     1,051,512    1,363,663       1,040,047
  Other.....................................................        49,446       29,304          36,124
                                                                ----------    ----------     ----------
                                                                 4,085,560    4,287,259       4,041,417
  Less -- Accumulated depreciation and depletion............     1,688,538    1,520,994       1,644,094
                                                                ----------    ----------     ----------
                                                                 2,397,022    2,766,265       2,397,323
                                                                ----------    ----------     ----------
                                                                $4,387,681    $4,404,599     $4,392,898
                                                                ==========    ==========     ==========
--------------------------------------------------------------------------------------------------------
</TABLE>

The notes to the consolidated financial statements are an integral part of this
statement.

                                       20
<PAGE>   23

                     MCN ENERGY GROUP INC. AND SUBSIDIARIES

            CONSOLIDATED STATEMENT OF FINANCIAL POSITION (Unaudited)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       MARCH 31,            DECEMBER 31,
                                                                ------------------------    ------------
                                                                                 1998           1998
                                                                              (Restated)     (Restated)
                                                                   1999         Note 2         Note 2
(in Thousands)                                                  ----------    ----------    ------------
<S>                                                             <C>           <C>           <C>
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
  Accounts payable..........................................    $  258,366    $ 283,600      $  304,349
  Notes payable.............................................       534,639      172,751         618,851
  Current portion of long-term debt and capital lease
    obligations.............................................       188,427       29,538         269,721
  Gas inventory equalization (Note 7).......................        79,559       70,900              --
  Federal income, property and other taxes payable..........        89,734       90,090          69,465
  Deferred gas cost recovery revenues (Note 4b).............            --       18,937          14,980
  Gas payable...............................................        37,515       21,232          42,669
  Customer deposits.........................................        17,476       15,343          18,791
  Other.....................................................        98,450       79,496         108,310
                                                                ----------    ----------     ----------
                                                                 1,304,166      781,887       1,447,136
                                                                ----------    ----------     ----------
DEFERRED CREDITS AND OTHER LIABILITIES
  Deferred income taxes.....................................            --      163,686              --
  Unamortized investment tax credit.........................        29,569       32,577          30,056
  Tax benefits amortizable to customers.....................       129,494      123,189         130,120
  Deferred swap gains and payables (Note 13)................        51,605       49,216          62,956
  Accrued environmental costs...............................        34,888       35,000          35,000
  Minority interest.........................................        10,405       20,276          10,898
  Other.....................................................        77,623       69,105          75,439
                                                                ----------    ----------     ----------
                                                                   333,584      493,049         344,469
                                                                ----------    ----------     ----------
LONG-TERM DEBT, including capital lease obligations (Note
  9)........................................................     1,392,850    1,415,494       1,307,168
                                                                ----------    ----------     ----------
MCN-OBLIGATED MANDATORILY REDEEMABLE PREFERRED SECURITIES OF
  SUBSIDIARIES HOLDING SOLELY DEBENTURES OF MCN.............       502,157      504,869         502,203
                                                                ----------    ----------     ----------
CONTINGENCIES (Note 12)
COMMON SHAREHOLDERS' EQUITY
  Common stock..............................................           798          788             797
  Additional paid-in capital................................       830,450      815,364         832,966
  Retained earnings.........................................        62,775      424,157          (2,977)
  Accumulated other comprehensive loss (Note 11)............       (16,811)      (9,085)        (16,576)
  Yield enhancement, contract and issuance costs............       (22,288)     (21,924)        (22,288)
                                                                ----------    ----------     ----------
                                                                   854,924    1,209,300         791,922
                                                                ----------    ----------     ----------
                                                                $4,387,681    $4,404,599     $4,392,898
                                                                ==========    ==========     ==========
--------------------------------------------------------------------------------------------------------
</TABLE>

The notes to the consolidated financial statements are an integral part of this
statement.

                                       21
<PAGE>   24

                     MCN ENERGY GROUP INC. AND SUBSIDIARIES

                CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED
                                                                    MARCH 31,
                                                              ----------------------
                                                                             1998
                                                                          (Restated)
                                                                1999        Note 2
(in Thousands)                                                ---------   ----------
<S>                                                           <C>         <C>
CASH FLOW FROM OPERATING ACTIVITIES
  Net income................................................  $  85,543   $  78,882
  Adjustments to reconcile net income to net cash provided
    from operating activities
    Depreciation, depletion and amortization
      Per statement of operations...........................     26,319      23,754
      Charged to discontinued operations and other
       accounts.............................................     21,035      23,090
    Cumulative effect of accounting change (Note 3).........      2,872          --
    Deferred income taxes -- current........................     (5,489)     (8,822)
    Deferred income taxes and investment tax credit, net....     22,495      10,151
    Equity in earnings of joint ventures, net of
     distributions..........................................     (3,390)     (8,670)
    Other...................................................     (1,138)        622
    Changes in assets and liabilities, exclusive of changes
     shown separately.......................................     54,622      36,217
                                                              ---------   ---------
      Net cash provided from operating activities...........    202,869     155,224
                                                              ---------   ---------
CASH FLOW FROM FINANCING ACTIVITIES
  Notes payable, net........................................    (84,212)   (138,618)
  Dividends paid............................................    (19,791)    (20,455)
  Issuance of common stock..................................        226       5,584
  Reacquisition of common stock.............................       (977)         --
  Issuance of long-term debt................................         --     204,609
  Long-term commercial paper and bank borrowings............     92,344     (90,357)
  Retirement of long-term debt and preferred securities
    (Note 9)................................................    (87,781)     (5,181)
  Other.....................................................         --       3,634
                                                              ---------   ---------
      Net cash used for financing activities................   (100,191)    (40,784)
                                                              ---------   ---------
CASH FLOW FROM INVESTING ACTIVITIES
  Capital expenditures......................................    (81,320)   (120,503)
  Acquisitions..............................................     (1,602)    (13,232)
  Investment in debt and equity securities, net.............        (12)     46,468
  Investment in joint ventures..............................    (27,648)    (37,810)
  Sale of property and joint venture interests..............     28,986       9,147
  Return of investment in joint ventures....................      1,136       2,591
  Other.....................................................     (4,424)       (883)
                                                              ---------   ---------
      Net cash used for investing activities................    (84,884)   (114,222)
                                                              ---------   ---------
NET INCREASE IN CASH AND CASH EQUIVALENTS...................     17,794         218
CASH AND CASH EQUIVALENTS, JANUARY 1........................     17,039      39,495
                                                              ---------   ---------
CASH AND CASH EQUIVALENTS, MARCH 31.........................  $  34,833   $  39,713
                                                              =========   =========
CHANGES IN ASSETS AND LIABILITIES, EXCLUSIVE OF CHANGES
  SHOWN SEPARATELY
  Accounts receivable, net..................................  $ (32,348)  $ (30,077)
  Accrued unbilled revenues.................................     10,553      28,764
  Accrued/deferred gas cost recovery revenues, net..........    (14,980)     31,799
  Gas in inventory..........................................     57,265      (8,335)
  Accounts payable..........................................    (41,183)    (58,595)
  Federal income, property and other taxes payable..........     20,269       3,264
  Gas payable...............................................     (5,154)     12,915
  Gas inventory equalization................................     79,559      70,900
  Prepaid/accrued benefit costs, net........................     (9,678)      1,024
  Other current assets and liabilities, net.................     (5,402)    (11,784)
  Deferred assets and liabilities, net......................     (4,279)     (3,658)
                                                              ---------   ---------
                                                              $  54,622   $  36,217
                                                              =========   =========
SUPPLEMENTAL DISCLOSURES
  Cash paid during the year for:
    Interest, net of amounts capitalized....................  $  34,673   $  37,344
    Federal income taxes....................................  $      --   $   1,500
</TABLE>

--------------------------------------------------------------------------------
The notes to the consolidated financial statements are an integral part of this
statement.

                                       22
<PAGE>   25

                     MCN ENERGY GROUP INC. AND SUBSIDIARIES
                 NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1. GENERAL

The accompanying consolidated financial statements should be read in conjunction
with MCN's 1998 Annual Report on Form 10-K/A. Certain reclassifications have
been made to the prior year's financial statements to conform with the 1999
presentation. In the opinion of management, the unaudited information furnished
herein reflects all adjustments necessary for a fair presentation of the
financial statements for the periods presented.

Because of seasonal and other factors, revenues, expenses, net income and
earnings per share for the interim periods should not be construed as
representative of revenues, expenses, net income and earnings per share for all
or any part of the balance of the current year or succeeding periods.

2. RESTATEMENT

As discussed in MCN's 1998 Annual Report on Form 10-K/A, subsequent to the
issuance of MCN's December 31, 1998 financial statements, certain matters came
to management's attention and resulted in a special investigation of prior
years' operations of CoEnergy Trading Company (CTC), MCN's non-utility energy
marketing subsidiary. As a result of the investigation, MCN identified that its
internal controls had been overridden and that certain transactions had not been
properly accounted for. Specifically, the investigation concluded that CTC had
entered into gas supply contracts and agreed to pay significantly less than
market prices in one period in return for above-market prices to be paid in
subsequent periods through March 2000. The effect of these transactions was to
improperly delay the accrual of cost of gas expenses, resulting in the
understatement of net income for the 1998 first quarter by $870,000 and the
overstatement of net income for the 1998 twelve-month period by $5,533,000.

Additionally, the investigation identified that CTC had entered into certain
unauthorized gas purchase and sale contracts for trading purposes. The
unauthorized transactions violate MCN's risk-management policy that requires all
such activities to be reviewed and approved by a risk committee that reports
regularly to the MCN Board of Directors. The gas purchase and sale contracts
entered into in connection with trading activities, some of which remain in
effect through March 2000, were not accounted for properly using the required
mark-to-market method, under which unrealized gains and losses are recorded as
an adjustment to cost of gas. The effect of not properly accounting for these
transactions was the overstatement of net income for the 1998 first quarter by
$2,476,000 and the overstatement of net income for the 1998 twelve-month period
by $3,235,000. However, net income of $911,000 and $2,735,000 was realized and
recorded in connection with these trading activities in the 1998 quarter and
twelve-month period, respectively, resulting in a net loss of $1,565,000 in the
1998 first quarter and $500,000 in the 1998 twelve-month period from such
activities. From the inception of these trading activities in March 1997 through
March 1999, $5,721,000 of net income was realized and recorded in connection
with these trading activities. However, marking these contracts to market, as
required, results in a previously unrecorded net unrealized loss of $8,435,000
through March 1999, indicating a net loss of $2,714,000 from such activities.

Other items identified during the investigation resulted in the overstatement of
net income for the 1998 first quarter by $22,000 and the overstatement of net
income for the 1998 twelve-month period by $87,000.

                                       23
<PAGE>   26
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The 1998 information in the accompanying consolidated financial statements has
been restated from amounts originally reported to properly account for the
transactions identified. A summary of the significant effects of the restatement
on MCN's March 31, 1998 financial statements is as follows:

<TABLE>
<CAPTION>
                                                 THREE MONTHS ENDED        TWELVE MONTHS ENDED
                                                   MARCH 31, 1998            MARCH 31, 1998
                                               -----------------------   -----------------------
                                               PREVIOUSLY                PREVIOUSLY
(IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)       REPORTED*     RESTATED    REPORTED*     RESTATED
----------------------------------------       ----------   ----------   ----------   ----------
<S>                                            <C>          <C>          <C>          <C>
CONSOLIDATED STATEMENT OF OPERATIONS
  Cost of Gas................................  $  434,528   $  437,032   $1,312,774   $1,326,395
  Income From Continuing Operations Before
     Income Taxes............................  $  120,022   $  117,518   $  186,026   $  172,405
  Income Tax Provision.......................  $   41,454   $   40,578   $   67,046   $   62,280
  Income From Continuing Operations..........  $   78,568   $   76,940   $  118,980   $  110,125
  Net Income.................................  $   80,510   $   78,882   $  141,047   $  132,192
  Basic Earnings Per Share
     Continuing Operations...................  $     1.00   $      .98         1.57   $     1.46
     Continuing and Discontinued
       Operations............................  $     1.03   $     1.01   $     1.86   $     1.75
  Diluted Earnings Per Share
     Continuing Operations...................  $      .95   $      .93         1.54   $     1.43
     Continuing and Discontinued
       Operations............................  $      .97   $      .95         1.81   $     1.70
</TABLE>

<TABLE>
<CAPTION>
                                                   MARCH 31, 1998
                                               -----------------------
                                               PREVIOUSLY
                                                REPORTED     RESTATED
                                               ----------   ----------
<S>                                            <C>          <C>          <C>          <C>
CONSOLIDATED STATEMENT OF FINANCIAL POSITION
  Accounts Receivable........................  $  434,004   $  434,541
  Accounts Payable...........................  $  266,596   $  283,600
  Federal Income, Property and Other Taxes
     Payable.................................  $   95,852   $   90,090
  Common Shareholders' Equity................  $1,220,005   $1,209,300
</TABLE>

* Amounts reflect the reclassification of MCN's Exploration & Production (E&P)
  segment as a discontinued operation (Note 6).

3. ACCOUNTING FOR START-UP ACTIVITIES

In January 1999, MCN adopted Statement of Position (SOP) 98-5, "Reporting on the
Costs of Start-up Activities," issued by the Accounting Standards Executive
Committee of the American Institute of Certified Public Accountants. SOP 98-5
requires start-up and organizational costs to be expensed as incurred. This
change in accounting principle resulted in the write-off of start-up and
organization costs capitalized as of December 31, 1998. The cumulative effect of
the change was to decrease earnings by $4,418,000 pre-tax ($2,872,000 net of
taxes) for the three-and twelve-month periods ended March 31, 1999.

4. REGULATORY MATTERS

     A. REGULATORY REFORM PLAN

     As discussed in MCN's 1998 Annual Report on Form 10-K/A, MichCon
     implemented its Regulatory Reform Plan in January 1999. The plan includes a
     new three-year gas sales program under which MichCon's gas sales rates
     include a gas commodity component that is fixed at $2.95 per thousand cubic
     feet (Mcf). As part of its gas acquisition strategy, MichCon has

                                       24
<PAGE>   27
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

     entered into fixed-price contracts at costs below $2.95 per Mcf for a
     substantial portion of its expected gas supply requirements through 2001.

     The plan also includes a comprehensive experimental three-year customer
     choice program, which is subject to annual caps on the level of
     participation. The customer choice program began in April 1999, when
     approximately 70,000 customers chose to purchase natural gas from suppliers
     other than MichCon. Plan years begin April 1 of each year, and the number
     of customers allowed to participate in the plan is limited to 75,000 in
     1999, 150,000 in 2000 and 225,000 in 2001. There is also a volume
     limitation on commercial and industrial participants. The volume limitation
     for these participants is 10 billion cubic feet (Bcf) in 1999, 20 Bcf in
     2000 and 30 Bcf in 2001. MichCon will continue to transport and deliver the
     gas to the customers' premises at prices that maintain its previously
     existing sales margins. Various parties have appealed the Michigan Public
     Service Commission's (MPSC) approval of the plan. While management believes
     the plan will be upheld on appeal, there can be no assurance as to the
     outcome.

     b. GAS COST RECOVERY PROCEEDINGS

     Prior to January 1999, the Gas Cost Recovery (GCR) process allowed MichCon
     to recover its cost of gas sold if the MPSC determined that such costs were
     reasonable and prudent. An annual GCR reconciliation proceeding provided a
     review of gas costs incurred during the previous year and determined
     whether gas costs had been overcollected or undercollected, and as a
     result, whether a refund or surcharge, including interest, was required to
     be returned to or collected from GCR customers. The GCR process was
     suspended with the implementation of MichCon's Regulatory Reform Plan in
     January 1999.

     In February 1999, MichCon filed its final GCR reconciliation case covering
     gas costs incurred during 1998 which indicates an overrecovery of
     $18,000,000, including interest. Management believes that 1998 gas costs
     were reasonable and prudent and that the MPSC will approve the gas costs
     incurred. However, management cannot predict the outcome of this
     proceeding. During the first quarter of 1999, MichCon refunded the
     overrecovery to customers as a reduction in gas sale rates.

5. PROPERTY WRITE-DOWNS, INVESTMENT LOSS AND RESTRUCTURING CHARGES

As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN recorded several
unusual charges in 1998, consisting of property write-downs, an investment loss
and restructuring charges, which reduced MCN's earnings for the 1999
twelve-month period by $183,841,000 pre-tax ($114,578,000 net of taxes and
minority interest). A discussion of each unusual charge by segment follows:

Pipelines & Processing recorded a $133,782,000 pre-tax ($86,959,000 net of
taxes) write-off of its coal fines project equal to the carrying value of the
plants, reflecting the likely inability to recover such costs. MCN is seeking to
maximize the value of its investment in the coal fines project, but is unable to
predict the outcome of such efforts.

MCN also recorded an impairment loss of $3,899,000 pre-tax ($2,534,000 net of
taxes) relating to an acquired out-of-service pipeline in Michigan. MCN reviewed
the business alternatives for this asset and determined that its development is
unlikely. Accordingly, MCN recorded an impairment loss equal to the carrying
value of this asset.

                                       25
<PAGE>   28
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Electric Power recorded a $2,470,000 pre-tax ($1,605,000 net of taxes)
restructuring charge related to certain international power projects. The charge
was incurred as a result of refocusing MCN's strategic plan, particularly to
exit certain international power projects and to limit future capital
investments in developing countries to projects where it has existing
commitments.

Corporate & Other recorded a $10,390,000 pre-tax ($6,753,000 net of taxes)
restructuring charge related to the corporate realignment designed to improve
operating efficiencies through a more streamlined organizational structure. The
realignment includes cost saving initiatives expected to reduce future operating
expenses. As of March 31, 1999, payments of $1,530,000 have been charged against
the restructuring accruals relating to severance and termination benefits. These
benefits will continue to be paid through 2000. The remaining restructuring
costs, primarily for net lease expenses, are expected to be paid over the
related lease terms that expire through 2006.

Gas Distribution recorded a $24,800,000 pre-tax ($11,200,000 net of taxes and
minority interest) write-down of certain gas gathering properties. An analysis
revealed that projected cash flows from the gathering system were not sufficient
to cover the system's carrying value. Therefore, an impairment loss was recorded
representing the amount by which the carrying value of the system exceeded its
estimated fair value.

MCN also recorded an $8,500,000 pre-tax ($5,525,000 net of taxes) loss from the
write-down of an investment in a Missouri gas distribution company. As a result
of MCN's refocused strategic direction, MCN expects to sell this investment in
1999. The write-down represents the amount by which the carrying value exceeded
the estimated fair value of the investment.

6. DISCONTINUED OPERATIONS

As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN has decided to sell
its E&P properties and accordingly has classified this segment as a discontinued
operation. MCN completed the sale of the western U.S. portion of its E&P
properties in April 1999 for approximately $165,000,000. In May 1999, MCN
reached an agreement to sell its Midcontinent/Gulf Coast properties. Bids on all
remaining properties have been received and the properties are expected to be
sold in mid-1999. E&P operating results for 1999 will be deferred until the
sales of such properties have been completed. MCN recognized $423,112,000
pre-tax ($275,022,000 net of taxes) of write-downs of its gas and oil properties
in the 1999 twelve-month period.

                                       26
<PAGE>   29
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following financial information summarizes E&P's operations:

<TABLE>
<CAPTION>
                                                   THREE MONTHS ENDED            TWELVE MONTHS ENDED
                                                       MARCH 31,                      MARCH 31,
                                                ------------------------      --------------------------
                                                  1999            1998          1999              1998
(in Thousands)                                  --------         -------      ---------         --------
<S>                                             <C>              <C>          <C>               <C>
Operating Revenues.......................       $     --         $55,612      $ 151,490         $221,333
                                                --------         -------      ---------         --------
Operating Income (Loss)..................       $     --         $ 8,733      $(396,688)        $ 46,807
                                                --------         -------      ---------         --------
Income (Loss) Before Income Taxes........       $     --         $(2,828)     $(433,931)        $  8,432
Income Tax Benefits......................             --          (4,770)      (159,198)         (13,635)
                                                --------         -------      ---------         --------
Net Income (Loss)........................       $     --         $ 1,942      $(274,733)        $ 22,067
                                                ========         =======      =========         ========
</TABLE>

<TABLE>
<CAPTION>
                                                                    MARCH 31,         DEC. 31,
                                                              ---------------------   --------
                                                                1999        1998        1998
(in Thousands)                                                --------   ----------   --------
<S>                                                           <C>        <C>          <C>
ASSETS
  Accounts receivable, net..................................  $ 49,617   $   43,949   $ 74,273
  Property, plant and equipment, net........................   807,275    1,194,298    815,252
  Noncurrent deferred income taxes..........................    89,320           --     96,006
  Other.....................................................    14,593       36,687      2,670
                                                              --------   ----------   --------
                                                              $960,805   $1,274,934   $988,201
                                                              ========   ==========   ========
LIABILITIES
  Accounts payable..........................................  $ 24,078   $   48,875   $ 59,063
  Long-term debt and capital lease obligations..............       299      120,619        929
  Noncurrent deferred income taxes..........................        --       66,561         --
  Other.....................................................     4,437           71      9,458
                                                              --------   ----------   --------
                                                              $ 28,814   $  236,126   $ 69,450
                                                              ========   ==========   ========
</TABLE>

7. GAS IN INVENTORY

Inventory gas is priced on a last-in, first-out (LIFO) basis. In anticipation
that interim inventory reductions will be replaced prior to year-end, the cost
of gas for net withdrawals from inventory is generally recorded at the estimated
average purchase rate for the calendar year. The excess of these changes over
the LIFO cost is credited to the gas inventory equalization account. During
interim periods when there are net injections to inventory, the equalization
account is reversed. Approximately 57.7 Bcf and 53.5 Bcf of gas was in inventory
at March 31, 1999 and 1998, respectively.

8. CREDIT FACILITIES

In March 1999, MCN entered into a $150,000,000 revolving credit agreement that
expires in October 1999. Borrowings under the credit agreement are at variable
rates. As of March 31, 1999, there were no amounts outstanding under this
agreement.

9. ENHANCED PRIDES AND LONG-TERM DEBT

As discussed in MCN's 1998 Annual Report on Form 10-K/A, MCN issued 5,865,000 of
Preferred Redeemable Increased Dividend Equity Securities (Enhanced PRIDES) in
1996. Each security represented a contract to purchase one share of MCN common
stock. The Enhanced PRIDES were converted into MCN common stock in April 1999,
and as a result MCN received cash proceeds

                                       27
<PAGE>   30
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

totaling approximately $135,000,000. These proceeds were used to repay a
$130,000,000 medium-term note that came due in May 1999. Also in February 1999,
MCN repaid an $80,000,000 medium-term note.

10. EARNINGS PER SHARE COMPUTATION

MCN reports both basic and diluted earnings per share. Basic EPS is computed by
dividing income from continuing operations by the weighted average number of
common shares outstanding during the period. Diluted EPS assumes the issuance of
potential dilutive common shares outstanding during the period and adjusts for
changes in income and the repurchase of common shares that would have occurred
with proceeds from the assumed issuance. A reconciliation of both calculations
is shown below.

<TABLE>
<CAPTION>
                                                                       WEIGHTED
                                                  INCOME FROM           AVERAGE
                                                   CONTINUING           COMMON           EARNINGS
                                                   OPERATIONS           SHARES          PER SHARE
                                               ------------------   ---------------   --------------
                                                1999       1998      1999     1998     1999    1998
(in Thousands, Except Per Share Amounts)       -------   --------   ------   ------   ------   -----
<S>                                            <C>       <C>        <C>      <C>      <C>      <C>
THREE MONTHS ENDED MARCH 31
  Basic EPS..................................  $88,415   $ 76,940   79,413   78,365   $ 1.11   $ .98
                                                                                      ------   -----
  Effect of Dilutive Securities:
     FELINE PRIDES...........................    1,571      1,581    4,560    3,738
     Enhanced PRIDES.........................       --         40       --    1,343
     Stock-based compensation plans..........       --         --    1,091    1,058
                                               -------   --------   ------   ------
  Diluted EPS................................  $89,986   $ 78,561   85,064   84,504   $ 1.06   $ .93
                                               =======   ========   ======   ======   ------   -----
TWELVE MONTHS ENDED MARCH 31
  Basic EPS..................................  $(2,202)  $110,125   79,081   75,658   $ (.03)  $1.46
                                                                                      ------   -----
  Effect of Dilutive Securities:
     FELINE PRIDES...........................       --      6,323       --    4,020
     Enhanced PRIDES.........................       --        196       --      848
     Stock-based compensation plans..........       --         --       --      913
                                               -------   --------   ------   ------
  Diluted EPS................................  $(2,202)  $116,644   79,081   81,439   $ (.03)  $1.43
                                               =======   ========   ======   ======   ------   -----
</TABLE>

                                       28
<PAGE>   31
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

11. COMPREHENSIVE INCOME

MCN reports comprehensive income, which is defined as the change in common
shareholder's equity during a period from transactions and events from non-owner
sources, including net income. Total comprehensive income for the applicable
periods is as follows:

<TABLE>
<CAPTION>
                                                 THREE MONTHS ENDED            TWELVE MONTHS ENDED
                                                      MARCH 31,                     MARCH 31,
                                               -----------------------       ------------------------
                                                1999            1998           1999            1998
(in Thousands)                                 -------         -------       ---------       --------
<S>                                            <C>             <C>           <C>             <C>
COMPREHENSIVE INCOME (LOSS)
  Net Income (Loss)..........................  $85,543         $78,882       $(279,807)      $132,192
                                               -------         -------       ---------       --------
  Other Comprehensive Income (Loss), Net of
     Taxes:
     Foreign currency translation
       adjustment............................      282            (499)         (5,773)        (6,773)
                                               -------         -------       ---------       --------
     Unrealized loss on securities:
       Unrealized losses during period.......     (517)         (1,067)         (5,941)        (2,251)
       Less: Reclassification for losses
          recognized in net income...........       --              --           3,987             --
                                               -------         -------       ---------       --------
                                                  (517)         (1,067)         (1,954)        (2,251)
                                               -------         -------       ---------       --------
  Total Other Comprehensive Loss, Net of
     Taxes...................................     (235)         (1,566)         (7,727)        (9,024)
                                               -------         -------       ---------       --------
  Total Comprehensive Income (Loss)..........  $85,308         $77,316       $(287,534)      $123,168
                                               =======         =======       =========       ========
</TABLE>

12. CONTINGENCIES

MCN is involved in certain legal and administrative proceedings before various
courts and governmental agencies concerning claims arising in the ordinary
course of business. These proceedings include certain contract disputes between
Gas Distribution and gas producers. Management cannot predict the final
disposition of such proceedings, but believes that adequate provision has been
made for probable losses. It is management's belief, after discussion with legal
counsel, that the ultimate resolution of those proceedings still pending will
not have a material adverse effect on MCN's financial statements.

13. COMMODITY SWAP AGREEMENTS

MCN's Diversified Energy and Gas Distribution groups manage commodity price risk
through the use of various derivative instruments and predominately limit the
use of such instruments to hedging

                                       29
<PAGE>   32
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

activities. The following assets and liabilities related to the use of gas and
oil swap agreements are reflected in the Consolidated Statement of Financial
Position:

<TABLE>
<CAPTION>
                                                                 MARCH 31,       DECEMBER 31,
                                                             -----------------   ------------
                                                              1999      1998         1998
                      (in Thousands)                         -------   -------   ------------
<S>                                                          <C>       <C>       <C>
DEFERRED SWAP LOSSES AND RECEIVABLES
  Unrealized losses........................................  $36,120   $59,307     $48,700
  Receivables..............................................   19,012     8,134      25,864
                                                             -------   -------     -------
                                                              55,132    67,441      74,564
  Less -- Current portion..................................    6,622       388      11,417
                                                             -------   -------     -------
                                                             $48,510   $67,053     $63,147
                                                             =======   =======     =======
DEFERRED SWAP GAINS AND PAYABLES
  Unrealized gains.........................................  $17,809   $ 4,504     $24,126
  Payables.................................................   41,283    67,407      54,525
                                                             -------   -------     -------
                                                              59,092    71,911      78,651
  Less -- Current portion..................................    7,487    22,695      15,695
                                                             -------   -------     -------
                                                             $51,605   $49,216     $62,956
                                                             =======   =======     =======
</TABLE>

14. SEGMENT INFORMATION

MCN is a diversified energy holding company with natural gas markets and
investments primarily in North America. MCN is organized into two business
groups, Diversified Energy and Gas Distribution. The groups operate four major
business segments as is set forth in the following tables.

<TABLE>
<CAPTION>
                                                     THREE MONTHS ENDED       TWELVE MONTHS ENDED
                                                         MARCH 31,                 MARCH 31,
                                                   ----------------------   -----------------------
                                                     1999          1998        1999         1998
                 (in Thousands)                    --------      --------   ----------   ----------
<S>                                                <C>           <C>        <C>          <C>
Revenues From Unaffiliated Customers:
  Pipelines & Processing.........................  $  5,905      $  2,233   $   24,528   $    7,240
  Electric Power.................................    12,143         9,678       49,596       47,382
  Energy Marketing...............................   242,612       214,513      795,167      751,510
  Gas Distribution...............................   507,012       432,160    1,119,991    1,162,558
                                                   --------      --------   ----------   ----------
                                                    767,672       658,584    1,989,282    1,968,690
                                                   --------      --------   ----------   ----------
Revenues From Affiliated Customers:
  Pipelines & Processing.........................       174           174          345          396
  Energy Marketing...............................    18,085        24,009       99,619       90,355
  Gas Distribution...............................     2,668         3,250        6,053        9,757
                                                   --------      --------   ----------   ----------
                                                     20,927        27,433      106,017      100,508
                                                   --------      --------   ----------   ----------
Eliminations.....................................   (20,927)      (27,433)    (106,017)    (100,508)
                                                   --------      --------   ----------   ----------
Consolidated Operating Revenues..................  $767,672      $658,584   $1,989,282   $1,968,690
                                                   ========      ========   ==========   ==========
Net Income (Loss):
  Pipelines & Processing.........................  $  1,675      $  4,454   $  (84,478)  $   16,690
  Electric Power.................................     4,401         7,719       16,887       19,919
  Energy Marketing...............................     2,355         3,411       (2,094)       1,786
  Gas Distribution...............................    84,293        62,656       93,371       79,852
  Corporate & Other..............................    (4,309)       (1,300)     (25,888)      (8,122)
                                                   --------      --------   ----------   ----------
                                                     88,415        76,940       (2,202)     110,125
  Discontinued Operations........................        --         1,942     (274,733)      22,067
  Cumulative effect of accounting change.........    (2,872)           --       (2,872)          --
                                                   --------      --------   ----------   ----------
Consolidated Net Income (Loss)...................  $ 85,543      $ 78,882   $ (279,807)  $  132,192
                                                   ========      ========   ==========   ==========
</TABLE>

                                       30
<PAGE>   33
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

15. CONSOLIDATING FINANCIAL STATEMENTS

Debt securities issued by MCN Investment Corporation (MCNIC) are subject to a
support agreement between MCN and MCNIC, under which MCN has committed to make
payments of interest and principal on MCNIC's securities in the event of failure
to pay by MCNIC. Under the terms of the support agreement, the assets of MCN,
other than MichCon, and any cash dividends paid to MCN by any of its
subsidiaries are available as recourse to holders of MCNIC's securities. The
carrying value of MCN's assets on an unconsolidated basis, which primarily
consists of investments in subsidiaries other than MichCon, is $954,823,000 at
March 31, 1999.

The following MCN consolidating financial statements are presented and include
separately MCNIC, MichCon and MCN and other subsidiaries. MCN has determined
that separate financial statements and other disclosures concerning MCNIC are
not material to investors. The other MCN subsidiaries represent Citizens Gas
Fuel Company, MCN Michigan Limited Partnership, MCN Financing I, MCN Financing
III, MCN Financing V, MCN Financing VI, MichCon Enterprises, Inc. and Blue Lake
Holdings, Inc., until its sale on December 31, 1997.

                                       31
<PAGE>   34
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

               CONSOLIDATING STATEMENTS OF OPERATIONS (Unaudited)

<TABLE>
<CAPTION>
                                                               MCN                              ELIMINATIONS
                                                            AND OTHER                               AND        CONSOLIDATED
                                                           SUBSIDIARIES    MCNIC     MICHCON     RECLASSES        TOTAL
                                                           ------------    -----     -------    ------------   ------------
(in Thousands)                                                            THREE MONTHS ENDED MARCH 31, 1999
                                                           ----------------------------------------------------------------
<S>                                                        <C>            <C>        <C>        <C>            <C>
OPERATING REVENUES.......................................    $11,664      $264,653   $498,090     $ (6,735)      $767,672
                                                             -------      --------   --------     --------       --------
OPERATING EXPENSES
  Cost of gas............................................      7,405       242,435   248,351        (4,172)       494,019
  Operation and maintenance..............................     (1,425)       18,657    67,546        (2,537)        82,241
  Depreciation, depletion and amortization...............        834           877    24,608            --         26,319
  Property and other taxes...............................        388           370    18,462             6         19,226
                                                             -------      --------   --------     --------       --------
                                                               7,202       262,339   358,967        (6,703)       621,805
                                                             -------      --------   --------     --------       --------
OPERATING INCOME.........................................      4,462         2,314   139,123           (32)       145,867
                                                             -------      --------   --------     --------       --------
EQUITY IN EARNINGS OF JOINT VENTURES AND SUBSIDIARIES....     84,053        12,017       441       (84,053)        12,458
                                                             -------      --------   --------     --------       --------
OTHER INCOME AND (DEDUCTIONS)
  Interest income........................................      5,293           396       999        (5,313)         1,375
  Interest on long-term debt.............................        211        (5,750)  (10,966)           --        (16,505)
  Other interest expense.................................     (4,162)       (4,085)   (2,655)        5,311         (5,591)
  Dividends on preferred securities of subsidiaries......         --            --        --        (4,972)        (4,972)
  Minority interest......................................         --           (62)     (257)           --           (319)
  Other..................................................       (131)          953       464            34          1,320
                                                             -------      --------   --------     --------       --------
                                                               1,211        (8,548)  (12,415)       (4,940)       (24,692)
                                                             -------      --------   --------     --------       --------
INCOME BEFORE INCOME TAXES...............................     89,726         5,783   127,149       (89,025)       133,633
INCOME TAX PROVISION.....................................        259         1,783    43,176            --         45,218
                                                             -------      --------   --------     --------       --------
INCOME BEFORE CUMULATIVE EFFECT OF ACCOUNTING CHANGE.....     89,467         4,000    83,973       (89,025)        88,415
CUMULATIVE EFFECT OF ACCOUNTING CHANGE, NET OF TAXES.....         --        (2,872)       --            --         (2,872)
                                                             -------      --------   --------     --------       --------
NET INCOME...............................................     89,467         1,128    83,973       (89,025)        85,543
DIVIDENDS ON PREFERRED SECURITIES........................      4,972            --        --        (4,972)            --
                                                             -------      --------   --------     --------       --------
NET INCOME AVAILABLE FOR COMMON STOCK....................    $84,495      $  1,128   $83,973      $(84,053)      $ 85,543
                                                             =======      ========   ========     ========       ========
</TABLE>

<TABLE>
<CAPTION>
                                                                         THREE MONTHS ENDED MARCH 31, 1998
                                                          ----------------------------------------------------------------
<S>                                                       <C>            <C>        <C>        <C>            <C>
OPERATING REVENUES......................................    $ 6,182      $228,978   $429,227     $ (5,803)      $658,584
                                                            -------      --------   --------     --------       --------
OPERATING EXPENSES
  Cost of gas...........................................      3,121       219,517   217,589        (3,195)       437,032
  Operation and maintenance.............................        140        11,599    62,222        (2,608)        71,353
  Depreciation, depletion and amortization..............        646           663    22,445            --         23,754
  Property and other taxes..............................        633           617    17,302            --         18,552
                                                            -------      --------   --------     --------       --------
                                                              4,540       232,396   319,558        (5,803)       550,691
                                                            -------      --------   --------     --------       --------
OPERATING INCOME (LOSS).................................      1,642        (3,418)  109,669            --        107,893
                                                            -------      --------   --------     --------       --------
EQUITY IN EARNINGS OF JOINT VENTURES AND SUBSIDIARIES...     79,253        16,307       589       (79,388)        16,761
                                                            -------      --------   --------     --------       --------
OTHER INCOME AND (DEDUCTIONS)
  Interest income.......................................      5,500         3,056     1,112        (5,458)         4,210
  Interest on long-term debt............................        241        (1,195)  (12,206)           --        (13,160)
  Other interest expense................................       (449)       (6,917)   (3,257)        5,560         (5,063)
  Dividends on preferred securities of subsidiaries.....         --            --        --        (5,209)        (5,209)
  Minority interest.....................................         --           135      (745)           --           (610)
  Other.................................................         34        12,541       121            --         12,696
                                                            -------      --------   --------     --------       --------
                                                              5,326         7,620   (14,975)       (5,107)        (7,136)
                                                            -------      --------   --------     --------       --------
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES...     86,221        20,509    95,283       (84,495)       117,518
INCOME TAX PROVISION....................................        604         6,355    33,619            --         40,578
                                                            -------      --------   --------     --------       --------
INCOME FROM CONTINUING OPERATIONS.......................     85,617        14,154    61,664       (84,495)        76,940
DISCONTINUED OPERATIONS, NET OF TAXES...................         --         1,942        --            --          1,942
                                                            -------      --------   --------     --------       --------
NET INCOME..............................................     85,617        16,096    61,664       (84,495)        78,882
DIVIDENDS ON PREFERRED SECURITIES.......................      5,209            --        --        (5,209)            --
                                                            -------      --------   --------     --------       --------
NET INCOME AVAILABLE FOR COMMON STOCK...................    $80,408      $ 16,096   $61,664      $(79,286)      $ 78,882
                                                            =======      ========   ========     ========       ========
</TABLE>

                                       32
<PAGE>   35
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

               CONSOLIDATING STATEMENTS OF OPERATIONS (Unaudited)

<TABLE>
<CAPTION>
                                                        MCN                                  ELIMINATIONS
                                                     AND OTHER                                   AND        CONSOLIDATED
                                                    SUBSIDIARIES     MCNIC       MICHCON      RECLASSES        TOTAL
                                                    ------------   ----------   ----------   ------------   ------------
(in Thousands)                                                       TWELVE MONTHS ENDED MARCH 31, 1999
                                                    --------------------------------------------------------------------
<S>                                                 <C>            <C>          <C>          <C>            <C>
OPERATING REVENUES................................   $  23,744     $  877,999   $1,102,521     $(14,982)     $1,989,282
                                                     ---------     ----------   ----------     --------      ----------
OPERATING EXPENSES
  Cost of gas.....................................      14,990        831,723      482,291       (9,645)      1,319,359
  Operation and maintenance.......................     (11,772)        72,211      257,721       (5,311)        312,849
  Depreciation, depletion and amortization........       3,394          3,039       95,046           --         101,479
  Property and other taxes........................       1,474          2,099       56,598            6          60,177
  Property write-downs and restructuring
    charges.......................................       8,669        141,872       24,800           --         175,341
                                                     ---------     ----------   ----------     --------      ----------
                                                        16,755      1,050,944      916,456      (14,950)      1,969,205
                                                     ---------     ----------   ----------     --------      ----------
OPERATING INCOME (LOSS)...........................       6,989       (172,945)     186,065          (32)         20,077
                                                     ---------     ----------   ----------     --------      ----------
EQUITY IN EARNINGS (LOSSES) OF JOINT VENTURES AND
  SUBSIDIARIES....................................    (269,971)        56,952        1,798      269,143          57,922
                                                     ---------     ----------   ----------     --------      ----------
OTHER INCOME AND (DEDUCTIONS)
  Interest income.................................      18,444          3,523        5,575      (19,910)          7,632
  Interest on long-term debt......................        (671)       (19,673)     (43,644)          --         (63,988)
  Other interest expense..........................      (6,187)       (21,443)     (11,511)      19,807         (19,334)
  Dividends on preferred securities of
    subsidiaries..................................          --             --           --      (17,376)        (17,376)
  Investment loss.................................      (8,500)            --           --           --          (8,500)
  Minority interest...............................          --             68        6,215           --           6,283
  Other...........................................        (770)           797          161           34             222
                                                     ---------     ----------   ----------     --------      ----------
                                                         2,316        (36,728)     (43,204)     (17,445)        (95,061)
                                                     ---------     ----------   ----------     --------      ----------
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE
  INCOME TAXES....................................    (260,666)      (152,721)     144,659      251,666         (17,062)
INCOME TAX PROVISION (BENEFIT)....................      (3,174)       (57,060)      45,374           --         (14,860)
                                                     ---------     ----------   ----------     --------      ----------
INCOME (LOSS) FROM CONTINUING OPERATIONS..........    (257,492)       (95,661)      99,285      251,666          (2,202)
DISCONTINUED OPERATIONS, NET OF TAXES.............          --       (274,733)          --           --        (274,733)
                                                     ---------     ----------   ----------     --------      ----------
INCOME (LOSS) BEFORE CUMULATIVE EFFECT OF
  ACCOUNTING CHANGE...............................    (257,492)      (370,394)      99,285      251,666        (276,935)
CUMULATIVE EFFECT OF ACCOUNTING CHANGE............          --         (2,872)          --           --          (2,872)
                                                     ---------     ----------   ----------     --------      ----------
NET INCOME (LOSS).................................    (257,492)      (373,266)      99,285      251,666        (279,807)
DIVIDENDS ON PREFERRED SECURITIES.................      17,376             --           --      (17,376)             --
                                                     ---------     ----------   ----------     --------      ----------
NET INCOME (LOSS) AVAILABLE FOR COMMON STOCK......   $(274,868)    $ (373,266)  $   99,285     $269,042      $ (279,807)
                                                     =========     ==========   ==========     ========      ==========
</TABLE>

<TABLE>
<CAPTION>
                                                                     TWELVE MONTHS ENDED MARCH 31, 1998
                                                    --------------------------------------------------------------------
<S>                                                 <C>            <C>          <C>          <C>            <C>
OPERATING REVENUES................................   $  16,852     $  811,093   $1,155,461    $ (14,716)     $1,968,690
                                                     ---------     ----------   ----------    ---------      ----------
OPERATING EXPENSES
  Cost of gas.....................................       9,057        780,220      546,545       (9,427)      1,326,395
  Operation and maintenance.......................       2,367         37,245      270,757       (5,289)        305,080
  Depreciation, depletion and amortization........       2,373          1,971      100,647           --         104,991
  Property and other taxes........................       1,614          1,169       60,252           --          63,035
  Property write-downs and restructuring
    charges.......................................          --             --           --           --              --
                                                     ---------     ----------   ----------    ---------      ----------
                                                        15,411        820,605      978,201      (14,716)      1,799,501
                                                     ---------     ----------   ----------    ---------      ----------
OPERATING INCOME (LOSS)...........................       1,441         (9,512)     177,260           --         169,189
                                                     ---------     ----------   ----------    ---------      ----------
EQUITY IN EARNINGS OF JOINT VENTURES AND
  SUBSIDIARIES....................................     142,440         53,603        1,478     (141,362)         56,159
                                                     ---------     ----------   ----------    ---------      ----------
OTHER INCOME AND (DEDUCTIONS)
  Interest Income.................................      17,352          8,320        4,562      (17,215)         13,019
  Interest on long-term debt......................         507         (9,492)     (46,992)          --         (55,977)
  Other interest expense..........................       1,108        (19,927)      (9,030)      17,605         (10,244)
  Dividends on preferred securities of
    subsidiaries..................................          --             --           --      (17,993)        (17,993)
  Minority interest...............................          --             68       (2,289)          --          (2,221)
  Other...........................................         165         19,852          456           --          20,473
                                                     ---------     ----------   ----------    ---------      ----------
                                                        19,132         (1,179)     (53,293)     (17,603)        (52,943)
                                                     ---------     ----------   ----------    ---------      ----------
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME
  TAXES...........................................     163,013         42,912      125,445     (158,965)        172,405
INCOME TAX PROVISION..............................       2,235         13,091       46,954           --          62,280
                                                     ---------     ----------   ----------    ---------      ----------
INCOME FROM CONTINUING OPERATIONS.................     160,778         29,821       78,491     (158,965)        110,125
DISCONTINUED OPERATIONS, NET OF TAXES.............          --         22,067           --           --          22,067
                                                     ---------     ----------   ----------    ---------      ----------
NET INCOME........................................     160,778         51,888       78,491     (158,965)        132,192
DIVIDENDS ON PREFERRED SECURITIES.................      17,993             --           --      (17,993)             --
                                                     ---------     ----------   ----------    ---------      ----------
NET INCOME AVAILABLE FOR COMMON STOCK.............   $ 142,785     $   51,888   $   78,491    $(140,972)     $  132,192
                                                     =========     ==========   ==========    =========      ==========
</TABLE>

                                       33
<PAGE>   36
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

           CONSOLIDATING STATEMENT OF FINANCIAL POSITION (Unaudited)

<TABLE>
<CAPTION>
                                                       MCN                                     ELIMINATIONS
                                                    AND OTHER                                      AND         CONSOLIDATED
                                                   SUBSIDIARIES      MCNIC        MICHCON       RECLASSES         TOTAL
                                                   ------------    ----------    ----------    ------------    ------------
(in Thousands)                                                                  MARCH 31, 1999
                                                   ------------------------------------------------------------------------
<S>                                                <C>             <C>           <C>           <C>             <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents, at cost...........     $    1,472     $    9,849    $   23,512    $        --      $   34,833
  Accounts receivable..........................         11,697        225,981       226,238        (18,722)        445,194
    Less -- Allowance for doubtful accounts....             93          1,773        11,545             --          13,411
                                                    ----------     ----------    ----------    -----------      ----------
  Accounts receivable, net.....................         11,604        224,208       214,693        (18,722)        431,783
  Accrued unbilled revenues....................            904             --        76,431             --          77,335
  Gas in inventory.............................             --         65,637        24,485             --          90,122
  Property taxes assessed applicable to future
    periods....................................            262          3,547        59,255             --          63,064
  Other........................................          6,130         22,609        32,990        (11,667)         50,062
                                                    ----------     ----------    ----------    -----------      ----------
                                                        20,372        325,850       431,366        (30,389)        747,199
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CHARGES AND OTHER ASSETS
  Deferred income taxes........................            324        115,025            --        (86,295)         29,054
  Investments in debt and equity securities....             --          2,209        66,110            601          68,920
  Deferred swap losses and receivables.........             --         48,510            --             --          48,510
  Deferred environmental costs.................          2,770             --        28,286             --          31,056
  Prepaid benefit costs........................             --             --       124,235         (2,174)        122,061
  Other........................................         11,678         29,742        61,250          4,841         107,511
                                                    ----------     ----------    ----------    -----------      ----------
                                                        14,772        195,486       279,881        (83,027)        407,112
                                                    ----------     ----------    ----------    -----------      ----------
INVESTMENTS IN AND ADVANCES TO JOINT VENTURES
  AND SUBSIDIARIES.............................      1,589,031        814,912        19,808     (1,587,403)        836,348
                                                    ----------     ----------    ----------    -----------      ----------
PROPERTY, PLANT AND EQUIPMENT, at cost.........         48,826      1,125,366     2,911,368             --       4,085,560
  Less -- Accumulated depreciation and
    depletion..................................         17,943        250,082     1,420,513             --       1,688,538
                                                    ----------     ----------    ----------    -----------      ----------
                                                        30,883        875,284     1,490,855             --       2,397,022
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,655,058     $2,211,532    $2,221,910    $(1,700,819)     $4,387,681
                                                    ==========     ==========    ==========    ===========      ==========
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
  Accounts payable.............................     $    3,846     $  175,097    $   96,390    $   (16,967)     $  258,366
  Notes payable................................        237,762        188,828       107,900            149         534,639
  Current portion of long-term debt and capital
    lease obligations..........................             --        130,216        58,211             --         188,427
  Gas inventory equalization...................             --             --        79,559             --          79,559
  Federal income, property and other taxes
    payable....................................         (3,555)        (4,312)      103,464         (5,863)         89,734
  Deferred gas cost recovery revenues..........             --             --            --             --              --
  Gas payable..................................             --         11,680        25,835             --          37,515
  Customer deposits............................             17             --        17,459             --          17,476
  Other........................................         21,504         20,602        58,935         (2,591)         98,450
                                                    ----------     ----------    ----------    -----------      ----------
                                                       259,574        522,111       547,753        (25,272)      1,304,166
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CREDITS AND OTHER LIABILITIES
  Deferred income taxes........................        (10,383)            --        96,353        (85,970)             --
  Unamortized investment tax credit............            266             --        29,303             --          29,569
  Tax benefits amortizable to customers........             --             --       129,494             --         129,494
  Deferred swap gains and payables.............             --         51,605            --             --          51,605
  Accrued environmental costs..................          3,000             --        31,888             --          34,888
  Minority interest............................             --          2,230         8,175             --          10,405
  Other........................................         13,167         14,770        51,860         (2,174)         77,623
                                                    ----------     ----------    ----------    -----------      ----------
                                                         6,050         68,605       347,073        (88,144)        333,584
                                                    ----------     ----------    ----------    -----------      ----------
LONG-TERM DEBT, including capital lease
  obligations..................................             --        778,905       613,945             --       1,392,850
                                                    ----------     ----------    ----------    -----------      ----------
REDEEMABLE PREFERRED SECURITIES OF
  SUBSIDIARIES.................................        502,157             --            --             --         502,157
                                                    ----------     ----------    ----------    -----------      ----------
COMMON SHAREHOLDERS' EQUITY
  Common stock.................................            798              5        10,300        (10,305)            798
  Additional paid-in capital...................        830,450      1,042,982       230,399     (1,273,381)        830,450
  Retained earnings (deficit)..................         78,317       (184,265)      472,440       (303,717)         62,775
  Accumulated other comprehensive loss.........             --        (16,811)           --             --         (16,811)
  Yield enhancement, contract and issuance
    costs......................................        (22,288)            --            --             --         (22,288)
                                                    ----------     ----------    ----------    -----------      ----------
                                                       887,277        841,911       713,139     (1,587,403)        854,924
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,655,058     $2,211,532    $2,221,910    $(1,700,819)     $4,387,681
                                                    ==========     ==========    ==========    ===========      ==========
</TABLE>

                                       34
<PAGE>   37
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

           CONSOLIDATING STATEMENT OF FINANCIAL POSITION (Unaudited)

<TABLE>
<CAPTION>
                                                       MCN                                     ELIMINATIONS
                                                    AND OTHER                                      AND         CONSOLIDATED
                                                   SUBSIDIARIES      MCNIC        MICHCON       RECLASSES         TOTAL
                                                   ------------    ----------    ----------    ------------    ------------
                                                                                MARCH 31, 1998
(IN THOUSANDS)                                     ------------------------------------------------------------------------
<S>                                                <C>             <C>           <C>           <C>             <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents, at cost.............   $    8,349     $   14,281    $   17,083    $        --      $   39,713
  Accounts receivable............................       17,102        204,641       280,891        (49,432)        453,202
    Less -- Allowance for doubtful accounts......           85            453        18,123             --          18,661
                                                    ----------     ----------    ----------    -----------      ----------
  Accounts receivable, net.......................       17,017        204,188       262,768        (49,432)        434,541
  Accrued unbilled revenue.......................          846             --        63,400             --          64,246
  Gas in inventory...............................           --         44,923        20,188              1          65,112
  Property taxes assessed applicable to future
    periods......................................          178          1,783        54,765             --          56,726
  Other..........................................        6,092         35,334        28,348         (7,099)         62,675
                                                    ----------     ----------    ----------    -----------      ----------
                                                        32,482        300,509       446,552        (56,530)        723,013
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CHARGES AND OTHER ASSETS
  Investments in debt and equity securities......           --         14,098        35,538            350          49,986
  Deferred swap losses and receivables...........           --         67,053            --             --          67,053
  Deferred environmental costs...................        2,535             --        27,816             --          30,351
  Prepaid benefit costs..........................          640             --        85,817         (6,588)         79,869
  Other..........................................        6,280         30,097        47,232         (1,302)         82,307
                                                    ----------     ----------    ----------    -----------      ----------
                                                         9,455        111,248       196,403         (7,540)        309,566
                                                    ----------     ----------    ----------    -----------      ----------
INVESTMENTS IN AND ADVANCES TO JOINT VENTURES AND
  SUBSIDIARIES...................................    1,703,787        576,771        20,078     (1,694,881)        605,755
                                                    ----------     ----------    ----------    -----------      ----------
PROPERTY, PLANT AND EQUIPMENT, at cost...........       39,635      1,438,282     2,809,342             --       4,287,259
  Less -- Accumulated depreciation and
    depletion....................................       13,568        172,613     1,334,813             --       1,520,994
                                                    ----------     ----------    ----------    -----------      ----------
                                                        26,067      1,265,669     1,474,529             --       2,766,265
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,771,791     $2,254,197    $2,137,562    $(1,758,951)     $4,404,599
                                                    ==========     ==========    ==========    ===========      ==========
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
  Accounts payable...............................   $    6,028     $  228,015    $   90,568    $   (41,011)     $  283,600
  Notes payable..................................           --         65,048       117,094         (9,391)        172,751
  Current portion of long-term debt and capital
    lease obligations............................          365          1,557        27,616             --          29,538
  Gas inventory equalization.....................           --              6        70,894             --          70,900
  Federal income, property and other taxes
    payable......................................        1,166         (4,243)      100,257         (7,090)         90,090
  Deferred gas cost recovery revenues............           --             --        18,937             --          18,937
  Gas payable....................................           --          3,205        18,027             --          21,232
  Customer deposits..............................           20             --        15,323             --          15,343
  Other..........................................       17,754         12,026        49,724             (8)         79,496
                                                    ----------     ----------    ----------    -----------      ----------
                                                        25,333        305,614       508,440        (57,500)        781,887
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CREDITS AND OTHER LIABILITIES
  Deferred income taxes..........................       (4,290)        83,117        84,839             20         163,686
  Unamortized investment tax credit..............          293             --        32,284             --          32,577
  Tax benefits amortizable to customers..........           --             --       123,189             --         123,189
  Deferred swap gains and payables...............           --         49,216            --             --          49,216
  Accrued environmental costs....................        3,000             --        32,000             --          35,000
  Minority interest..............................           --          2,322        17,954             --          20,276
  Other..........................................       13,496         13,255        48,963         (6,609)         69,105
                                                    ----------     ----------    ----------    -----------      ----------
                                                        12,499        147,910       339,229         (6,589)        493,049
                                                    ----------     ----------    ----------    -----------      ----------
LONG-TERM DEBT, including capital lease
  obligations....................................           --        803,289       612,205             --       1,415,494
                                                    ----------     ----------    ----------    -----------      ----------
REDEEMABLE PREFERRED SECURITIES OF
  SUBSIDIARIES...................................      504,869             --            --             --         504,869
                                                    ----------     ----------    ----------    -----------      ----------
COMMON SHAREHOLDERS' EQUITY
  Common stock...................................          788              5        10,300        (10,305)            788
  Additional paid-in capital.....................      815,364        817,463       230,399     (1,047,862)        815,364
  Retained earnings..............................      434,862        189,001       436,989       (636,695)        424,157
  Accumulated other comprehensive income.........           --         (9,085)           --             --          (9,085)
  Yield enhancement, contract and issuance
    costs........................................      (21,924)            --            --             --         (21,924)
                                                    ----------     ----------    ----------    -----------      ----------
                                                     1,229,090        997,384       677,688     (1,694,862)      1,209,300
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,771,791     $2,254,197    $2,137,562    $(1,758,951)     $4,404,599
                                                    ==========     ==========    ==========    ===========      ==========
</TABLE>

                                       35
<PAGE>   38
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Continued)

           CONSOLIDATING STATEMENT OF FINANCIAL POSITION (Unaudited)

<TABLE>
<CAPTION>
                                                       MCN                                     ELIMINATIONS
                                                    AND OTHER                                      AND         CONSOLIDATED
                                                   SUBSIDIARIES      MCNIC        MICHCON       RECLASSES         TOTAL
                                                   ------------    ----------    ----------    ------------    ------------
(in Thousands)                                                                DECEMBER 31, 1998
                                                   ------------------------------------------------------------------------
<S>                                                <C>             <C>           <C>           <C>             <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents, at cost.............   $    1,400     $    9,036    $    6,603    $        --      $   17,039
  Accounts receivable............................       10,039        265,312       151,746        (17,312)        409,785
    Less -- Allowance for doubtful accounts......           84            653         8,928             --           9,665
                                                    ----------     ----------    ----------    -----------      ----------
  Accounts receivable, net.......................        9,955        264,659       142,818        (17,312)        400,120
  Accrued unbilled revenues......................        1,121             --        86,767             --          87,888
  Gas in inventory...............................           --         90,418        56,969             --         147,387
  Property taxes assessed applicable to future
    periods......................................          214          1,172        71,165             --          72,551
  Other..........................................        5,143         11,872        30,169         (4,712)         42,472
                                                    ----------     ----------    ----------    -----------      ----------
                                                        17,833        377,157       394,491        (22,024)        767,457
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CHARGES AND OTHER ASSETS
  Deferred income taxes..........................        3,305        128,807            --        (81,565)         50,547
  Investments in debt and equity securities......           --          3,548        65,556            601          69,705
  Deferred swap losses and receivables...........           --         63,147            --             --          63,147
  Deferred environmental costs...................        2,604             --        28,169             --          30,773
  Prepaid benefit costs..........................           --             --       113,879         (2,104)        111,775
  Other..........................................        9,401         26,870        59,007          3,662          98,940
                                                    ----------     ----------    ----------    -----------      ----------
                                                        15,310        222,372       266,611        (79,406)        424,887
                                                    ----------     ----------    ----------    -----------      ----------
INVESTMENTS IN AND ADVANCES TO JOINT VENTURES AND
  SUBSIDIARIES...................................    1,550,770        782,471        19,343     (1,549,353)        803,231
                                                    ----------     ----------    ----------    -----------      ----------
PROPERTY, PLANT AND EQUIPMENT, at cost...........       48,681      1,103,716     2,889,020             --       4,041,417
  Less -- Accumulated depreciation and
    depletion....................................       17,210        229,944     1,396,940             --       1,644,094
                                                    ----------     ----------    ----------    -----------      ----------
                                                        31,471        873,772     1,492,080             --       2,397,323
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,615,384     $2,255,772    $2,172,525    $(1,650,783)     $4,392,898
                                                    ==========     ==========    ==========    ===========      ==========
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
  Accounts payable...............................   $    4,123     $  218,851    $   98,891    $   (17,516)     $  304,349
  Notes payable..................................      260,771        137,762       221,169           (851)        618,851
  Current portion of long-term debt and capital
    lease obligations............................           --        211,433        58,288             --         269,721
  Federal income, property and other taxes
    payable......................................        1,441          6,965        61,059             --          69,465
  Deferred gas cost recovery revenues............           --             --        14,980             --          14,980
  Gas payable....................................           --         17,332        25,337             --          42,669
  Customer deposits..............................           22             --        18,769             --          18,791
  Other..........................................       18,337         25,276        67,222         (2,525)        108,310
                                                    ----------     ----------    ----------    -----------      ----------
                                                       284,694        617,619       565,715        (20,892)      1,447,136
                                                    ----------     ----------    ----------    -----------      ----------
DEFERRED CREDITS AND OTHER LIABILITIES
  Deferred income taxes..........................      (10,308)            --        88,567        (78,259)             --
  Unamortized investment tax credit..............          272             --        29,784             --          30,056
  Tax benefits amortizable to customers..........           --             --       130,120             --         130,120
  Deferred swap gains and payables...............           --         62,956            --             --          62,956
  Accrued environmental costs....................        3,000             --        32,000             --          35,000
  Minority interest..............................           --          2,697         8,201             --          10,898
  Other..........................................       10,435         15,741        51,460         (2,197)         75,439
                                                    ----------     ----------    ----------    -----------      ----------
                                                         3,399         81,394       340,132        (80,456)        344,469
                                                    ----------     ----------    ----------    -----------      ----------
LONG-TERM DEBT, including capital lease
  obligations....................................           --        687,333       619,835             --       1,307,168
                                                    ----------     ----------    ----------    -----------      ----------
REDEEMABLE PREFERRED SECURITIES OF
  SUBSIDIARIES...................................      502,203             --            --             --         502,203
                                                    ----------     ----------    ----------    -----------      ----------
COMMON SHAREHOLDERS' EQUITY
  Common stock...................................          797              5        10,300        (10,305)            797
  Additional paid-in capital.....................      832,966      1,071,390       230,399     (1,301,789)        832,966
  Retained earnings (deficit)....................       13,613       (185,393)      406,144       (237,341)         (2,977)
  Accumulated other comprehensive loss...........           --        (16,576)           --             --         (16,576)
  Yield enhancement, contract and issuance
    costs........................................      (22,288)            --            --             --         (22,288)
                                                    ----------     ----------    ----------    -----------      ----------
                                                       825,088        869,426       646,843     (1,549,435)        791,922
                                                    ----------     ----------    ----------    -----------      ----------
                                                    $1,615,384     $2,255,772    $2,172,525    $(1,650,783)     $4,392,898
                                                    ==========     ==========    ==========    ===========      ==========
</TABLE>

                                       36
<PAGE>   39

           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Concluded)
                CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                         MCN AND                             ELIMINATIONS
                                                          OTHER                                  AND        CONSOLIDATED
                                                       SUBSIDIARIES    MCNIC      MICHCON     RECLASSES        TOTAL
                                                       ------------   --------   ---------   ------------   ------------
(in Thousands)                                                         THREE MONTHS ENDED MARCH 31, 1999
                                                       -----------------------------------------------------------------
<S>                                                    <C>            <C>        <C>         <C>            <C>
NET CASH FLOW FROM OPERATING ACTIVITIES..............    $ 20,753     $ 27,288   $ 179,713     $(24,885)     $ 202,869
                                                         --------     --------   ---------     --------      ---------
CASH FLOW FROM FINANCING ACTIVITIES
  Notes payable, net.................................     (23,009)      51,066    (113,269)       1,000        (84,212)
  Capital paid to affiliates, net....................          --      (28,408)         --       28,408             --
  Dividends paid.....................................     (19,791)          --     (17,500)      17,500        (19,791)
  Preferred securities dividends paid................      (5,125)          --          --        5,125             --
  Issuance of common stock...........................         226           --          --           --            226
  Reacquisition of common stock......................        (977)          --          --           --           (977)
  Long-term commercial paper and bank borrowings,
    net..............................................          --       92,344          --           --         92,344
  Retirement of long-term debt and preferred
    securities.......................................          --      (81,847)     (5,934)          --        (87,781)
                                                         --------     --------   ---------     --------      ---------
    Net cash provided from (used for) financing
      activities.....................................     (48,676)      33,155    (136,703)      52,033       (100,191)
                                                         --------     --------   ---------     --------      ---------
CASH FLOW FROM INVESTING ACTIVITIES
  Capital expenditures...............................        (381)     (56,730)    (24,209)          --        (81,320)
  Acquisitions.......................................          --       (1,602)         --           --         (1,602)
  Investment in debt and equity securities, net......          --          542          --         (554)           (12)
  Investment in joint ventures and subsidiaries......      28,258      (27,482)        (16)     (28,408)       (27,648)
  Sale of property and joint venture interests.......          --       29,560          --         (574)        28,986
  Return of investment in joint ventures.............          --        1,136          --           --          1,136
  Other..............................................         118       (5,054)     (1,876)       2,388         (4,424)
                                                         --------     --------   ---------     --------      ---------
    Net cash provided from (used for) investing
      activities.....................................      27,995      (59,630)    (26,101)     (27,148)       (84,884)
                                                         --------     --------   ---------     --------      ---------
NET INCREASE IN CASH AND CASH EQUIVALENTS............          72          813      16,909           --         17,794
CASH AND CASH EQUIVALENTS, JANUARY 1.................       1,400        9,036       6,603           --         17,039
                                                         --------     --------   ---------     --------      ---------
CASH AND CASH EQUIVALENTS, MARCH 31..................    $  1,472     $  9,849   $  23,512     $     --      $  34,833
                                                         ========     ========   =========     ========      =========
</TABLE>

<TABLE>
<CAPTION>
                                                                       THREE MONTHS ENDED MARCH 31, 1998
                                                       -----------------------------------------------------------------
<S>                                                    <C>            <C>        <C>         <C>            <C>
NET CASH FLOW FROM OPERATING ACTIVITIES..............    $ 17,826     $(29,269)  $ 170,119     $ (3,452)     $ 155,224
                                                         --------     --------   ---------     --------      ---------
CASH FLOW FROM FINANCING ACTIVITIES
  Notes payable, net.................................          --       (7,708)   (124,597)      (6,313)      (138,618)
  Capital contributions paid to affiliates, net......          --      (17,076)         --       17,076             --
  Dividends paid.....................................     (20,455)          --          --           --        (20,455)
  Preferred securities dividends paid................      (9,754)          --          --        9,754             --
  Issuance of common stock...........................       5,584           --          --           --          5,584
  Issuance of long-term debt.........................          --      204,609          --           --        204,609
  Long-term commercial paper, net....................          --      (90,357)         --           --        (90,357)
  Retirement of long-term debt.......................          --         (409)     (4,772)          --         (5,181)
  Other..............................................          --        3,634          --           --          3,634
                                                         --------     --------   ---------     --------      ---------
    Net cash provided from (used for) financing
      activities.....................................     (24,625)      92,693    (129,369)      20,517        (40,784)
                                                         --------     --------   ---------     --------      ---------
CASH FLOW FROM INVESTING ACTIVITIES
  Capital expenditures...............................      (1,765)     (80,456)    (38,282)          --       (120,503)
  Acquisitions.......................................          --      (13,232)         --           --        (13,232)
  Investment in debt and equity securities...........          --       46,895        (427)          --         46,468
  Investment in joint ventures and subsidiaries......      16,876      (37,623)         12      (17,075)       (37,810)
  Sale of property and investment in joint
    ventures.........................................          --        9,147          --           --          9,147
  Return of investment in joint ventures.............          --        2,591          --           --          2,591
  Other..............................................          14       (1,584)        677           10           (883)
                                                         --------     --------   ---------     --------      ---------
    Net cash provided from (used for) investing
      activities.....................................      15,125      (74,262)    (38,020)     (17,065)      (114,222)
                                                         --------     --------   ---------     --------      ---------
NET INCREASE (DECREASE) IN CASH AND CASH
  EQUIVALENTS........................................       8,326      (10,838)      2,730           --            218
CASH AND CASH EQUIVALENTS, JANUARY 1.................          23       25,119      14,353           --         39,495
                                                         --------     --------   ---------     --------      ---------
CASH AND CASH EQUIVALENTS, MARCH 31..................    $  8,349     $ 14,281   $  17,083     $     --      $  39,713
                                                         ========     ========   =========     ========      =========
</TABLE>

                                       37
<PAGE>   40

                               OTHER INFORMATION

SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

MCN held its Annual Meeting of Shareholders on April 28, 1999. As of March 1,
1999, the record date for determination of shareholders entitled to vote at the
Annual Meeting, there were 79,790,381 shares outstanding and entitled to vote.
Of these shares, 69,134,295 or 86.6%, were present in person or by proxy, and
10,656,086 shares were not voted.

At the Annual Meeting, shareholders voted:

     1) To elect the following Directors to serve for three year terms:
<TABLE>
<CAPTION>

                                                                                 DIRECTOR                        NUMBER OF SHARES
                                                                            (THREE-YEAR TERMS)                    CONSENTING FOR
                                                                            ------------------                   ----------------
<S>                                                          <C>                                                 <C>
                                                             Stephen E. Ewing................................       67,434,652
                                                             Roger Fridholm..................................       67,429,867
                                                             Helen O. Petrauskas.............................       67,411,783

<CAPTION>
                                                              NUMBER OF SHARES
                                                                WITHHOLDING
                                                                  CONSENT
                                                              ----------------
<S>                                                           <C>
                                                                 1,699,643
                                                                 1,704,428
                                                                 1,722,512
</TABLE>

       James G. Berges, Alfred R. Glancy III, Frank M. Hennessey, Thomas H.
       Jeffs II, Howard F. Sims and Bill M. Thompson did not have terms of
       office expiring in 1999 and continue to serve as directors of the
       corporation. William K. McCrackin retired from the MCN Board effective
       with the 1999 Annual Meeting.

     2) To ratify the appointment of Deloitte & Touche LLP as independent
        auditors for the year ending December 31, 1999, with 67,706,024 shares
        voted for the ratification, 925,232 shares voted against, and
        abstentions of 503,039 shares.

                                       38
<PAGE>   41

EXHIBITS AND REPORTS ON FORM 8-K

(a) Exhibits

<TABLE>
<CAPTION>
      EXHIBIT
      NUMBER        DESCRIPTION
      -------       -----------
     <S>           <C>
       12-1         Computation of Ratio of Earnings to Fixed Charges for MCN
                    Energy Group Inc.*
       12-2         Computation of Ratio of Earnings to Fixed Charges for MCN
                    Investment Corporation*
       27-1         Financial Data Schedule -- 1998.*
       27-2         Financial Data Schedule -- 1997.*

*  Indicates documents were previously filed.
</TABLE>

(b) Reports on Form 8-K

     MCN filed a report on Form 8-K dated May 17, 1999, under Item 5, which
     included a press release issued by MCN Energy Group Inc. on May 17, 1999
     that announced it would delay the filing of its 1999 first quarter Form
     10-Q with the Securities and Exchange Commission.

                                       39
<PAGE>   42

                                   SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                                            MCN ENERGY GROUP INC.

Date: June 21, 1999                          By:    /s/ GERARD KABZINSKI
                                              ----------------------------------
                                                        Gerard Kabzinski
                                                  Vice President and Controller

                                       40