================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2000

                                       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 1-4874


                         COLORADO INTERSTATE GAS COMPANY
             (Exact name of registrant as specified in its charter)



                Delaware                                        84-0173305
    (State or other jurisdiction of                          (I.R.S. Employer
     incorporation or organization)                         Identification No.)


         Two North Nevada Avenue
       Colorado Springs, Colorado                               80903-1727
(Address of principal executive offices)                        (Zip Code)



       Registrant's telephone number, including area code: (719) 473-2300


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



     Registrant meets the conditions set forth in General Instructions H(1)(a)
and (b) of Form 10-Q and is therefore filing this Report with reduced disclosure
format.

     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, and (2) has been subject to such filing
requirements for the past 90 days. Yes X No _____

     As of October 31, 2000, there were outstanding 10 shares of common stock of
the Registrant, $5.00 par value per share, its only class of common stock. None
of the voting stock of the Registrant is held by non-affiliates.


================================================================================

<PAGE>

                                     PART I

                              FINANCIAL INFORMATION

Item 1.    Financial Statements.

      The financial statements of Colorado Interstate Gas Company and its
subsidiaries (the "Company" or "Colorado") are presented herein and are
unaudited, except for balances as of December 31, 1999, and therefore, are
subject to year-end adjustments; however, all adjustments which are, in the
opinion of management, necessary for a fair statement of the results of
operations for the periods covered have been made. The adjustments which have
been made are of a normal recurring nature. Such results are not necessarily
indicative of results to be expected for the year due to seasonal variations and
market conditions affecting natural gas sales and transportation services.




                COLORADO INTERSTATE GAS COMPANY AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
                             (Thousands of Dollars)


<TABLE>
<CAPTION>
                                                                                 September 30,      December 31,
                                     ASSETS                                         2000                1999
                                                                               ---------------     --------------
                                                                                  (Unaudited)
<S>                                                                             <C>                <C>
Current Assets:
   Cash....................................................................     $          625     $          731
   Notes receivable from affiliates........................................            324,269            297,201
   Accounts receivable.....................................................             28,989             48,808
   Accounts receivable from affiliates.....................................             16,264             40,031
   Materials and supplies..................................................              8,205              8,303
   Prepaid expenses........................................................                100                419
   Current portion of deferred income taxes................................             40,644             39,505
                                                                                --------------     --------------
                                                                                       419,096            434,998
                                                                                --------------     --------------

Plant, Property and Equipment, at cost:
   Gas pipeline............................................................          1,284,761          1,248,949
   Gas and oil properties, at full-cost....................................            102,096             96,650
                                                                                --------------     --------------
                                                                                     1,386,857          1,345,599

   Accumulated depreciation, depletion and amortization....................            728,695            704,790
                                                                                --------------     --------------
                                                                                       658,162            640,809
                                                                                --------------     --------------

Other Assets:
   Investments in related parties..........................................             64,336             64,336
   Other deferred charges..................................................             58,272             45,504
                                                                                --------------     --------------
                                                                                       122,608            109,840
                                                                                --------------     --------------

                                                                                $    1,199,866     $    1,185,647
                                                                                ==============     ==============
</TABLE>



                 See Notes to Consolidated Financial Statements.


                                      - 1 -

<PAGE>

                COLORADO INTERSTATE GAS COMPANY AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
                             (Thousands of Dollars)


<TABLE>
<CAPTION>
                                                                                 September 30,      December 31,
                      LIABILITIES AND STOCKHOLDER'S EQUITY                          2000                1999
                                                                               ---------------     --------------
                                                                                  (Unaudited)
<S>                                                                            <C>                  <C>
Current Liabilities:
   Notes payable to affiliates.............................................    $           -        $      2,452
   Accounts payable and accrued expenses...................................          116,280             119,215
   Accounts payable to affiliates..........................................           13,548              20,278
   Taxes on income.........................................................           10,313              21,526
                                                                               -------------        ------------
                                                                                     140,141             163,471
                                                                               -------------        ------------

Debt:
   Long-term debt..........................................................          279,649             279,594
                                                                               -------------        ------------

Deferred Credits:
   Deferred income taxes...................................................          125,600             118,168
   Other...................................................................           43,200              40,888
                                                                               -------------        ------------
                                                                                     168,800             159,056
                                                                               -------------        ------------

Common Stock and Other Stockholder's Equity:
   Common stock, $5 par value, authorized 10,000 shares; issued and
      outstanding 10 shares at stated value................................           27,561              27,561
   Additional paid-in capital..............................................           19,037              19,037
   Retained earnings.......................................................          564,678             536,928
                                                                               -------------        ------------
                                                                                     611,276             583,526
                                                                               -------------        ------------

                                                                               $   1,199,866        $  1,185,647
                                                                               =============        ============
</TABLE>



                 See Notes to Consolidated Financial Statements.


                                      - 2 -

<PAGE>

                COLORADO INTERSTATE GAS COMPANY AND SUBSIDIARIES
                       STATEMENT OF CONSOLIDATED EARNINGS
                             (Thousands of Dollars)


<TABLE>
<CAPTION>
                                                                     Three Months Ended        Nine Months Ended
                                                                        September 30,            September 30,
                                                                   ----------------------   ---------------------
                                                                      2000        1999        2000         1999
                                                                   ----------  ----------   ---------   ---------
                                                                         (Unaudited)              (Unaudited)
<S>                                                                <C>         <C>          <C>         <C>
Revenues:
   Operating revenues:
      Nonaffiliates.............................................   $   50,132  $   45,415   $ 187,171   $ 161,834
      Affiliates................................................       29,061      24,444      68,987      65,260
                                                                   ----------  ----------   ---------   ---------
                                                                       79,193      69,859     256,158     227,094
   Other income - net...........................................        5,571       3,924      16,789      10,901
                                                                   ----------  ----------   ---------   ---------
                                                                       84,764      73,783     272,947     237,995
                                                                   ----------  ----------   ---------   ---------

Costs and Expenses:
   Operation and maintenance....................................       45,705      39,624     123,855     106,528
   Depreciation, depletion and amortization.....................        8,394       7,742      24,956      23,440
   Interest expense.............................................        6,060       6,192      18,464      18,565
   Taxes on income..............................................        9,028       7,723      38,922      32,140
                                                                   ----------  ----------   ---------   ---------
                                                                       69,187      61,281     206,197     180,673
                                                                   ----------  ----------   ---------   ---------

Net Earnings....................................................   $   15,577  $   12,502   $  66,750   $  57,322
                                                                   ==========  ==========   =========   =========
</TABLE>



                 See Notes to Consolidated Financial Statements.


                                      - 3 -

<PAGE>

                COLORADO INTERSTATE GAS COMPANY AND SUBSIDIARIES
                      STATEMENT OF CONSOLIDATED CASH FLOWS
                             (Thousands of Dollars)


<TABLE>
<CAPTION>
                                                                                            Nine Months Ended
                                                                                              September 30,
                                                                                      ---------------------------
                                                                                          2000            1999
                                                                                      -----------      ----------
                                                                                               (Unaudited)
<S>                                                                                   <C>              <C>
Cash Flow From Operating Activities:
   Net earnings ..................................................................    $    66,750      $   57,322
   Add items not requiring cash:
      Depreciation, depletion and amortization....................................         24,956          23,440
      Deferred income taxes.......................................................          6,265           7,894

   Working capital and other changes, excluding changes relating to cash and
      nonoperating activities:
         Receivables..............................................................         19,819          11,297
         Receivables from affiliates..............................................         23,767          (1,300)
         Materials and supplies...................................................             98             108
         Prepaid expenses.........................................................            319             304
         Accounts payable and accrued expenses....................................         (2,935)          3,745
         Accounts payable to affiliates...........................................         (6,730)        (20,040)
         Taxes on income..........................................................        (11,213)        (13,609)
         Other....................................................................         (9,255)           (745)
                                                                                      -----------      ----------
                                                                                          111,841          68,416
                                                                                      -----------      ----------

Cash Flow from Investing Activities:
   Purchases of plant, property and equipment.....................................        (43,572)        (26,814)
   Proceeds from sale of plant, property and equipment............................            145           1,022
   Investments in related parties.................................................              -          11,633
   Net increase in notes receivable from affiliates...............................        (27,068)        (52,247)
                                                                                      -----------      ----------
                                                                                          (70,495)        (66,406)
                                                                                      -----------      ----------

Cash Flow from Financing Activities:
   Net decrease in notes payable to affiliates....................................         (2,452)           (964)
   Common dividends paid..........................................................        (39,000)              -
                                                                                      -----------      ----------
                                                                                          (41,452)           (964)
                                                                                      -----------      ----------

Net (Decrease) Increase in Cash...................................................           (106)          1,046

Cash at Beginning of Period.......................................................            731             109
                                                                                      -----------      ----------

Cash at End of Period.............................................................    $       625      $    1,155
                                                                                      ===========      ==========
</TABLE>



                 See Notes to Consolidated Financial Statements.


                                      - 4 -

<PAGE>

                COLORADO INTERSTATE GAS COMPANY AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.    Summary of Significant Accounting Policies

      For additional information relative to operations and financial position,
reference is made to the Company's Annual Report on Form 10-K for the fiscal
year ended December 31, 1999. Certain minor reclassifications of prior period
statements have been made to conform with current reporting practices. The
effect of the reclassifications was not material to the Company's consolidated
results of operations, financial position or cash flows.

      The Financial Accounting Standards Board has issued Statement of Financial
Accounting Standards No. 133, "Accounting for Derivative Instruments and Hedging
Activities" ("FAS 133"), as amended by Statements of Financial Accounting
Standards No. 137 and No. 138, to be effective for all fiscal quarters of fiscal
years beginning after June 15, 2000. FAS 133 establishes accounting and
reporting standards for derivative instruments, including derivative instruments
embedded in other contracts, and derivative instruments used for hedging
activities. It requires that an entity recognize all derivatives as either
assets or liabilities in the statement of financial position and measure those
instruments at fair value. The corresponding offset for the change in fair value
of the derivative instruments will be to income or other comprehensive income,
depending on their designation, their intended use, or their ability to qualify
as hedges under FAS 133. The Company will adopt FAS 133 beginning January 1,
2001, and will apply the standard to all derivative instruments that exist on
that date except for derivative instruments embedded in other contracts. As
provided for in FAS 133, the Company will apply the provisions of the standard
to derivative instruments embedded in other contracts issued, acquired, or
substantially modified after December 31, 1998. The Company is continuing to
study the impact of FAS 133 and has not yet quantified the effects, if any, on
its financial statements.

      The Company may periodically enter into swaps, futures and other contracts
to hedge the price risk of natural gas anticipated to be sold. The Company
defers the impact of changes in the market value of these contracts until such
time as the hedged transaction is completed. At that time, the impact of the
changes in the fair market value of these contracts is recognized in income.

      Supplemental information relative to the Statement of Consolidated Cash
Flows includes the following: cash payments the Company made for interest and
financing fees, net of amounts capitalized, were $12.4 million and $12.3 million
for the nine-month periods ended September 30, 2000 and 1999, respectively. Cash
payments for income taxes amounted to $43.9 million and $37.9 million for the
nine-month periods ended September 30, 2000 and 1999, respectively.




                                      - 5 -

<PAGE>

2.    Income Taxes

      Provisions for income taxes are composed of the following (thousands of
dollars):

<TABLE>
<CAPTION>
                                                                     Three Months Ended        Nine Months Ended
                                                                        September 30,            September 30,
                                                                   ----------------------   ---------------------
                                                                      2000        1999        2000         1999
                                                                   ----------  ----------   ---------   ---------
                                                                         (Unaudited)              (Unaudited)
   <S>                                                             <C>          <C>         <C>         <C>
   Current Income Taxes:
      Federal...................................................   $    5,627   $   5,757   $  30,370   $  22,444
      State.....................................................          520         826       2,287       1,802
                                                                   ----------   ---------   ---------   ---------
                                                                        6,147       6,583      32,657      24,246
                                                                   ----------   ---------   ---------   ---------

   Deferred Income Taxes
      Federal...................................................        2,593       1,073       5,650       7,123
      State.....................................................          288          67         615         771
                                                                   ----------   ---------   ---------   ---------
                                                                        2,881       1,140       6,265       7,894
                                                                   ----------   ---------   ---------   ---------

   Taxes on Income..............................................   $    9,028   $   7,723   $  38,922   $  32,140
                                                                   ==========   =========   =========   =========
<FN>

      Interim period provisions for income taxes are based on estimated
effective annual income tax rates.
</FN>
</TABLE>

3.    Common Stock

      All of the issued and outstanding common stock of the Company is owned by
Coastal Natural Gas Company, a wholly owned subsidiary of The Coastal
Corporation ("Coastal"). Therefore, earnings and cash dividends per common share
have no significance and are not presented.

4.    Segment Information

      The Company's operating revenues from external customers and intersegment
revenues and earnings before interest and income taxes for the three and nine
months ended September 30, 2000 and 1999 are shown as follows (thousands of
dollars):

<TABLE>
<CAPTION>
                                                                     Three Months Ended        Nine Months Ended
                                                                        September 30,            September 30,
                                                                   ----------------------   ---------------------
                                                                      2000        1999        2000         1999
                                                                   ----------  ----------   ---------   ---------
                                                                         (Unaudited)              (Unaudited)
<S>                                                                <C>         <C>          <C>         <C>
Operating Revenues
   Natural gas..................................................   $   75,477  $   64,455   $ 245,301   $ 213,792
   Exploration and production...................................        3,716       5,422      10,857      13,343
   Exploration and production intersegment revenue
     eliminations...............................................            -         (18)          -         (41)
                                                                   ----------  ----------   ---------   ---------
      Consolidated Totals.......................................   $   79,193  $   69,859   $ 256,158   $ 227,094
                                                                   ==========  ==========   =========   =========

Earnings Before Interest and Income Taxes
   Natural gas..................................................   $   28,037  $   24,509   $ 116,611   $ 105,028
   Exploration and production...................................        2,628       1,908       7,525       2,999
                                                                   ----------  ----------   ---------   ---------
      Consolidated Totals.......................................   $   30,665  $   26,417   $ 124,136   $ 108,027
                                                                   ==========  ==========   =========   =========
</TABLE>



                                      - 6 -

<PAGE>

5.    Litigation, Environmental and Regulatory Matters

      Litigation Matters

      In December 1992, certain of Colorado's natural gas lessors in the West
Panhandle Field filed a complaint in the U.S. District Court, Northern District
of Texas, claiming underpayment of royalties, breach of fiduciary duty, fraud
and negligent misrepresentation. Management believes that Colorado has numerous
defenses to the lessors' claims, including (i) that the royalties were properly
paid, (ii) that the majority of the claims were released by written agreement,
and (iii) that the majority of the claims are barred by the statute of
limitations. In March of 1995, the trial court granted a partial summary
judgment in favor of Colorado, holding that the four-year statute of limitations
had not been tolled and the releases are valid and dismissing all tort claims
and claims for breach of any duty of disclosure. The remaining claim for
underpayment of royalties was tried to a jury which, in May 1995, made findings
favorable to Colorado. On June 7, 1995, the trial court entered a judgment that
the lessors recover no monetary damages from Colorado and permanently estopping
the lessors from asserting any claim based on an interpretation of the contract
different than that asserted by Colorado in the litigation. The lessors' motion
for new trial was denied on July 18, 1997, and both parties filed appeals. On
June 7, 1996, the same plaintiffs sued Colorado in state court in Amarillo,
Texas, for underpayment of royalties. Colorado removed the second lawsuit to
federal court which granted a stay of the second lawsuit pending the outcome of
the first lawsuit. The Fifth Circuit Court of Appeals heard oral arguments in
December 1998 and affirmed the trial court judgment in September 2000. The
plaintiffs have filed a motion for rehearing of the September 2000 decision.

      Two legal proceedings, one in federal court and the other in state court,
have been instituted against a number of gas pipeline companies and their
affiliates, including Colorado, Coastal and several of Coastal's other
subsidiaries. The plaintiffs in each suit seek damages for the alleged
undermeasurement of the heating value and the volume of natural gas. In the
federal proceeding, Jack Grynberg filed 77 separate False Claim Act suits in
September 1997 against natural gas transmission companies and producers,
gatherers, and processors of natural gas, seeking unspecified damages which
could include treble damages for the maximum period permitted by law
(potentially as much as ten years) and penalties of up to $10,000 per false
claim. In addition to the measurement claims, these suits also allege that the
defendants undervalued the gas in paying royalties. The Coastal defendants were
sued in the U.S. District Courts of Colorado and the Eastern District of
Michigan. In April 1999, the U.S. Department of Justice notified the Company
that the United States would not intervene in these cases at that time. The
MultiDistrict Litigation Panel has consolidated the Grynberg suits with several
other Grynberg cases for pre-trial proceedings in Wyoming. The defendants filed
a motion to dismiss which was argued in March 2000, and the parties are awaiting
the Court's decision. The United States has filed a motion to dismiss part of
the Grynberg case.

      In the state proceedings, the Quinque Operating Company, on behalf of
itself and subclasses of gas producers, royalty owners, overriding royalty
owners, and state taxing authorities, in May 1999, instituted a legal proceeding
in State Court in Stevens County, Kansas, against over 200 gas companies,
including Colorado and several other Coastal subsidiaries. The Quinque suit
seeks unspecified actual, punitive and treble damages for the alleged
undermeasurement of all natural gas measured in the United States from
non-federal and non-Indian lands since 1974. The plaintiffs are seeking
certification of a national class of all similarly situated gas producers,
royalty owners, overriding royalty owners, and state taxing authorities. The
suit was removed to the U.S. District Court for the District of Kansas. The
plaintiffs filed a motion to remand the case back to the state court. The
MultiDistrict Litigation Panel has transferred the Quinque suit to Wyoming and
consolidated it with the Grynberg proceedings as a result of a motion filed by
several of the defendants in the Quinque suit.

      Other lawsuits and other proceedings which have arisen in the ordinary
course of business are pending or threatened against the Company or its
subsidiaries. Although no assurances can be given and no determination can be
made at this time as to the outcome of any particular lawsuit or proceeding, the
Company believes there are meritorious defenses to substantially all of the
above claims and that any liability which may finally be determined should not
have a material adverse effect on the Company's consolidated financial position
or results of operations.



                                      - 7 -

<PAGE>

      Environmental Matters

      The Company's operations are subject to extensive and evolving federal,
state and local environmental laws and regulations which may affect such
operations and costs as a result of their effect on the construction, operation,
and maintenance of its pipeline and production facilities. Compliance with such
laws and regulations can be costly. Additionally, governmental authorities may
enforce the laws and regulations with a variety of civil and criminal
enforcement measures, including monetary penalties and remediation requirements.

      Future information and developments, including legislative and enforcement
developments, will require the Company to continually reassess the expected
impact of these environmental matters. However, the Company has evaluated its
total environmental exposure based on currently available data, including its
potential joint and several liability, and believes that compliance with all
applicable laws and regulations will not have a material adverse impact on the
Company's consolidated financial position or results of operations.

      Regulatory Matters

      Certain regulatory issues remain unresolved among the Company, its
customers, its suppliers and the Federal Energy Regulatory Commission. The
Company has made provisions which represent management's assessment of the
ultimate resolution of these issues. As a result, the Company anticipates that
these regulatory matters will not have a material adverse effect on its
consolidated financial position or results of operations. While the Company
estimates the provisions to be adequate to cover potential adverse rulings on
these and other issues, it cannot estimate when each of these issues will be
resolved.

6.    Merger

      Coastal and El Paso Energy Corporation ("El Paso Energy") announced, on
January 18, 2000, the execution of definitive agreements for the merger of
Coastal and a subsidiary of El Paso Energy. Each share of Coastal common stock
and Class A common stock will be converted on a tax-free basis (except for cash
paid in lieu of fractional shares) into 1.23 shares of El Paso Energy common
stock. The outstanding convertible preferred stock of Coastal will be exchanged
tax free (except for cash paid in lieu of fractional shares) for El Paso Energy
common stock on the same basis as if the preferred stock had been converted into
Coastal common stock immediately prior to the merger. On May 5, 2000, the merger
was approved by the shareholders of Coastal and El Paso Energy. It is expected
that the merger will be completed during the fourth quarter of 2000 and be
accounted for as a pooling of interests. The merger is subject to additional
conditions, particularly federal regulatory approval.


Item 2.  Management's Discussion and Analysis of Financial Condition
         and Results of Operations.

      This report includes certain forward-looking statements. The
forward-looking statements reflect the Company's expectations, objectives and
goals with respect to future events and financial performance, and are based on
assumptions and estimates which the Company believes are reasonable. However,
actual results could differ materially from anticipated results. Important
factors which may affect the actual results include, but are not limited to,
commodity prices, political developments, market and economic conditions,
industry competition, the weather, changes in financial markets and changing
legislation and regulations. The forward-looking statements contained in this
Report are intended to qualify for the safe harbor provisions of Section 21E of
the Securities Exchange Act of 1934, as amended.

      The Notes to Consolidated Financial Statements contain information that is
pertinent to the following analysis.

      The information required by this Item is presented in a reduced disclosure
format pursuant to General Instruction (H) of Form 10-Q.



                                      - 8 -

<PAGE>

                              Results of Operations

      The change in the Company's earnings for the three- and nine-month periods
ended September 30, 2000, in comparison to the corresponding periods in 1999, is
a result of the following:

     Operating Revenues. The operating revenues by segment were as follows
(thousands of dollars):

<TABLE>
<CAPTION>
                                                                     Three Months Ended        Nine Months Ended
                                                                        September 30,            September 30,
                                                                   ----------------------   ---------------------
                                                                      2000        1999        2000         1999
                                                                   ----------  ----------   ---------   ---------
                                                                         (Unaudited)              (Unaudited)
        <S>                                                        <C>         <C>          <C>         <C>
        Natural gas.............................................   $   75,477  $   64,455   $ 245,301   $ 213,792
        Exploration and production..............................        3,716       5,422      10,857      13,343
        Eliminations............................................            -         (18)          -         (41)
                                                                   ----------  ----------   ---------   ---------

                                                                   $   79,193  $   69,859   $ 256,158   $ 227,094
                                                                   ==========  ==========   =========   =========
</TABLE>

     Earnings Before Interest and Income Taxes. The earnings before interest and
income taxes by segment was as follows (thousands of dollars):

<TABLE>
<CAPTION>
                                                                     Three Months Ended        Nine Months Ended
                                                                        September 30,            September 30,
                                                                   ----------------------   ---------------------
                                                                      2000        1999        2000         1999
                                                                   ----------  ----------   ---------   ---------
                                                                         (Unaudited)              (Unaudited)
        <S>                                                        <C>         <C>          <C>         <C>
        Natural gas.............................................   $   28,037  $   24,509   $ 116,611   $ 105,028
        Exploration and production..............................        2,628       1,908       7,525       2,999
                                                                   ----------  ----------   ---------   ---------

                                                                   $   30,665  $   26,417   $ 124,136   $ 108,027
                                                                   ==========  ==========   =========   =========
</TABLE>

      Natural Gas. The increase in operating revenues of $11.0 million for the
three months ended September 30, 2000, from the comparable 1999 period is due to
a $5.8 million increase related to average gas sales prices, a $1.8 million
increase related to extracted products revenue, a $1.3 million increase related
to gas transportation revenues, a $1.1 million increase in gas gathering
revenues and other net increases of $1.0 million. The increase in operating
revenues of $31.5 million for the nine months ended September 30, 2000 from the
comparable 1999 period is due to a $19.9 million increase related to average gas
sales prices, $5.8 million of which related to a gas sales contract balancing
adjustment, a $6.6 million increase related to extracted products revenue, a
$2.8 million increase related to incidental gasoline and oil sales, a $2.7
million increase related to increased gas transportation revenues, a $1.9
million increase in gas gathering revenues and other net increases of $.8
million, partially offset by a $3.2 million decrease related to gas sales
volumes.

      Other income increased $1.7 million for the three-month period and $5.5
million for the nine-month period ended September 30, 2000, from the respective
periods in 1999 due to increased interest income from affiliates.

      Operation and maintenance expenses increased by $7.3 million for the three
months ended September 30, 2000, from the comparable period in 1999 due to a
$5.5 million increase related to gas royalties, transportation and net gas
system balancing requirements, a $1.0 million increase in salaries and benefits
and other net increases of $.8 million. Operation and maintenance expenses
increased by $20.8 million for the nine months ended September 30, 2000, from
the comparable period in 1999 due to a $10.4 million increase related to gas
royalties, transportation and net gas system balancing requirements, a $5.8
million increase in salaries, benefits and a non-recurring benefits adjustment
made in 1999 and other net increases of $4.6 million.



                                      - 9 -

<PAGE>

      Depreciation, depletion and amortization increased $1.9 million for the
three-month and $4.6 million for the nine-month periods ended September 30,
2000, from the comparable periods in 1999 due primarily to increased depreciable
plant.

      Exploration and Production. The decrease in operating revenues of $1.7
million for the three months ended September 30, 2000, from the comparable 1999
period is primarily due to a $2.9 million decrease related to gas sales volumes
and other net decreases of $.6 million, partially offset by a $1.8 million
increase related to average natural gas sales prices. The decrease in operating
revenues of $2.5 million for the nine months ended September 30, 2000, from the
comparable 1999 period is primarily due to a $6.7 million decrease related to
gas sales volumes and other net decreases of $.3 million, partially offset by a
$4.5 million increase related to average natural gas sales prices.

      Other income increased $.4 million for the nine-month period ended
September 30, 2000, from the respective 1999 period as a result of increased
interest income from affiliates.

      Operation and maintenance expenses decreased by $1.2 million for the
three-month period and $3.5 million for the nine-month period ended September
30, 2000, from the respective 1999 periods primarily as a result of lower
production volumes and decreased ad valorem taxes and management service fees.

      Depreciation, depletion and amortization expenses decreased by $1.2
million for the three-month period and $3.1 million for the nine-month period
ended September 30, 2000, from the comparable 1999 periods due to lower
production volumes.

      Taxes on Income. The income tax increase for the three-month and
nine-month periods ended September 30, 2000, compared to the same periods in
1999 is due primarily to increased earnings before income taxes and changes in
effective income tax rates.




                                     - 10 -

<PAGE>

                                     PART II

                                OTHER INFORMATION

Item 1.   Legal Proceedings.

          The information required hereunder is incorporated by reference into
Part II of this Report from Note 5 of the Notes to Consolidated Financial
Statements set forth in Part I of this Report.

Item 2.   Changes in Securities.

          None.

Item 3.   Defaults Upon Senior Securities.

          None.

Item 4.   Submission of Matters to a Vote of Security Holders.

          None.

Item 5.   Other Information.

          None.

Item 6.   Exhibits and Reports on Form 8-K.

          (a) Exhibits.

              (27)  Financial Data Schedule.

          (b) Reports on Form 8-K.

              No reports on Form 8-K were filed during the quarter ended
              September 30, 2000.


                                   SIGNATURES

          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.

                                               COLORADO INTERSTATE GAS COMPANY
                                                         (Registrant)



Date:  November 10, 2000                  By:            DAN A. HOMEC
                                             ----------------------------------
                                                         Dan A. Homec
                                                   Assistant Vice President
                                                        and Controller
                                                  (As Authorized Officer and
                                                   Chief Accounting Officer)


                                     - 11 -

<PAGE>

                                INDEX TO EXHIBITS


Exhibit
Number                            Description
-------------------------------------------------------------------------------

27         Financial Data Schedule


                                     - 12 -