UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 
 FORM 11-K
  þ
    
    Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934
 For the fiscal year ended December 31, 2010
 OR
 o
    
    Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934
 Commission file number: 0-49807
 A.
    
    Full title of the plan and the address of the plan, if different from that of
the issuer named below:
 WASHINGTON GAS LIGHT COMPANY
SAVINGS PLAN
 B.
    
    Name of issuer of the securities held pursuant to the plan and the address
of its principal executive office:




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Washington Gas Light Company Savings Plan
For the Fiscal Year Ended December 31, 2010
 Table of Contents
 Report of Independent Registered Public Accounting Firm
    
    
    1Statements of Net Assets Available for Benefits
    
    
    2Statements of Changes in Net Assets Available for Benefits
    
    
    3Notes to Financial Statements
    
    
    4Form 5500, Schedule H, Line 4i  Schedule of Assets (Held at End of Year)
as of December 31, 2010
    
    
    15Signatures
    
    
    16Exhibit 23  Consent of Independent Registered Public Accounting Firm
    
    
    17




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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
 
      
 -1-




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Washington Gas Light Company Savings Plan
Statements of Net Assets Available for Benefits
 2010
    
    
    2009AssetsInvestments, at fair value:Registered investment companies
    
    $
    61,723,070
    
    
    $
    54,293,312Common/collective trust funds
    
    
    23,017,849
    
    
    
    18,783,955Stable Value Fund
    
    
    30,926,979
    
    
    
    31,615,862WGL Holdings, Inc. Common Stock Fund
    
    
    13,360,433
    
    
    
    12,072,819Total Investments
    
    
    129,028,331
    
    
    
    116,765,948Receivables:Employee contribution
    
    
    103,096
    
    
    
    77,162Employer contribution
    
    
    45,782
    
    
    
    30,591Notes receivable from participants
    
    
    2,028,767
    
    
    
    1,852,801Total Receivables
    
    
    2,177,645
    
    
    
    1,960,554Net Assets Reflecting Investments at Fair Value
    
    
    131,205,976
    
    
    
    118,726,502Adjustment from fair value to contract value for fully
benefit-responsive investment contracts
    
    
    (665,747
    )
    
    
    (63,106
    )Net Assets Available for Benefits
    
    $
    130,540,229
    
    
    $
    118,663,396
 The accompanying notes are an integral part of these statements.
 -2-




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Washington Gas Light Company Savings Plan
Statements of Changes in Net Assets Available for Benefits
 2010
    
    
    2009Investment Income:Net appreciation in fair value of investments
    
    $
    10,110,390
    
    
    $
    15,640,329Net appreciation in contract value of investments
    
    
    864,962
    
    
    
    819,681Dividend and interest income
    
    
    1,359,944
    
    
    
    1,432,032Total Investment Income
    
    
    12,335,296
    
    
    
    17,892,042Interest income on notes receivable from participants
    
    
    96,465
    
    
    
    106,292Transfer in  from the Washington Gas Light Company
Capital Appreciation Plan
    
    
    1,214,338
    
    
    
    605,289Contributions:Employee
    
    
    4,229,141
    
    
    
    4,081,737Employer
    
    
    2,246,781
    
    
    
    2,040,078Total Contributions
    
    
    6,475,922
    
    
    
    6,121,815Deductions:Benefits paid
    
    
    (8,109,261
    )
    
    
    (9,337,693
    )Administrative expenses
    
    
    (135,927
    )
    
    
    (11,035
    )Total Deductions
    
    
    (8,245,188
    )
    
    
    (9,348,728
    )Net Increase in Net Assets
    
    
    11,876,833
    
    
    
    15,376,710Net Assets Available for Benefits:Beginning of Year
    
    
    118,663,396
    
    
    
    103,286,686End of Year
    
    $
    130,540,229
    
    
    $
    118,663,396
 The accompanying notes are an integral part of these statements.
 -3-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 
 NOTES TO FINANCIAL STATEMENTS
 Note 1Description of the Savings Plan
  General
   Contributions
    -4-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 1Description of the Savings Plan (continued)
     Vesting
  Participant Accounts
  Investments
  Distributions
  -5-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 1Description of the Savings Plan(continued)
  In-Service Withdrawals
  Participant Loans
  Amendment or Termination
  Note 2Significant Accounting Policies
 Basis of Accounting
  Use of Estimates
  -6-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 2Significant Accounting Policies (continued)
 Investment Valuation and Income Recognition
    Reporting of Investment Contracts  (Stable Value Fund)
   Plan Accounting  Defined Contribution Pension Plans
 -7-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 2Significant Accounting Policies (continued)
 Distributions
  Administrative Expenses
  Note 3Tax Status
   Note 4Plan Amendments
  -8-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 5Investments
  2010
    
    
    2009American Funds Growth Fund of America
    
    $
    24,070,499
    
    
    $
    22,425,450PIMCO Total Return Fund
    
    
    7,173,731
    
    
    
    6,377,180Stable Value Fund a/ b/
    
    
    30,261,232
    
    
    
    31,552,756Van Kampen Growth & Income Fund
    
    
    13,903,085
    
    
    
    12,897,168WGL
Holdings, Inc. Common Stock Fund a/
    
    
    13,360,433
    
    
    
    12,072,819
 
 a/
    
    Party-in-interest (see Note 8).b/
    
    At contract value (see Note 2).  2010
    
    
    2009Net appreciation in fair value of:Registered investment companies
    
    $
    6,229,813
    
    
    $
    11,465,457Common/collective trust funds
    
    
    2,950,026
    
    
    
    3,799,866WGL
Holdings, Inc. Common Stock Fund *
    
    
    930,551
    
    
    
    375,006Total
    
    $
    10,110,390
    
    
    $
    15,640,329Net appreciation in contract value of:Stable Value Fund*
    
    $
    864,962
    
    
    $
    819,681Total
    
    $
    864,962
    
    
    $
    819,681
 
 *
    
    Party-in-interest (see Note 8). -9-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 6Fair Value Measurements
  
    
    Level 1  Inputs to the valuation methodology are unadjusted quoted prices for
identical assets or liabilities in active markets that the Plan has the ability to access.
    
    Level 2  Inputs to the valuation methodology include quoted prices for similar assets
or liabilities in active markets, quoted prices for identical or similar assets or liabilities
in inactive markets, inputs other than quoted prices that are observable for the asset or
liability, or inputs that are derived principally from or corroborated by observable market
data by correlation or other means.
    
    Level 3  Inputs to the valuation methodology are unobservable and significant to the
fair value measurement.
 Financial Services  Investment Companies
 -10-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 6Fair Value Measurements (continued)
  December 31, 2010Level 1
    
    Level 2
    
    Level 3
    
    TotalRegistered investment companiesLarge cap funds
    
    $
    24,070,499
    
    
    $
    
    
    
    $
    
    
    
    $
    24,070,499Fixed income
funds
    
    
    21,076,816
    
    
    
    
    
    
    
    
    
    
    
    21,076,816International funds
    
    
    8,280,670
    
    
    
    
    
    
    
    
    
    
    
    8,280,670Small/mid cap funds
    
    
    8,295,085
    
    
    
    
    
    
    
    
    
    
    
    8,295,085Common/collective trust fundsTarget date funds
    
    
    
    
    
    
    16,004,729
    
    
    
    
    
    
    
    16,004,729Large cap
blend funds
    
    
    
    
    
    
    6,094,080
    
    
    
    
    
    
    
    6,094,080Small/mid income funds
    
    
    
    
    
    
    919,040
    
    
    
    
    
    
    
    919,040Stable Value Fund
    
    
    
    
    
    
    
    
    
    
    30,926,979
    
    
    
    30,926,979WGL Holdings, Inc. Common Stock Fund
    
    
    
    
    
    
    13,360,433
    
    
    
    
    
    
    
    13,360,433Total investments, at fair value
    
    $
    61,723,070
    
    
    $
    36,378,282
    
    
    $
    30,926,979
    
    
    $
    129,028,331
 December 31, 2009Level 1
    
    Level 2
    
    Level 3
    
    TotalRegistered investment companiesLarge cap funds
    
    $
    35,322,618
    
    
    $
    
    
    
    $
    
    
    
    $
    35,322,618Fixed income
funds
    
    
    6,377,180
    
    
    
    
    
    
    
    
    
    
    
    6,377,180International funds
    
    
    7,726,205
    
    
    
    
    
    
    
    
    
    
    
    7,726,205Small/mid cap funds
    
    
    4,867,309
    
    
    
    
    
    
    
    
    
    
    
    4,867,309Common/collective trust fundsTarget date funds
    
    
    
    
    
    
    13,834,518
    
    
    
    
    
    
    
    13,834,518Large cap
blend funds
    
    
    
    
    
    
    4,949,437
    
    
    
    
    
    
    
    4,949,437Stable Value Fund
    
    
    
    
    
    
    
    
    
    
    31,615,862
    
    
    
    31,615,862WGL Holdings, Inc. Common Stock Fund
    
    
    
    
    
    
    12,072,819
    
    
    
    
    
    
    
    12,072,819Total investments, at fair value
    
    $
    54,293,312
    
    
    $
    30,856,774
    
    
    $
    31,615,862
    
    
    $
    116,765,948
  Registered investment companies
 Common/collective trust funds
 -11-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 6Fair Value Measurements (continued)
  Stable Value Fund
 WGL Holdings, Inc. Common Stock Fund
 -12-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 6Fair Value Measurements(continued)
  Stable Value FundBalance as of January 1, 2009
    
    $
    Purchases, sales, issuances and settlements, net
    
    
    Transfer in from Level 2
    
    
    31,615,862Balance as of December 31, 2009
    
    $
    31,615,862Balance as of January 1, 2010
    
    $
    31,615,862Purchases, sales, issuances and settlements, net
    
    
    (2,203,929
    )Total gains
(realized/unrealized)
    
    
    1,515,046Balance as of December 31, 2010
    
    $
    30,926,979
 Fair Value Measurements and Disclosures 
Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)
  Note 7Risks and Uncertainties
  Note 8Related-Party Transactions
  -13-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 NOTES TO FINANCIAL STATEMENTS (continued)
 Note 9 Recent Accounting Pronouncements
 Accounting Standards Adopted in the Current Plan Year
   Reporting Loans to
Participants by Defined Contribution Pension Plans,
 Other Newly Issued Accounting Standards
  -14-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 
 SUPPLEMENTAL SCHEDULE
 Form 5500, Schedule H, Line 4i  Schedule of Assets (Held at End of Year)
As of December 31, 2010
 
 Name of Issuer
    
    Type of Investment
    
    Current ValueAmerican Funds Growth Fund of America
    
    Registered Investment Company
    
    $
    24,070,499CRM Small/Mid Cap Value Institiutional Fund
    
    Registered Investment Company
    
    
    3,248,475MFS International Growth Fund
    
    Registered Investment Company
    
    
    4,065,061PIMCO Total Return Fund
    
    Registered Investment Company
    
    
    7,173,731Templeton Institutional Foreign Equity Fund
    
    Registered Investment Company
    
    
    4,215,609Van Kampen Growth & Income Fund
    
    Registered Investment Company
    
    
    13,903,085Wells Fargo Advantage Discovery Fund
    
    Registered Investment Company
    
    
    5,046,610JPMorgan SmartRetirement Income Fund
    
    Common/Collective Trust
    
    
    919,040JPMorgan SmartRetirement 2010 Fund
    
    Common/Collective Trust
    
    
    1,700,318JPMorgan SmartRetirement 2015 Fund
    
    Common/Collective Trust
    
    
    2,527,479JPMorgan SmartRetirement 2020 Fund
    
    Common/Collective Trust
    
    
    4,352,438JPMorgan SmartRetirement 2025 Fund
    
    Common/Collective Trust
    
    
    3,697,037JPMorgan SmartRetirement 2030 Fund
    
    Common/Collective Trust
    
    
    1,558,368JPMorgan SmartRetirement 2035 Fund
    
    Common/Collective Trust
    
    
    1,040,250JPMorgan SmartRetirement 2040 Fund
    
    Common/Collective Trust
    
    
    491,510JPMorgan SmartRetirement 2045 Fund
    
    Common/Collective Trust
    
    
    196,555JPMorgan SmartRetirement 2050 Fund
    
    Common/Collective Trust
    
    
    440,774a/
    
    SSgA S&P 500 Index Fund
    
    Common/Collective Trust
    
    
    6,094,080a/  b/
    
    Stable Value Fund
    
    Common/Collective Trust
    
    
    30,261,232a/
    
    WGL Holdings, Inc. Common Stock Fund
    
    Common Stock Fund
    
    
    13,360,433Notes
Receivable from Participants
    
    Participant loans with interest
rates ranging from 4.25% to 8.44%
    
    
    2,028,767Total
    
    
    
    $
    130,391,351
 
 a/ 
    
    Denotes Party-in-Interestb/ 
    
    Contract Value -15-




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WASHINGTON GAS LIGHT COMPANY SAVINGS PLAN
 
 SIGNATURES
 The Plan.
 WASHINGTON GAS LIGHT COMPANY
SAVINGS PLANDate:   June 29, 2011
    /s/ Vincent L. Ammann, Jr.Vincent L. Ammann, Jr. (Plan Administrator)Vice President and Chief Financial Officer
Washington Gas Light Company Date: June 29, 2011
    /s/ Luanne GutermuthLuanne Gutermuth (Plan Administrator)Vice President, Human Resources and
Organization Development
Washington Gas Light Company -16-