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          <USAddress>
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            <CityNm>Stanley</CityNm>
            <StateAbbreviationCd>ND</StateAbbreviationCd>
            <ZIPCd>58784</ZIPCd>
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        <ServicesDesc>Powerline Construction</ServicesDesc>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>221000</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>211502946</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Capital Credits</Desc>
        <BusinessCd>221000</BusinessCd>
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        <ExclusionAmt>290389</ExclusionAmt>
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      <NetGainOrLossInvestmentsGrp>
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        <ExclusionAmt>-17958</ExclusionAmt>
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        <RelatedOrExemptFuncIncomeAmt>274952</RelatedOrExemptFuncIncomeAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>272431</ExclusionAmt>
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      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <BenefitsToMembersGrp>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>708717</TotalAmt>
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      <OtherSalariesAndWagesGrp>
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      <PensionPlanContributionsGrp>
        <TotalAmt>1401015</TotalAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>742031</TotalAmt>
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      <InterestGrp>
        <TotalAmt>14565741</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Cost of Power</Desc>
        <TotalAmt>133476178</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Distribution &amp; Transmis</Desc>
        <TotalAmt>13854606</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Admin &amp; General &amp; Other</Desc>
        <TotalAmt>4888671</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Customer, Sales &amp; Servi</Desc>
        <TotalAmt>2384935</TotalAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>-12379254</TotalAmt>
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      <TotalFunctionalExpensesGrp>
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      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>5785563</EOYAmt>
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        <EOYAmt>13384366</EOYAmt>
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      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>8603965</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>30055935</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>503663369</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>72657223</LandBldgEquipAccumDeprecAmt>
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        <EOYAmt>431006146</EOYAmt>
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        <EOYAmt>193076</EOYAmt>
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        <EOYAmt>5500</EOYAmt>
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      <InvestmentsProgramRelatedGrp>
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        <EOYAmt>32930369</EOYAmt>
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        <EOYAmt>8621</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>521973541</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>17438587</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>344286291</EOYAmt>
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      <OtherLiabilitiesGrp>
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        <EOYAmt>10379992</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>389879853</EOYAmt>
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      <OrgDoesNotFollowSFAS117Ind>X</OrgDoesNotFollowSFAS117Ind>
      <CapStkTrPrinCurrentFundsGrp>
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        <EOYAmt>8795518</EOYAmt>
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      <PdInCapSrplsLandBldgEqpFundGrp>
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        <EOYAmt>0</EOYAmt>
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      <RtnEarnEndowmentIncmOthFndsGrp>
        <BOYAmt>89797958</BOYAmt>
        <EOYAmt>123298170</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
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        <EOYAmt>132093688</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>521973541</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>373981</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>33658412</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleD documentId="RetDoc1040000001">
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      <InclEscrowCustodialAcctLiabInd>1</InclEscrowCustodialAcctLiabInd>
      <ExplanationProvidedInd>X</ExplanationProvidedInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>5395865</OtherCostOrOtherBasisAmt>
        <BookValueAmt>5395865</BookValueAmt>
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      <BuildingsGrp>
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        <DepreciationAmt>13098389</DepreciationAmt>
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      <OtherLandBuildingsGrp>
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        <BookValueAmt>95520469</BookValueAmt>
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      <InvstProgramRelatedOrgGrp>
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        <MethodValuationCd>C</MethodValuationCd>
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      <InvstProgramRelatedOrgGrp>
        <Desc>RESC Stock</Desc>
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        <MethodValuationCd>C</MethodValuationCd>
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      <InvstProgramRelatedOrgGrp>
        <Desc>NRUFC Certificates</Desc>
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        <MethodValuationCd>C</MethodValuationCd>
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        <Desc>Memberships</Desc>
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        <MethodValuationCd>C</MethodValuationCd>
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      <InvstProgramRelatedOrgGrp>
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        <MethodValuationCd>C</MethodValuationCd>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV, Line 2b:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cooperative collects funds for the Operation Round Up program for the Mountrail Cooperative Trust and the Williams Cooperative Trust from the members. These funds are recorded as a liability on the Cooperative financials until they are released to the Trust on a quarterly basis. Mountrail Cooperative Trust receives 45% of the funds, while Williams Cooperative Trust receives 55% of the funds. The amount recorded in the financial statements at December 31, 2015 was $1,634.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cooperative is exempt from income taxes under Section 501(c)(12). The Cooperative files Federal Form 990T for its Unrelated Business Taxable Income (UBTI). The Cooperative follows the provisions of Accounting and Standards Codification (ASC) 740-10 Accounting for Uncertainty in Income Taxes. As of December 31, 2015 and 2014, the unrecognized tax benefit accrual was zero. The Cooperative will recognize future accrued interest and penalties related to unrecognized tax benefits in income tax expense if such penalties and interest are incurred. Under normal circumstances, the Cooperative and Subsidiary are no longer subject to Federal tax examinations by tax authorities for years before 2012 and state examinations for years before 2012. The Cooperative has undergone an annual analysis of various tax positions, assessing the likelihood of those positions being upheld upon examination with relevant tax authorities, as defined by ASC 740-10.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage Capital Credits Allocated For Current Year 33,966,246.</ExplanationTxt>
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        <DeferredCompensationFlngOrgAmt>102774</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>Jay Lux</PersonNm>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Housing prices in MWEC's service area were greatly inflated due to an oil boom. A housing allowance of $750/month was given to all union and some non-union employees as part of their compensation package. This will be reviewed when the union contract runs out in 2018.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part II Column C</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation of Officers, Directors, Key Employees, Highest Compensated Employees And Independent Contractors: included in other compensation is teh estimated current year increase in the actuarial value of the defined benefit plan. These amounts do not represent any current year contributions to the plan. They are estimates of the increase in the actuarial value of the plans received from the NRECA. The current year expense and the increase in actuarial value for each employee are reflected in the Schedule O statement for Form 990, Part VII, Column F.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cooperative has one class of members. Each member has one vote. A household is considered to be one member.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The members of the Cooperative elect the Board of Directors. Each member has one vote.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>Changes in the Cooperative's Bylaws and the sale of a high percentage of the Cooperative's assets must be approved by the members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>There are no committees with the authority to act on behalf of the full Board of Directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>The Business Manager and General Manager will review a draft. The approved Form 990 will be presented at the July 2016 board meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Directors of Mountrail-Williams Electric Cooperative are expected to disclose a situation which, in their opinion, is or could appear to be a conflict of interest. After such a disclosure, the Director must leave the Board meeting when issues involving the conflict of interest are discussed. The Director is not allowed to vote on issues regarding the conflict of interest.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board performed an evaluation of the General Manager. They compared his compensation with the state wide salary survey as a guide to the compensation amount. The Board votes on the compensation. For the General Manager this is an annual occurrence. The Board voted in 2015 on his 2016 compensation. This process last took place in October of 2015. The Board negotiates with the union in regards to staff increases. The Business Manager's salary is determined by the General Manager.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents, conflict of interest policy and financial statements available upon request. All new members receive a copy of the bylaws upon becoming a member. A financial report is distributed at the members' annual meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Compensation: Included in column "F", Estimated Amount of Other Compensation, is the estimated annual increase in the actuarial value of the defined benefit plan. The estimated increase for Dale Haugen is $93,699, $40,036 for Bruce Balerud, $106,469 for Jay Lux, $6,968 for Josh Heredia, $20,356 for Jeremy Folven, $65,628 for Mark Telehey, and $42,929 for Jerry Rehak. These amounts are estimates in the increase of the value of the plan and are not current year expenses of the Cooperative. The current year expense for this defined benefit plan was $65,317 for Dale Haugen, $34,566 for Bruce Balerud, $45,123 for Jay Lux, $14,871 for Josh Heredia, $25,306 for Jeremy Folven, $25,306 for Mark Telehey, and $37,948 for Jerry Rehak.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Allocated Costs: The labor, pension and payroll taxes reported on lines 5-10 are already included in distribution expense, administrative &amp; general expense and customer expense. Therefore, these amounts are being subtracted out as an other deduction on line 24e in the amount of $(12,379,254).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Functional Expense, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>Benefits Paid to Members: The Cooperative has interpreted the instructions to Part IX, Line 4, to mean patronage capital allocated for the year, rather than patronage capital retired. This is consistent with the Bylaws of the Cooperative.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Retirement of Capital Credits -387,797. Discounted Estate Requirements 12,302. Unclaimed Capital Credits 67,661. Patronage Capital Credits Allocated For Current Year 33,966,246.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <CityNm>Williston</CityNm>
          <StateAbbreviationCd>ND</StateAbbreviationCd>
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