2109100 - Disclosure - Asset Retirement Obligations: link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Asset Retirement Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Asset Retirement Obligations (Tables) link:presentationLink link:calculationLink link:definitionLink 2101100 - Disclosure - Business Description And Significant Accounting Policies: link:presentationLink link:calculationLink link:definitionLink 2401403 - Disclosure - Business Description And Significant Accounting Policies: Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 2401409 - Disclosure - Business Description And Significant Accounting Policies: Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2401404 - Disclosure - Business Description And Significant Accounting Policies: Allowance for Doubtful Accounts (Details) link:presentationLink link:calculationLink link:definitionLink 2401412 - Disclosure - Business Description And Significant Accounting Policies: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 2401411 - Disclosure - Business Description And Significant Accounting Policies: Earnings per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2401407 - Disclosure - Business Description And Significant Accounting Policies: Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 2401406 - Disclosure - Business Description And Significant Accounting Policies: Investments (Details) link:presentationLink link:calculationLink link:definitionLink 2401405 - Disclosure - Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) link:presentationLink link:calculationLink link:definitionLink 2401413 - Disclosure - Business Description And Significant Accounting Policies: Recently Adopted Accounting Standards (Details) link:presentationLink link:calculationLink link:definitionLink 2401410 - Disclosure - Business Description And Significant Accounting Policies: Regulatory Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2401408 - Disclosure - Business Description And Significant Accounting Policies: Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2201201 - Disclosure - Business Description (Policies) link:presentationLink link:calculationLink link:definitionLink 2301302 - Disclosure - Business Description (Tables) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 2406404 - Disclosure - Business Segment Information: Capital Expenditures and Asset Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 2406406 - Disclosure - Business Segment Information: Information Relating to Segments Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2406406 - Disclosure - Business Segment Information: Information Relating to Segments Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Business Segment Information: Intercompany Power Purchase Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 2406405 - Disclosure - Business Segment Information: Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Business Segment Information: Segment Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Business Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2134100 - Disclosure - Commitments And Contingencies: link:presentationLink link:calculationLink link:definitionLink 2434406 - Disclosure - Commitments And Contingencies: Future Purchase Agreement - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 2434410 - Disclosure - Commitments And Contingencies: Manufactured Gas Processing (Details) link:presentationLink link:calculationLink link:definitionLink 2434403 - Disclosure - Commitments And Contingencies: Power Purchase Agreement - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 2434402 - Disclosure - Commitments And Contingencies: Power Purchase and Transmission Services Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2434407 - Disclosure - Commitments And Contingencies: Power Sales Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2434404 - Disclosure - Commitments And Contingencies: Purchase Commitment (Details) link:presentationLink link:calculationLink link:definitionLink 2434409 - Disclosure - Commitments And Contingencies: Reclamation Liability (Details) link:presentationLink link:calculationLink link:definitionLink 2434408 - Disclosure - Commitments And Contingencies: Reimbursement Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 2334301 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 2434405 - Disclosure - Commitments And Contingencies: Unconditional Purchase Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1003501 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1002501 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1005000 - Statement - Consolidated Statements Of Equity link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Consolidated Statements of Income link:presentationLink link:calculationLink link:definitionLink 2138100 - Disclosure - Discontinued Operations: link:presentationLink link:calculationLink link:definitionLink 2438402 - Disclosure - Discontinued Operations (Details) link:presentationLink link:calculationLink link:definitionLink 2338301 - Disclosure - Discontinued Operations (Tables) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2122100 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 2422409 - Disclosure - Employee Benefit Plans: Accumulated Benefit Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 2422411 - Disclosure - Employee Benefit Plans: Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2422408 - Disclosure - Employee Benefit Plans: Amounts Recognized in the Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 2422406 - Disclosure - Employee Benefit Plans: Changes in Benefit Obligation (Details) link:presentationLink link:calculationLink link:definitionLink 2422407 - Disclosure - Employee Benefit Plans: Changes in Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2422410 - Disclosure - Employee Benefit Plans: Components of Net Periodic Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2422412 - Disclosure - Employee Benefit Plans: Defined Benefit Plans Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 2422405 - Disclosure - Employee Benefit Plans: Employee Benefit Plans Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 2422402 - Disclosure - Employee Benefit Plans: Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2422403 - Disclosure - Employee Benefit Plans: Plan Assets Allocation (Details) link:presentationLink link:calculationLink link:definitionLink 2422404 - Disclosure - Employee Benefit Plans: Plan Contributions (Details) link:presentationLink link:calculationLink link:definitionLink 2422413 - Disclosure - Employee Benefit Plans: Projected Benefit Plan Payments (Details) link:presentationLink link:calculationLink link:definitionLink 2322301 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Equity: link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Equity: At-the-Market Equity Offering Program (Details) link:presentationLink link:calculationLink link:definitionLink 2414408 - Disclosure - Equity: Dividend Reinvestment and Stock Purchase Plan (Details) link:presentationLink link:calculationLink link:definitionLink 2414404 - Disclosure - Equity: Equity Compensation Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2414410 - Disclosure - Equity: Noncontrolling Interest in Subsidiary (Details) link:presentationLink link:calculationLink link:definitionLink 2414407 - Disclosure - Equity: Performance Share Plan (Details) link:presentationLink link:calculationLink link:definitionLink 2414409 - Disclosure - Equity: Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 2414406 - Disclosure - Equity: Restricted Stock (Details) link:presentationLink link:calculationLink link:definitionLink 2414405 - Disclosure - Equity: Stock Options (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 2414403 - Disclosure - Equity Units (Details) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 2411403 - Disclosure - Fair Value Measurements: Balance Sheet Location (Details) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Fair Value Measurements: Balance Sheet Offsetting (Details) link:presentationLink link:calculationLink link:definitionLink 2311301 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Fair Value Of Financial Instruments: link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Fair Value of Financial Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2136100 - Disclosure - Guarantees: link:presentationLink link:calculationLink link:definitionLink 2436402 - Disclosure - Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 2336301 - Disclosure - Guarantees (Tables) link:presentationLink link:calculationLink link:definitionLink 2118100 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2418410 - Disclosure - Income Taxes: Carryforwards, State and Foreign Tax Credits (Details) link:presentationLink link:calculationLink link:definitionLink 2418404 - Disclosure - Income Taxes: Current and Deferred Income Tax Expense (Benefit) (Details) link:presentationLink link:calculationLink link:definitionLink 2418405 - Disclosure - Income Taxes: Deferred Income Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2418406 - Disclosure - Income Taxes: Effective Tax Rate Differences From Statutory Tax Rates (Details) link:presentationLink link:calculationLink link:definitionLink 2418409 - Disclosure - Income Taxes: Interest, Penalties and Audits (Details) link:presentationLink link:calculationLink link:definitionLink 2418407 - Disclosure - Income Taxes: Net Operating Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 2418408 - Disclosure - Income Taxes: Reconciliation of unrecognized tax benefits (Details) link:presentationLink link:calculationLink link:definitionLink 2318301 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2418403 - Disclosure - Income Taxes: Tax Benefit Related to Legal Restructuring (Details) link:presentationLink link:calculationLink link:definitionLink 2418402 - Disclosure - Income Taxes: Tax Cut and Jobs Act (Details) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Jointly Owned Facilities: link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Jointly Owned Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 2405403 - Disclosure - Jointly Owned Facilities - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Jointly Owned Facilities (Tables) link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Leases: link:presentationLink link:calculationLink link:definitionLink 2416407 - Disclosure - Lessee - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 2416407 - Disclosure - Lessee - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 2416403 - Disclosure - Lessee - Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 2416404 - Disclosure - Lessee - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 2416405 - Disclosure - Lessee - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 2416406 - Disclosure - Lessee - Weighted Average Information (Details) link:presentationLink link:calculationLink link:definitionLink 2416408 - Disclosure - Lessor (Details) link:presentationLink link:calculationLink link:definitionLink 2416409 - Disclosure - Lessor - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 2107100 - Disclosure - Long-Term Debt: link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Long-Term Debt: Aggregate Maturities of Long Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2407405 - Disclosure - Long-Term Debt: Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2407404 - Disclosure - Long-Term Debt: Debt Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2407406 - Disclosure - Long-Term Debt: Dividend Restrictions (Details) link:presentationLink link:calculationLink link:definitionLink 2307301 - Disclosure - Long-Term Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2108100 - Disclosure - Notes Payable: link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Notes Payable (Details) link:presentationLink link:calculationLink link:definitionLink 2308301 - Disclosure - Notes Payable (Tables) link:presentationLink link:calculationLink link:definitionLink 2416402 - Disclosure - Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 2316301 - Disclosure - Operating Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 2120100 - Disclosure - Other Comprehensive Income: link:presentationLink link:calculationLink link:definitionLink 2420403 - Disclosure - Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:calculationLink link:definitionLink 2104100 - Disclosure - Property, Plant And Equipment: link:presentationLink link:calculationLink link:definitionLink 2404402 - Disclosure - Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Property, Plant and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 2140100 - Disclosure - Quarterly Historical Data (Unaudited): link:presentationLink link:calculationLink link:definitionLink 2440402 - Disclosure - Quarterly Historical Data (Unaudited) (Details) link:presentationLink link:calculationLink link:definitionLink 2340301 - Disclosure - Quarterly Historical Data (Unaudited) (Tables) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Regulatory Matters: link:presentationLink link:calculationLink link:definitionLink 2415405 - Disclosure - Regulatory Matters: Electric Utilities Regulatory Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2415403 - Disclosure - Regulatory Matters: Gas Price Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 2415404 - Disclosure - Regulatory Matters: Gas Supply Contract Termination (Details) link:presentationLink link:calculationLink link:definitionLink 2415406 - Disclosure - Regulatory Matters: Gas Utilities Regulatory Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2415402 - Disclosure - Regulatory Matters: Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 2315301 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 2402402 - Disclosure - Revenue: Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2302301 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Risk Management Activities: link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Risk Management Activities: Cash Flow Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Risk Management Activities: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Risk Management Activities (Tables) link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Risk Management Activities: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 2411402 - Disclosure - Schedule of Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2421402 - Disclosure - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 2321301 - Disclosure - Supplemental Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2121100 - Disclosure - Supplemental Disclosure of Cash flow Information: link:presentationLink link:calculationLink link:definitionLink