Duke Energy operates in the U.S. primarily through its direct and indirect subsidiaries. The remainder of Duke Energy's operations is presented as Other. Coal purchased for Indiana is primarily produced in Indiana and Illinois. Therefore, the license no longer authorizes operation of the reactor. Margin decoupling provides a set revenue per customer independent of actual usage. A significant competitive factor is price. Natural gas costs are eligible for recovery by Gas Utilities and Infrastructure. Our ERGs are open to all employees. Executive officers serve until their successors are duly elected or appointed. Mr. Savoy assumed his current position in October 2019. Piedmont operates one reportable business segment, Gas Utilities and Infrastructure. In other areas, demand for power peaks during the winter. Duke Energy Indiana\'s ownership is 62.5% of the facility. The MW displayed in the table below are based on nameplate capacity. The case was removed from Baltimore City Circuit Court to federal District Court. As we look beyond 2030, we will need additional tools to continue our progress. The majority of spend is expected to occur over the next 15-20 years. A continued decline in energy market pricing would likely result in a future impairment. The following is a detailed discussion of the variance drivers by line item. Other Income and Expenses, net. The below percentages for retail customer classes represent billed sales only. Amounts are not weather-normalized. The variance was driven primarily by lower interest rates on outstanding debt. The WACC takes into account both the after-tax cost of debt and cost of equity. These estimates are subject to change. See Note 9 to the Consolidated Financial Statements, "Asset Retirement Obligations. The Duke Energy Registrants cannot predict the outcome of this matter. We believe that our audits provide a reasonable basis for our opinion. Accordingly, we express no such opinion. These legal obligations are the result of Indiana state and federal regulations. See Note 3 for further information. See Note 17 for additional information. Amortization is recorded using the units-of-production method. Receivables for reinsurance coverage are recognized when realization is deemed probable. See Notes 3 and 4 for further information. Duke Energy also offers special termination benefits under voluntary severance programs. In March 2020, the FASB issued new accounting guidance for reference rate reform. In addition, direct interest expense and income taxes are included in segment income. 140FINANCIAL STATEMENTSREGULATORY MATTERSAROs – coal ash. The AROs relate primarily to decommissioning nuclear power facilities. The regulatory asset balance is net of the AFUDC equity portion. Amount is amortized over the life of the related debt. Deferred asset – Lee and Harris COLA. Net regulatory liability related to income taxes. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. The deferral request did not include lost revenues. As a result of the order, revised customer rates were effective June 1, 2019. Oral arguments have not yet been scheduled by the Supreme Court of South Carolina. On February 23, 2018, the NCUC issued an order approving the stipulation. The ORS filed a Notice of Cross Appeal on November 20, 2019. The parties are currently in FERC settlement procedures. The parties have filed additional pleadings. This adjustment reduced the estimated cost of
