Duke Energy Carolinas Secures $25.7 Billion Rate Base Settlement With North Carolina Utilities Commission

Comprehensive Settlement Framework Addresses Multiple Revenue Components

Duke Energy Carolinas disclosed that the comprehensive settlement resolves all remaining revenue requirement items in its rate case proceeding before the North Carolina Utilities Commission. The filing indicates that the settlement encompasses critical financial parameters including the company's authorized return on equity, capital structure composition, rate base valuation, and multi-year capital investment framework. The settlement was filed jointly with the Public Staff of the North Carolina Utilities Commission and other intervening parties on July 17, 2026.

The disclosure notes that testimony consistent with the comprehensive settlement would be filed the following week after the July 17 announcement. This structured approach, wherein settlement terms are disclosed before supporting testimony is filed, represents a significant step toward regulatory closure on the rate adjustment proceeding initiated by Duke Energy Carolinas on November 20, 2025. The timing of the settlement announcement suggests that negotiations among all parties reached a mutually acceptable resolution on the key economic and operational terms governing the company's regulated utility operations in North Carolina.

Return on Equity and Capital Structure Parameters Established

The settlement establishes a return on equity of 9.8% based on a capital structure with a 53% equity component, according to the disclosure. These parameters represent the authorized financial returns and leverage ratios that will govern Duke Energy Carolinas' regulated operations during the rate plan period. The equity component percentage determines the proportion of the company's capital structure that must be financed through equity investments, with the remainder financed through debt and other instruments.

The 9.8% return on equity represents the allowed profit margin that the company can earn on its equity investments in regulated utility assets serving North Carolina customers. This rate of return is designed to provide sufficient earnings to support the company's cost of capital, dividend payments, and reinvestment in infrastructure while also balancing the interests of ratepayers. The filing does not provide specific detail regarding how this return compares to the company's previous authorized return or to the return originally sought in the November 2025 application.

Rate Base Valuation and Historic Base Case Parameters

Duke Energy Carolinas disclosed that the settlement establishes a retail rate base of approximately $25.7 billion for the historic base case. The rate base represents the value of the company's capital investments in utility plant, equipment, and infrastructure that serve retail customers in the Carolinas. This figure provides the foundation upon which regulated rates are calculated, as allowed revenue is typically determined by multiplying the rate base by the authorized return on equity and adding authorized operating expenses.

The filing indicates this rate base figure applies specifically to the historic base case component of the settlement, which establishes baseline values from which forward projections and multi-year adjustments would be calculated. The disclosure does not provide information about the rate base value as of prior regulatory periods or the magnitude of change from previously approved levels. The use of a "historic base case" suggests the settlement may include provisions for updating rates over time based on actual capital investments and cost changes during the multi-year rate plan period.

Multi-Year Rate Plan Capital Investment Framework

The settlement incorporates approximately $3.8 billion of capital investment across a multi-year rate plan, with an annual refund mechanism, according to the disclosure. This framework allows Duke Energy Carolinas to plan and execute capital investments in generation, transmission, distribution, and customer service infrastructure across multiple years while maintaining regulatory cost recovery certainty. The multi-year rate plan approach permits the company to undertake long-term infrastructure modernization and reliability projects with predictable regulatory outcomes.

The annual MYRP refund mechanism referenced in the disclosure suggests that actual capital investments and costs will be tracked and reconciled against approved levels, with customer refunds issued if actual costs fall below authorized amounts. This type of mechanism provides cost controls for ratepayers while ensuring the company has adequate financial assurance for capital planning. The disclosure does not specify the duration of the multi-year rate plan period, specific capital investment categories, or the methodology for calculating annual refunds under the mechanism.

Potential Delay of Next Rate Case Filing

The settlement includes agreement to evaluate the potential to delay Duke Energy Carolinas' next base rate case filing until no earlier than November 1, 2028, provided the North Carolina Utilities Commission grants deferral of costs for certain new generating assets. This provision addresses the timing and scope of future regulatory filings by establishing a potential three-year interval between the current settlement and the next base rate case proceeding. The conditional nature of this provision reflects the requirement that the company first secure regulatory approval for cost deferral treatment of specified generating assets.

The deferral of generating asset costs represents an important element of long-term regulatory planning, as it allows the company to recover costs outside the traditional base rate case process while ensuring that necessary infrastructure investments can proceed. The filing does not identify the specific generating assets subject to potential deferral treatment or describe the nature and anticipated cost magnitude of these assets. The eventual deferral mechanism, if approved, would provide an alternative path for cost recovery beyond base rate adjustments.

Duke Energy Progress Rate Case Settlement Discussions

The filing discloses that intervening parties to the Duke Energy Carolinas settlement have agreed to pursue good faith settlement discussions in the ongoing Duke Energy Progress rate case proceeding, identified as Docket No. E-2, Sub 1380. The intervening parties have committed to seek a substantially similar settlement framework for the DEP proceeding, suggesting that the comprehensive terms achieved in the Duke Energy Carolinas settlement may serve as a template for resolving the separate DEP rate adjustment case. Duke Energy Progress is Duke Energy's other regulated utility subsidiary serving portions of North Carolina.

The coordination between the two rate cases reflects common ownership and operational integration between Duke Energy Carolinas and Duke Energy Progress, both subsidiaries of Duke Energy Corporation. By establishing settlement principles applicable across both utility jurisdictions, the agreement may expedite resolution of the DEP rate case while ensuring consistent regulatory treatment and cost recovery principles. The disclosure indicates that settlement discussions in the DEP case would be conducted on a good faith basis, but does not guarantee that an agreement will be reached or specify a timeline for completion of those discussions.

Accounting Treatment and Non-Recurring Charges

The settlement is expected to result in one-time pre-tax accounting charges of approximately $40 million, which Duke Energy Carolinas will recognize in 2026, according to the disclosure. These charges will be treated as special items and excluded from adjusted earnings calculations used in company guidance and investor communications. The nature of these one-time charges is not specified in the filing, but such charges typically arise from costs associated with settling regulatory disputes, implementing agreed-upon rate structures, or reflecting prior period adjustments related to the rate case process.

The treatment of the charges as special items and their exclusion from adjusted earnings reflects accounting practices that distinguish between recurring operational results and non-recurring settlement-related costs. This accounting treatment allows investors to evaluate the company's underlying operational performance separate from the impact of the rate settlement. The filing does not provide detail regarding the specific components of the $40 million charge or the timing of recognition across quarters in 2026.

Performance Based Regulation Framework and Future Operations

The settlement addresses Duke Energy Carolinas' application for adjustment of rates and charges and for Performance Based Regulation, originally filed on November 20, 2025. Performance-based regulation represents a regulatory mechanism that ties utility earnings to achievement of specified operational and service quality metrics beyond traditional cost-of-service ratemaking. The disclosure indicates that the comprehensive settlement resolves remaining revenue requirement items, suggesting that PBR metrics and incentive mechanisms may have been negotiated as part of the overall settlement package.

Performance-based regulation frameworks have become increasingly common in state utility regulation, as they allow utilities to earn returns through efficiency improvements and service quality enhancements while providing customers with benefits through improved reliability and customer service. The filing does not specify which performance metrics are included in the PBR framework or how earnings adjustments would be calculated based on achievement of those metrics. Implementation of PBR principles may influence Duke Energy Carolinas' operational priorities and capital allocation decisions during the rate plan period.

Regulatory and Legal Process Timeline

Duke Energy Carolinas disclosed that testimony consistent with the comprehensive settlement would be filed in the week following the July 17 announcement. This structured timeline reflects standard regulatory practice wherein settlement terms are disclosed first, followed by supporting testimony from company witnesses and other parties that explain the basis for the settlement and its rationale. The filing of testimony represents a procedural step that typically precedes formal regulatory commission approval of the settlement agreement.

The disclosure notes that the settlement was filed with the Public Staff of the North Carolina Utilities Commission and other intervening parties on July 17, 2026. Intervening parties, which may include consumer advocacy groups, industrial customers, and other stakeholders, participated in negotiation of the settlement terms. The joint filing with all parties suggests that consensus was achieved on settlement terms, though the ultimate approval authority remains the North Carolina Utilities Commission, which must formally approve the settlement before it becomes effective. The disclosure does not specify when formal commission approval is anticipated or whether any conditions precedent must be satisfied.