The Duke Energy Carolinas/Duke Energy Progress merger, approved by North and South Carolina regulators on May 1, may appear to be routine corporate restructuring. In practice, it could shape the future of electricity in the region. The merger raises concerns about market power, consumer price impacts, and regulatory flexibility across diverse territories. At the same time, it offers pathways to cost savings and system efficiencies that are increasingly important in an era of rising demand and capital intensity. Outcomes will depend on whether consolidation erodes accountability and local responsiveness or delivers the scale and coordination needed for more efficient, consumer-centered power systems.
The Case Against: Consolidation and Its Discontents
The most immediate concern is that the merger further entrenches monopoly power. Even before consolidation, North and South Carolina ranked near the bottom nationally in terms of generation competition. Regulated utilities justify geographic monopolies based on high infrastructure costs and the need for coordinated planning. But separate subsidiaries—with distinct rate cases and planning processes—can introduce some differentiation that better reflects local needs.
Combining the utilities removes even that limited fragmentation. A single, larger service territory reduces opportunities to benchmark performance or tailor regulatory approaches to local conditions. What works in fast-growing urban corridors may not suit rural areas with different load profiles and power needs.
There is also a risk of policy homogenization. Separate utilities can pursue different pilot programs, rate designs, or clean energy strategies aligned with local priorities. A unified entity may default to standardization—especially if regulators prioritize administrative simplicity—potentially dampening innovation and limiting tailored solutions.
Consumer advocates may also see diminished leverage. Oversight depends on the ability of commissions and intervenors to scrutinize utility-specific filings. A consolidated entity could make these processes more complex and opaque, reinforcing utilities’ informational advantages.
More broadly, the merger extends a vertically integrated monopoly model at a time when other regions are experimenting with competition, distributed energy resources, and customer choice. Further consolidation may make future reforms more difficult despite public support for greater competition.
The Case For: Efficiency, Scale, and a Reality Check
These concerns face legitimate counterarguments. Duke Energy Progress and Duke Energy Carolinas are not independent competitors. They share a parent company, operate within the same regional grid, and serve contiguous territories. Maintaining separate legal and regulatory structures imposes real costs without delivering meaningful competition.
Duke argues the current structure duplicates planning, operations, and compliance. Combining the utilities would simplify operations and enable more coordinated system planning. The company estimates $2.3 billion in savings from 2027 to 2040, driven in part by reduced fuel use, lower capital expenditures, and avoided investments.
Some of these gains reflect economies of scale. A larger balancing area can optimize dispatch, reducing reliance on higher-cost resources and limiting external purchases. Integrated planning can also avoid redundant capacity additions while maintaining reliability.
Settlement agreements with regulators and stakeholders aim to lock in some of these benefits, including guaranteed customer savings over a multi-year period. In the best case, the merger becomes not just consolidation but a negotiated restructuring with tangible protections.
More fundamentally, maintaining two separate utilities within the same corporate family may represent the worst of both worlds. Customers do not receive the benefits of true competition but still bear the inefficiencies of duplication and fragmented planning. Consolidation, in this view, aligns formal structure with operational reality.
Questions of Governance, Not Just Structure
Ultimately, the significance of the merger hinges less on consolidation itself than on how the combined entity is governed.
Each rate case and regulatory decision will carry greater weight. If regulators treat the merged utility as a platform for standardization, the risks of reduced responsiveness and innovation are real. If instead they use the merger to strengthen performance-based regulation, expand stakeholder engagement, and require differentiated approaches within the unified territory, those risks can be mitigated.
The Carolinas are entering a period of rapid change in the power sector, driven by load growth, clean energy transitions, and rising infrastructure needs. Whether this merger proves beneficial or problematic will depend on whether scale is used to entrench the status quo or enable a more efficient, flexible system.
Jackson Ewing is Director of Energy and Climate Policy at the Nicholas Institute for Energy, Environment & Sustainability at Duke University.
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