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Duke Energy is seeking regulatory approval to recover nearly $800 million in fuel and purchased power costs after extreme winter weather drove record electricity demand and forced the utility to buy expensive power from neighboring grids.
The utility disclosed that prolonged subfreezing temperatures across the Carolinas in late January and early February pushed electricity demand beyond available in-system generation capacity, culminating in a record winter peak load of 37,308 MWh on January 27.
To maintain uninterrupted service, Duke Energy turned to external suppliers, purchasing electricity at elevated market prices—costs it now plans to pass through to customers pending approval from the North Carolina Utilities Commission.
The company’s filings cover approximately $500 million in costs for Duke Energy Carolinas and $309 million for Duke Energy Progress. These expenses, described as pass-through costs without markup, reflect emergency measures taken to ensure grid reliability during one of the most severe winter periods in a decade.
If approved, residential customers could see monthly bill increases of roughly $6.90 to $7.88 starting June 1, with Duke proposing to spread the recovery over 19 months to soften the immediate impact.
The episode highlights a growing structural challenge for U.S. utilities: balancing reliability against increasingly volatile demand driven by extreme weather and rapid population growth. Duke Energy noted that North Carolina alone has added around 150,000 customers over the past two years, while industrial expansion tied to energy-intensive manufacturing continues to accelerate.
In response, the company is advancing a major capacity expansion plan, targeting 19.6 GW of new generation over the next decade alongside grid upgrades and energy storage deployment.
The reliance on external power purchases during peak stress periods underscores a broader trend across U.S. power markets, where reserve margins are tightening amid coal retirements, rising electrification, and intermittent renewable integration. Utilities are increasingly forced into spot markets during demand spikes, exposing both operators and customers to price volatility.
Duke Energy’s latest filing reinforces the argument – frequently made by regulated utilities – that long-term reliability will require sustained investment in dispatchable generation and grid resilience, even as the energy transition accelerates.
By Charles Kennedy for Oilprice.com
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