Duke Proposes Data Center Tariff
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The Topic

Duke Energy has proposed a large-load tariff in North Carolina that would require data centers and other major customers to pay minimum bills for at least a decade, while forecasting 8 gigawatts of large-customer demand in the Carolinas by 2035. The proposal is intended to reduce the risk that households bear the cost of new generation and grid investment if projected data center loads do not materialize, but advocates want longer contracts, higher payment requirements, lower eligibility thresholds, and a clean-energy procurement option. Other utilities are turning to grid-connected, behind-the-meter, and reused EV batteries to manage peak demand, improve resilience, and address reliability constraints.
First Article: 05/22/26
Latest Article: 07/23/26
Summary
- Duke’s North Carolina proposal would replace confidential large-customer agreements with a standardized tariff and minimum bills lasting at least 10 years.
- Duke raised its 2035 large-customer demand forecast for the Carolinas to 8 gigawatts and linked the outlook to plans for 9.7 gigawatts of new gas generation.
- Consumer and clean-energy advocates want higher minimum payments, 20-year commitments, a lower customer-size threshold, and a separate data center rate class.
- The North Carolina filing does not include a clean transition tariff for customers seeking incremental 24/7 carbon-free energy.
- Utilities and cooperatives are expanding batteries for peak reduction, congestion relief, outage resilience, and demand response as large loads increase.
- Reused EV batteries are being considered for stationary data center storage, although the material presents this as an emerging application rather than an established deployment pattern.
History
The story is now framed more specifically around customer protections and cleaner procurement options, while confirming Duke’s higher load forecast and gas buildout rationale. It also broadens the storage discussion from batteries in general to specific reuse and deployment pathways.
The story has shifted from Duke’s broad data-center load buildup to a concrete North Carolina regulatory proposal that would standardize how large customers pay and help justify new gas capacity. It also now includes an active policy debate over consumer protections and clean-energy access, alongside broader storage and battery responses elsewhere.
