Duke customers in Durham and Raleigh would gain some protection if a large data center cancels its plans or leaves early under a proposed electricity agreement filed October 6. But the deal leaves major decisions about who pays for shared power infrastructure to later proceedings. It does not establish a dollar saving for local households.
Qualifying large customers would have to advance money for their own facilities, provide collateral for network upgrades, pay minimum demand charges and accept early-exit obligations. Duke said October 7 that the settlement awaited North Carolina Utilities Commission approval. We could not independently check the Commission docket on October 8.
The agreement covers both Duke Energy Carolinas, which serves Durham, and Duke Energy Progress, which serves Raleigh. Its proposed terms target qualifying new or additional large loads. They would not automatically cover every existing data center or every proposed Triangle project. Eligibility depends on demand, contract timing and specified exceptions.
What a data center would have to put at risk
The proposal tackles a practical problem: Duke could build equipment for a customer whose promised electricity demand never arrives, or disappears before the equipment is paid for. The proposed tariff puts several obligations on that customer:
- Pay for dedicated facilities. The customer would advance the estimated cost of facilities built for its service and cover any difference when actual costs are known. Refunds of unspent money depend on the contract and whether service has begun. Dedicated-facility terms
- Provide security for shared upgrades. A letter of credit would cover the estimated network-upgrade cost, adjusted to actual cost. Duke could draw on it for remaining book value if the customer terminated early. This is collateral against departure; it does not settle the ultimate division of shared-grid costs. Network-upgrade terms
- Pay a minimum demand charge. Billing demand would be at least 75% of contracted demand. That floor applies to demand charges, which are tied to capacity, rather than 75% of the entire electricity bill. Billing terms
- Accept an exit bill. Early departure would trigger notice requirements and calculated damages. Those calculations include minimum-demand and facility charges during notice, remaining facility charges and part of the remaining minimum-demand obligation. Payments actually made during notice would count toward the obligation. Termination terms
These requirements give Duke ways to recover specified costs when a customer leaves. They also have limits: network collateral would decline over time after the customer reaches the specified demand level, and the tariff allows certain contract reductions and waiver requests. The full terms matter more than a headline penalty figure.
The settlement also addresses reliability while new demand comes online. Customers would generally accept specified power-interruption options during their ramp-up period and another year, or a Commission-approved alternative, with exceptions available. That is a proposed operating obligation, with no demonstrated reliability result yet. Reliability provisions
The bigger cost decisions come later
Who should pay for a transmission upgrade that serves a large customer and other users? The settlement leaves that allocation question open. Duke would have 12 months after approval to submit a report on methods for assigning transmission costs directly to large customers, following stakeholder discussions. The Commission would then decide the approach. Any approved method would apply to service agreements signed after that method’s approval. Transmission allocation provisions
Power-generation costs are another unfinished piece. Duke would provide an analysis of the cost of serving large-load customers and generation-cost allocation in its next base rate case. Parties could still argue for different allocations. Until those decisions and customer-specific costs are available, the agreement cannot establish what a Durham or Raleigh household would save. Future cost analysis
Consumer protection is contested
The Public Staff, an independent agency representing utility customers, signed the agreement. It is separate from the Commission that decides whether to approve it. Its support gives the proposal a consumer representative’s backing, alongside Duke’s own claims of protection. Public Staff signature
The Southern Environmental Law Center argues that the upfront payments and exit protections are too lenient. Its criticism identifies a disputed risk, not an established household bill increase. For Triangle customers, the decisive evidence will be the Commission’s terms and its later allocation of shared infrastructure costs. The proposed safeguards alone cannot answer how much of that infrastructure other customers will ultimately fund.