The Duke Energy Carolinas rate increase 2027 is two months from its requested start date and still waiting on a decision. Under the settlement filed on July 17, retail rates would rise by an average of 4.3% in the first year and 3.1% in the second, according to the fact sheet Duke Energy furnished to the SEC. That comes to $496 million over two years, about half of the $1,002 million the company asked for in November 2025. When WRAL reported on the case on October 22, the North Carolina Utilities Commission had not approved it, and the Commission can still change the terms.
For a plant, warehouse or dealership in central or western North Carolina, the sums matter less than the calendar. There are two dates to plan around, and only one of them can still be reached.
What does the settlement change?
The case is docket E-7 Sub 1329. Duke Energy Carolinas opened it asking for about 15.0% over two years, cut that to about $622 million in its June 19 rebuttal testimony, and reached the current figure with the Public Staff and other parties in what the filing calls a Comprehensive Revenue Requirement Settlement. The return on equity lands at 9.8%, against the 10.95% first requested and the 10.1% approved in the last case.
Year one carries the larger share, $286 million of the $496 million. Duke has asked for those rates to be in effect no later than January 1, 2027. The company also says it will evaluate delaying its next base rate case until no earlier than November 1, 2028, provided it can defer the cost of certain new generating plants. For anyone budgeting, that is a planning signal and not a commitment.
The agreement is not unanimous. Attorney General Jeff Jackson declined to sign it, citing the residential increase of about 9.5% over two years. A parallel case for eastern North Carolina is covered in our piece on the Duke Energy Progress rate increase.
What will a commercial customer pay?
The published 4.3% and 3.1% are averages across retail customers, and the fact sheet gives no percentage for commercial rate schedules. We will not guess at one. WUNC reports residential increases of 5.9% in 2027 and 3.6% in 2028, which sit above the average, so the other classes taken together sit below it.
Your own number will depend on your schedule, and it will be known once the Commission rules and the tariffs are filed. A commercial bill is built on the energy charge and on the demand charge set by the highest measured interval of the month, and how a rate increase falls across those two lines decides what it does to a given facility.
Large users have a further item to watch. The parties agreed to support a separate proceeding on a large load tariff, with the intention of finishing it before the new rates start. That sits alongside the Attorney General's request for a data center rate class in North Carolina.
Which date can a facility still reach?
A commercial system started today will not be running on January 1, 2027. Design, permitting and the utility's interconnection review take longer than two months.
The date worth building toward is the second one. Reporting on the settlement puts the second step on January 1, 2028. One day earlier, on December 31, 2027, is the placed-in-service deadline for a solar project that starts construction now and wants the 30% federal solar tax credit. A project begun this winter has a real schedule for both, as long as the interconnection application goes in early. The credit is claimed on your own return and depends on your tax position, so your accountant has the final word.
Storage runs on a longer clock. The credit for battery systems is not subject to that 2027 deadline, so a battery can be decided on its own numbers.
How we read a Duke Energy Carolinas bill
We have been building commercial solar across the Southeast since 2001, and our page on commercial solar installation in North Carolina covers how projects work in the state. We start with twelve months of bills and split them into three lines: the energy charge, the demand charge, and any power factor correction penalty, which is often the cheapest of the three to remove.
Each line has its own remedy. An array replaces daytime kilowatt-hours at a cost that is fixed on the day the system is commissioned. The demand charge is the job of commercial battery storage sized from interval data, because a cloudy afternoon can set your billed peak on its own. The 1.267 MW rooftop and battery system we built for Samsonite and TUMI in Vidalia, Georgia, pairs the two at industrial scale. Our article on commercial battery storage payback explains how we decide whether a battery pays on a given rate.
Pull your last twelve Duke Energy Carolinas bills and send them to us. We will tell you what each line costs you today, what a system would take off it, and whether a project can realistically be in service before the end of 2027. If the numbers do not work on your schedule, we will say so.