Duke Energy's data-center tariff makes Amazon and Microsoft pay for wires, not the power plants
North Carolina's first large-load tariff, now before state regulators, drops the clean-energy mechanism Duke Energy promised the same customers in 2024. The five-member Utilities Commission rules by mid-November, ten days after Duke's earnings, on whether data centers pay for the plants their demand forces.
Vincent Jiang · 3 min read
Duke Energy−0.47% — Duke Energy, down 0.47 percent today, the Charlotte utility, filed the final version of North Carolina's first large-load tariff this week 1. The clean transition tariff it promised Amazon+0.37% — Amazon, up 0.37 percent today, Google, Microsoft+1.26% — Microsoft, up 1.26 percent today and Nucor−0.96% — Nucor, down 0.96 percent today, a steelmaker, in a 2024 memorandum of understanding is not in it: Duke told state regulators that no party has presented enough detail to design one 1. Nick Jimenez, a senior attorney at the Southern Environmental Law Center, calls that 2024 memorandum essentially dead 1.
Backing the finished product are Amazon, Google+0.53% — Google, up 0.53 percent today, Microsoft, Andale (a Meta+0.14% — Meta, up 0.14 percent today affiliate), the Department of Defense and North Carolina's Public Staff, the state's consumer advocate, which signed the settlement on October 7 237.
What data centers now owe
The tariff captures customers signing from June 1, 2026, onward that use 50 megawatts at 80% or more of full power, or 150 MW at any level 2. They pay cash within 60 days for equipment built only for them, owe at least 75% of their contracted power every month, sign contracts of 10 to 15 years, and face early-exit penalties running from $25 million to more than $587 million 23.
The Federal Energy Regulatory Commission, which governs transmission, accepted parallel terms from Duke Energy Carolinas on October 9 on a 4-1 vote: at least 75% of planned load for 15 years 4. Commissioner Lindsay See concurred that 75% sits "near the low end" of just and reasonable, with no security posted against a customer going bankrupt 5.
The new plants stay on the household bill
Duke projects that more than 80% of the new demand it must serve comes from data centers and other large users, and the tariff does not require those customers to pay for the new generation their load forces 2. Attorney General Jeff Jackson, who pushed for the tariff for months 2, still calls it a "massive step forward" 6. His filing lists the gaps: no separate rate class, no option to build or bring clean power 2. The tariff makes data centers cover the wires built for them; the new plants their demand forces stay in the rates everyone pays.
Duke's spending is why the fine print matters
The tariff guards a $103 billion capital program sized around 7.8 gigawatts of signed deals with Amazon, Google, Meta and Microsoft 7. Duke's quarterly grid spending has now overtaken the cash its operations bring in, so who funds that gap is the whole question 8.
Duke's quarterly grid spend has overtaken its operating cash flow
- Capital expenditure
- Operating cash flow
Data
| Capital expenditure | Operating cash flow | |
|---|---|---|
| Q3 '23 | $3.05B | $3.52B |
| Q4 '23 | $3.29B | $2.57B |
| Q1 '24 | $3.21B | $2.47B |
| Q2 '24 | $3B | $2.95B |
| Q3 '24 | $2.99B | $3.52B |
| Q4 '24 | $3.09B | $3.38B |
| Q1 '25 | $3.15B | $2.18B |
| Q2 '25 | $3.28B | $2.86B |
| Q3 '25 | $3.45B | $3.63B |
| Q4 '25 | $4.14B | $3.66B |
| Q1 '26 | $4.09B | $1.51B |
| Q2 '26 | $4.15B | $2.76B |
Duke's side, and the clock
"Data centers will pay upfront for all costs to connect to the grid," said Kendal Bowman, Duke's North Carolina president 3. See agreed the terms beat a status quo that left other customers wholly exposed, while Commissioner Judy Chang dissented that the protections fall short 54. The five-member North Carolina Utilities Commission rules by mid-November 37, ten days after Duke posts third-quarter results on November 5 9. What to watch in its order: whether a separate rate class or a clean-power option appears, or the deal is signed as written.
Deepdive
AI-generated from this story and its cited sources. Not investment advice.
