Piedmont Natural Gas Cuts NC Rates, Saving $100 a Year

Piedmont Natural Gas lowered North Carolina residential rates for the fourth time in 2026, reducing average annual bills by roughly 8%, or $100, as commodity costs ease.

A June 1 rate cut of 4.35% is the fourth Piedmont Natural Gas reduction applied to NC customers in 2026, saving approximately $54 per year on its own.
Combined 2026 decreases lower the average residential bill by roughly 8%, totaling about $100 in annual savings for North Carolina households.
All Piedmont Natural Gas rate adjustments in North Carolina are reviewed and approved by the North Carolina Utilities Commission.

Lead

Piedmont Natural Gas, the Charlotte-based natural gas distributor and subsidiary of Duke Energy, reduced rates for North Carolina residential customers effective June 1, 2026 — the fourth rate cut the utility has applied this year. The latest adjustment lowers the average residential bill by approximately 4.35%, or about $54 annually, bringing the cumulative 2026 reduction to roughly 8%, or $100 per year for the typical household. Customers will see the cut reflected in June bills, with the full impact flowing through in subsequent months.

What Happened

The June rate adjustment marks Piedmont's fourth consecutive downward revision to NC residential tariffs in 2026, following reductions implemented in January, February, and April. Each adjustment has been tied to declining natural gas commodity costs, which are passed through to customers under the utility's purchased gas adjustment mechanism — a regulatory structure that links retail rates to wholesale market prices.

The latest 4.35% reduction compounds earlier cuts to produce cumulative annual savings of approximately $100 for the average North Carolina residential customer, compared with rates in effect at the start of the year. Piedmont Natural Gas serves roughly 1.1 million customers across North Carolina, South Carolina, and Tennessee.

Regulatory Context

All rate changes for North Carolina customers must pass review by the North Carolina Utilities Commission (NCUC). The commission's oversight ensures that commodity cost reductions flow through to end-users rather than accruing to utility margins. In a separate 2024 rate case, the NCUC approved a settlement that set Piedmont's authorized return on equity at 9.80%, establishing the earning baseline against which pass-through adjustments are measured.

The frequency of 2026 reductions — four in under six months — reflects unusual downward volatility in wholesale natural gas markets, which retreated from the elevated levels seen in 2022 and 2023. Residential customers in North Carolina are direct beneficiaries of this commodity deflation under the current tariff structure, which is designed to adjust quickly in either direction as wholesale prices move.

Strategic Context

Duke Energy (NYSE: DUK), which completed its acquisition of Piedmont Natural Gas in 2016, continues to operate the subsidiary as a standalone regulated gas utility. Rate decreases of this magnitude can compress near-term revenue per customer, but because Piedmont earns returns on its rate base — the value of invested infrastructure — rather than on commodity volumes, declining pass-through costs do not erode the regulated return framework. Infrastructure investment and the authorized ROE remain the primary earnings drivers.

The successive 2026 reductions also arrive as state utility commissions across the Southeast face heightened scrutiny over affordability for lower-income households, making visible energy cost relief politically and regulatorily significant for the company's relationship with North Carolina policymakers.

Outlook

Piedmont Natural Gas has delivered four consecutive rate reductions in 2026, with combined NC utility tariff cuts of roughly 8% producing approximately $100 in annual savings for the average residential customer. Further adjustments will depend on wholesale natural gas price movement and NCUC review. As long as commodity costs remain below prior-year levels, customers can expect the pass-through mechanism to sustain current energy cost relief, though market reversals could reverse the trend. Duke Energy's regulated return structure limits both upside and downside earnings exposure from these commodity swings.

Mentioned tickers: DUK

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