Pipeline capacity charges reserve interstate pipeline space for winter peak deliveries. They are paid year-round but show up most visibly in January gas bills. A typical residential customer pays $7 to $22 per dekatherm of capacity charge in winter months, on top of the commodity cost. The capacity portion is set by FERC-approved pipeline tariffs and flows through the utility regardless of supplier choice. Locking the supply rate does not insulate the capacity tag. Here is how it works.
What capacity charges pay for
Interstate pipeline capacity is a finite physical resource — gas can only flow at the rate the pipeline is sized for. Gas utilities reserve a portion of pipeline capacity for their service territory.
The reservation is paid year-round even when only winter consumption uses it. The reservation cost is set by the pipeline tariff filed with FERC. Costs are then allocated to retail customers via the utility tariff filed with the state PUC.
Why capacity charges look biggest in winter
Capacity charges are paid year-round but the winter charge per therm consumed is larger because the same fixed cost is being spread across more therms consumed.
A typical northeast residential bill shows $14 to $28 of capacity charge in January vs $4 to $8 in August. The total annual capacity cost is similar; the per-therm allocation changes with consumption.
Why locking supply does not insulate capacity
The capacity portion of the bill is regulated, not competitive. Suppliers compete on the supply (commodity) line only. Delivery, capacity, taxes, and riders are all set by the utility tariff and identical across all suppliers.
Locking the supply rate stabilises the supply portion. Capacity continues to move with FERC-approved pipeline tariff filings. The lock captures 60 to 70 percent of the bill stabilisation; the other 30 to 40 percent (delivery + capacity + taxes) moves with the regulated tariff.
Lock the rate before the next reset.
Seenra runs the supplier shortlist in 5 minutes. No credit pull, no on-site visit, no service interruption. Forever free for households.
Get my fixed-rate quote →Common questions
Quick answers from the editorial desk
Who pays for pipeline capacity charges?
Why is the capacity charge highest in winter?
Are capacity charges different for municipal gas utilities?
What is the difference between capacity and commodity charges?
Further reading