The short answer
The capacity charge pays power plants and demand resources to be available during peak demand. In PJM, NYISO, ISO-NE, MISO it's a separate line item or rolled into supply. Residential: 1-3 cents/kWh. Commercial >50 kW: 15-40% of total bill, billed by Peak Load Contribution (PLC) set during prior summer peaks.
The capacity charge is what you pay for grid reliability — your share of payments to power plants and demand resources that stand ready to deliver electricity during peak demand. In capacity-market regions (PJM, NYISO, ISO-NE, MISO), capacity is a separate line item or rolled into the supply rate. For residential customers it's 1-3 cents/kWh; for commercial customers with peak demand >50 kW, capacity can be 15-40% of total electricity bill.
How capacity is charged
Residential: utility default service rolls capacity into the per-kWh supply rate. Most customers don't see a separate line item.
Commercial: capacity is usually a separate kW-month charge based on Peak Load Contribution (PLC). The capacity-market-pjm-ercot-explained guide covers PJM mechanics.
Texas (ERCOT): no formal capacity market. Reliability is funded through scarcity pricing in the energy market.
Why capacity varies year to year
PJM auctions capacity 3 years ahead. Cleared prices range from $30/MW-day to $330/MW-day historically. 2026 prices are at the high end due to constrained supply + retiring coal.
Higher cleared prices flow directly to all customer bills the following delivery year.
2025-2026 PJM capacity auctions cleared at unprecedented levels — flowing to 8-15% retail electricity rate increases in PA, OH, MD, DC, NJ, DE.
How to reduce capacity charges
Residential: difficult to target specifically because the capacity allocation is buried in the supply rate or rolled into a single delivery line. Time-of-use rates partially capture peak avoidance benefits — by shifting consumption away from afternoon peak hours, TOU customers pay lower effective capacity costs without seeing it as a separate line item.
Commercial customers with peak demand above 50 kW: curtail during 5CP peak hours (PJM) or 4CP peak hours (ERCOT). The capacity-tag-management-pjm-ercot guide has the full operational playbook. Typical savings of 15 to 30 percent on the capacity-charge component, which can equal 5 to 15 percent of the total electricity bill on demand-heavy facilities.
Demand response participation: enroll your facility in a utility or aggregator demand-response program. You get paid to curtail load during grid stress events (typically 5 to 25 events per year, 2 to 4 hours each). Payments range from $30 to $200 per kW of curtailable load. The demand-response-rebate-guide covers residential and commercial programs.
For high-usage residential customers (large homes, EV charging, pool pumps): TOU rate plans plus active load shifting can cut effective capacity exposure. The how-to-shift-electricity-usage-off-peak guide covers the load-shifting playbook with smart thermostats, smart plugs, and timer-based scheduling.
Infographic
Capacity charge reduction levers — by customer class
Why 2025-2026 capacity charges hit record highs
PJM 2025-2026 capacity auction cleared at $269.92 to $329.17 per MW-day depending on zone — roughly 7 to 10 times higher than the $35 to $50 per MW-day prices that prevailed for most of the 2010s. Three drivers stacked: coal-plant retirements removing baseload generation faster than replacement is built, slow interconnection of new gas and renewable resources, and data-center load growth in zones like Northern Virginia accelerating demand.
The auction price flows to all PJM customers in the relevant delivery year (June 2025 through May 2026 for the most recent clear). Residential customers in Pennsylvania, Ohio, Maryland, New Jersey, and Delaware are seeing 8 to 15 percent total bill increases because of the capacity-charge component, even when supply rates are locked.
For 2026-2027, PJM auction outcomes will determine whether prices stabilize or rise further. Some grid analysts expect another high-priced clear because the underlying supply-demand imbalance has not resolved; others expect new generation projects to clear the queue and bring prices down. The capacity-market-pjm-ercot-explained guide tracks the auction calendar and outcomes.
Capacity markets vs energy-only markets — the structural difference
PJM, NYISO, ISO-NE, and MISO operate capacity markets that pay generators to be available even if not running. ERCOT (Texas) operates an energy-only market that relies on scarcity pricing in the energy market to incentivize new capacity. The two structures produce different bill compositions for customers.
In capacity-market regions, customers pay a separate capacity charge (or a capacity component buried in supply or delivery). The advantage is reliability — generators are paid to keep plants ready for peak conditions. The disadvantage is the cost overhead and the volatility when auctions clear high.
In ERCOT, customers do not pay capacity charges directly. They are exposed to scarcity pricing during shortage events, where wholesale electricity prices can spike to $5,000 to $9,000 per MWh. February 2021 was the most extreme example — Texas customers on real-time pricing plans saw individual bills of $5,000 to $50,000 for a single week.
Most US households are in capacity-market regions and pay capacity costs as part of their regulated rate structure. Whether the capacity-market or energy-only structure produces lower long-term bills is genuinely debated by economists; both have proponents and critics.
Recap
Bottom line
The capacity charge is the line item that pays for grid reliability — your share of payments to power plants and demand resources that stand ready to deliver electricity during peak demand. In PJM, NYISO, ISO-NE, and MISO regions it is a separate billed item or rolled into the supply or delivery rate. For residential customers it typically runs 1 to 3 cents per kWh; for commercial customers above 50 kW it can be 15 to 40 percent of the total bill.
For residential customers facing rising 2025-2026 capacity charges driven by record PJM auction clears, the cleanest defense is locking a fixed-supply contract (which insulates the supply portion regardless of capacity-market dynamics) and reducing kWh through efficiency. The capacity-market-pjm-ercot-explained and how-to-lower-your-electric-bill guides cover both moves. Commercial customers with active load management can target capacity-tag reduction through curtailment during 5CP or 4CP peak hours.
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