How Does Grid Capacity Impact Business Energy Costs?
Grid capacity impacts business energy costs because the grid must maintain enough power supply to meet peak demand, and the cost of keeping those resources available is passed on to customers through capacity charges built into electricity rates. Understanding how capacity auctions work can help you better understand what goes into your business's monthly energy costs.
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Key Takeaways
Grid capacity is the amount of power the grid must reserve to meet peak demand. Think of it as the grid’s insurance policy that makes sure enough reliable electricity is available during the busiest, most power-hungry hours. The costs of maintaining this reserve are set through annual capacity auctions. Capacity makes up a portion of your commercial electricity rates, directly influencing your overall business energy costs.
- Capacity auctions help ensure enough electricity is available during periods of peak demand.
- Auction results directly influence your business energy rates and capacity charges.
- Higher electricity demand and power plant retirements can lead to long-term increase in capacity costs.
- Regional capacity costs can vary significantly depending on grid conditions and available energy sources.
- Proactive energy procurement can help your businesses manage rising capacity costs.
What Is Power Grid Capacity?
Power grid capacity reflects the maximum amount of electricity the grid can generate and deliver at any given time. While energy measures the actual amount of power used, capacity exists to ensure enough resources are available to meet peak demand. This safeguard helps Regional Transmission Organizations (RTOs) and Independent System Operators (ISOs) maintain a reliable grid and prevent outages during high-usage periods.
Think of the power grid like a highway system, for example. The lanes represent grid capacity – too many cars at once can cause a traffic jam, similar to how an uptick in demand strains the grid. Capacity auctions ensure there will be enough “lane space” to keep power flowing smoothly under any conditions.
How Is Capacity Priced in the Energy Market?
Capacity costs are set through annual auctions run by RTOs or ISOs. These organizations use peak demand forecasts to determine how much generation will be needed to guarantee future grid reliability. Capacity auction results are factored into commercial electricity rates, typically representing 10–30% of a fixed-rate contract depending on your market and usage profile. Businesses can handle capacity costs in different ways by choosing predictable, all-inclusive fixed-rates or a more transparent pass-through approach.
All-Inclusive Fixed Rates vs. Capacity Passthrough
How Will Capacity Passthrough Charges Appear on My Bill?
If you choose a capacity passthrough plan, you will find these costs listed as a separate line item under the utility service fees on your monthly bill. It’s important to note that capacity charges will vary by market and are updated based on the results of your regional capacity auction. Understanding how capacity auctions work can help you anticipate changes in your annual energy costs.
What Is a Capacity Auction, Exactly?
In most deregulated regions, the capacity market exists to make sure there’s enough generating capacity to meet future energy demands. This market structure focuses on long-term planning and grid reliability. Each year, capacity auctions are held where energy providers submit bids for contracts to supply power during peak demand periods.
Capacity auctions are run by Regional Transmission Authorities (RTOs) or Independent System Operators (ISOs) with the support of third-party independent market monitors to keep things fair. This process exists to make sure future energy needs are met, especially during extreme weather and high-demand seasons. The results of each auction impact regional energy costs and help identify essential infrastructure upgrades.
Key Differences: Capacity Market Vs. Energy Market
While the energy market focuses on the real-time sale of power, the capacity market supports long-term planning and grid reliability. Understanding how the differences between energy and capacity markets can help you better manage your total business energy costs.
How the Capacity Market Impacts Your Business
Capacity market auctions impact your business energy costs, even if you’ve never heard of them. The auction process determines which power generators get paid to stay prepared for high-demand periods, like hot summer afternoons when air conditioning usage spikes. The results of a capacity auction don’t just stay with power plants; they’re passed down through your energy supplier and built into your commercial energy rates.
Depending on your energy contract, capacity charges can show up as part of fixed all-in pricing or can vary based on how much energy you consume. When capacity prices increase, your business’s energy bills will likely increase as well, even if your usage stays the same. Understanding how the capacity market works empowers you to make more informed decisions when choosing a new energy plan.
The Capacity Auction Process in 4 Steps
Capacity auctions are held every year to secure capacity for 1-3 years in advance, depending on the market. Here’s a simple breakdown of how the capacity auction process works, from generator bids to the charges that appear on your monthly bill.
1. Energy Providers Submit Capacity Bids
2. Bids are Reviewed by Authorities
3. Contracts are Awarded to Providers
4. Suppliers are Paid During the Delivery Year
Differences in Regional Capacity Markets
While the basic capacity auction process is similar, each deregulated market varies slightly. Learn more about the unique characteristics of capacity auctions in different ISOs and RTOs across the United States.
Rising Pressures in U.S. Capacity Markets
Capacity markets are facing difficult challenges as the grid continues to evolve. Coal and nuclear power plant retirements are decreasing national supply while demand forecasts surge due to rapid AI and data center growth. With supply gaps widening, it’s becoming harder for ISOs to meet peak demand without relying on expensive forms of back-up power.
ISOs are also struggling to fairly value emerging technologies, like battery storage and demand response within auctions. These technologies have the potential to improve grid reliability, but outdated market rules limit their participation. Additionally, the Minimum Offer Price Rule (MOPR) forces renewable energy sources to bid at higher prices. This stifles their competition and makes it harder to integrate clean energy resources into the market. These challenges have led to rising capacity costs in many deregulated markets.
Case Study: PJM Capacity Auction Results 2025-2026
As a result of the most recent PJM capacity auction, capacity charges for June 2025-May 2026 increased by 833%. This means that businesses in PJM’s service area can expect their monthly bills to increase by up to 29% during the 2025-2026 delivery year.
Why exactly did this capacity auction have such high results? With PJM, more fossil fuel and nuclear power plants have retired than new generators have come online. Decreased supply paired with skyrocketing demand forecasts means PJM customers are stuck with expensive capacity charges until generation can catch up with demand.
As a result, PJM has established a capacity auction collar, or a pricing floor and ceiling, to help protect consumers and stabilize costs. However, consumers will have to wait until the next capacity auction to see the results of this new regulation.
What Is the Future of Capacity Markets?
Capacity markets are beginning to shift focus on integrating cleaner energy resources and new grid management technologies. Battery storage and demand response are two key strategies being used to improve grid reliability. More renewable energy projects coming online will also help address supply shortages.
Market rules and policies are also changing to support a more modern grid. For example, PJM’s new auction floor and cap are designed to help stabilize costs while new generation projects are underway. As green energy and storage technologies grow, capacity markets must adapt to ensure the grid remains both reliable and affordable for all consumers.
Reduce the Impact of Rising Capacity Costs
While you have no control over rising capacity charges, you do have control over how your business consumes energy. Here are a few recommendations to reduce the impact of a volatile capacity market:
Invest in Energy Efficiency
Participate in Demand Response
Consider On-site Renewables
Monitor Your Energy Usage
Get Help from an Expert
Protect Your Business in an Evolving Market
Understanding the capacity market gives your business a clearer view of energy costs and potential savings opportunities. With a proactive energy strategy, you can reduce the business impact of rising prices and market shifts. At Integrity Energy, we help businesses navigate these changes with personalized solutions.
About the Author 
Tim Trus
