Understanding Capacity Charges on Your Ohio Electric Bill

What Are Capacity Charges and Why Do They Exist?

Capacity charges are payments for the right to use the grid infrastructure during peak demand periods. Unlike energy charges (for electricity consumed), capacity charges are structural—you pay them regardless of how much electricity you use.

The Economic Rationale

PJM Interconnection argues that capacity charges ensure adequate generation supply during peak demand periods. The logic:

• The grid must have enough generating capacity to serve peak demand (usually summer afternoons when air conditioning is running)
• Building and maintaining this infrastructure requires substantial capital investment
• Generators need stable revenue to justify investing in capacity that sits idle during low-demand periods
• Capacity auctions determine how much generators require to provide this capacity

In theory, this is efficient. In practice, Ohio customers argue that capacity charges have become excessive and no longer reflect true infrastructure costs.

How Capacity Charges Appear on Your Bill

You'll see capacity charges as a separate line item on your electricity bill, typically expressed as:

• Residential: Fixed monthly charge or small per-kWh capacity adder (e.g., $15-30/month)
• Commercial: Charge based on your peak 15-minute usage multiplied by a capacity rate (e.g., 450 kW × $150/kW-year = $67,500 annual capacity charge)

For commercial customers, capacity charges can be 5-15% of total electricity bills—a substantial cost that's often invisible without detailed bill analysis.

PJM Capacity Auctions: Where Capacity Prices Are Set

Capacity prices are determined through PJM's capacity auctions, held annually for forward years. These auctions have created significant price volatility and consumer impact.

How PJM Capacity Auctions Work

PJM calculates how much capacity is needed to serve peak demand (with reserves), then holds an auction where generators bid to provide that capacity. The auction results determine capacity prices for the next 1-3 years.

Why Have Capacity Prices Surged?

• Coal plant retirements: Older coal plants are retiring, reducing available capacity
• Natural gas generator shortages: Some new gas plants have been delayed or canceled
• Demand growth: Data centers and AI computing facilities are rapidly increasing electricity demand
• Renewable uncertainty: While renewables add generation, they don't provide reliable peak capacity (sun doesn't always shine during peak demand)
• Extreme weather: Heat waves and cold snaps stress the grid, requiring backup capacity that's expensive to maintain

The capacity crisis reflects a genuine challenge: the grid needs more flexible, reliable capacity to handle peak demand, especially as coal plants retire and weather becomes more extreme. Capacity charges will likely remain elevated until new generation (natural gas, renewables + storage, or other sources) provides reliable peak capacity.

Calculating Your Capacity Charges: Understanding Your Portion of Grid Costs

Capacity charges are allocated to customers based on their contribution to peak demand. Residential customers typically pay flat monthly charges, while commercial customers pay based on their peak usage.

Residential Capacity Charges

Residential customers typically pay a bundled residential capacity charge (included in their per-kWh rate or as a separate fixed monthly fee). Your utility calculates a per-household capacity cost and allocates it equally across all residential customers.

Example: If PJM capacity prices are $250/MW-day and the total residential load is 1,000 MW, the annual capacity cost is approximately $91 million. Divided across 5 million residential customers, that's ~$18/household/year or $1.50/month.

With recent price increases, typical residential capacity charges have grown from $10-15/month to $25-35/month—a 100-150% increase in just a few years.

Commercial and Industrial Capacity Charges

Commercial customers pay capacity charges based on their peak 15-minute demand usage:

Monthly Capacity Charge = Peak 15-min Usage (kW) × Capacity Price ($/kW-month)

Example: A business with 500 kW peak demand facing $25/kW-month capacity charges pays 500 × $25 = $12,500/month = $150,000/year in capacity charges alone.

Strategies to Reduce Capacity Charges: Taking Control of Peak Demand

Unlike energy charges (harder to control), capacity charges can be directly managed by reducing peak demand. Here are proven strategies.

Peak Shaving: The Primary Strategy

Reduce your facility's peak 15-minute usage, and you reduce capacity charges proportionally. Even small reductions have outsized financial impact.

Financial Impact of Peak Reduction: A business reducing peak demand by 50 kW at $25/kW-month saves $15,000/year in capacity charges—with no reduction in total consumption. This is "low-hanging fruit" that many businesses overlook.

The Broader Debate: Are Capacity Charges Justified?

Ohio's business and residential customer groups are increasingly questioning whether capacity charges reflect true costs or are an excess profit mechanism.

Arguments for Current Capacity Charges

• Grid infrastructure must be sized for peak demand; generation capacity must exist during peak hours
• Generators need revenue certainty to justify billions in infrastructure investment
• Capacity charges encourage customers to reduce peak demand, improving grid efficiency
• Auctions are transparent market mechanisms; prices reflect supply/demand balance

Arguments Against Current Capacity Charges

• Coal retirements are not replacement failures; new gas and renewable capacity is available or being built
• Capacity prices are artificially inflated by temporary market conditions; not sustainable long-term
• Capacity charges disproportionately burden commercial customers and are unfair to small businesses
• Battery storage is now viable; grid can maintain capacity without excessive charges
• Charges lack transparency; many customers don't understand what they're paying for

Consumer Impact: Whether you agree with the economic arguments, capacity charges are a significant and growing cost. Focusing on peak demand reduction provides immediate financial relief regardless of broader policy debates.

Future of Capacity Charges: What to Expect

Short-term: Capacity charges will likely remain elevated as grid strain persists. Medium-term (5-10 years): Battery storage and new generation capacity may gradually reduce prices. Long-term: Structural reforms to capacity market pricing are possible.

Actionable Recommendations

• Commercial customers: Immediately implement peak-shaving measures (monitoring, HVAC optimization, scheduling). ROI is typically under 3 years.
• Residential customers: Avoid peak-hour usage when practical (shift laundry, charging, etc. to off-peak). Limited direct impact but behavioral awareness helps.
• All customers: Stay informed on capacity auction results and PJM policy changes. Advocate for reasonable capacity charges through public comment at PUCO.
• Long-term: Invest in battery storage or renewable generation if feasible. These reduce grid dependence and provide hedge against future price increases.