Demand-Response Programs Can Lower Utility Bills, but Beware of On-Site Power Restrictions, Experts Say

Why It Matters

The restrictions limit data‑center participation in demand‑response, curbing potential cost savings and emissions reductions while accelerating the shift toward battery storage solutions.

Key Takeaways

• Virginia law mandates demand‑response for loads ≥25 MW
• EPA limits generator use: 100 hours total, 50 hours non‑testing
• ISO/RTO jurisdiction blocks most data‑center generators from demand‑response
• Upgrading to Tier 4 emissions standards costs $100k‑$500k per engine
• Battery storage grew 32% YoY to 10 GWh in Q1 2026

Pulse Analysis

Demand‑response programs have become a key tool for utilities to balance grid stress, especially in regions like Virginia where data centers concentrate massive electricity loads. By obligating Dominion Energy and Appalachian Power to offer these programs to customers drawing 25 MW or more, the state aims to shave peak demand and lower wholesale power prices. However, the effectiveness of such programs hinges on the ability of large facilities to curtail consumption quickly, a capability traditionally provided by on‑site diesel generators.

Regulatory constraints now complicate that picture. The EPA’s recent interpretive letter caps generator operation at 100 hours annually, with only 50 hours allowed for non‑testing purposes, and excludes facilities under Independent System Operators such as PJM Interconnection. Consequently, the majority of U.S. data‑center generator capacity cannot be tapped for demand‑response. To meet the stricter Tier 4 emission standards required for non‑emergency classification, retrofits can run $100,000‑$500,000 per engine, a prohibitive expense that pushes operators toward alternative solutions.

Battery energy storage offers a cleaner, increasingly economical path. The sector installed nearly 10 GWh in the first quarter of 2026—a 32% year‑over‑year increase—driven by policy incentives and utility procurement mandates. Virginia’s new legislation targets more than 21,000 MW of storage by 2045, encouraging commercial and industrial sites to supply stored power. This shift not only sidesteps emission‑related penalties but also enhances grid resilience, positioning battery storage as the preferred asset for future demand‑response participation.