What is demand response on the power grid?

How it works

The U.S. Energy Information Administration (EIA) defines demand response programs as incentive-based programs. By its definition, they encourage electricity customers to temporarily reduce their demand at certain times in exchange for lower bills. In some programs the system operator can reduce a customer's load directly. In others the customer stays in control.

Grid operators run their own versions. PJM Interconnection, a regional grid operator, describes its demand response program as voluntary. It compensates retail customers for reducing their electricity use when PJM asks. Those requests come during periods of high power prices or when the reliability of the grid is threatened. The payments reach customers through PJM members called curtailment service providers.

Why it matters for data centers

A data center can take part by pausing or moving computing work. Google said in August 2025 that it first did this by shifting non-urgent tasks away from periods when the grid is strained. Processing a YouTube video is one such task, it said. It said new agreements with the utilities Indiana Michigan Power and the Tennessee Valley Authority were its first to target machine learning workloads.

Google argues that flexible demand lets large electricity users connect to the grid more quickly. It argues this also reduces the need for new power plants and transmission lines. It also says there are limits, because services such as Search and Maps, and cloud customers in fields like healthcare, need high reliability.

Where things stand in 2026

Demand response has also been written into a large power deal. Google and Constellation said the commercial agreement they announced on October 6, 2026 includes demand-response capabilities. They said these can cut non-critical power use when the grid is under heavy stress.

Cuts ordered by a grid operator are a different thing. In a proposal filed on August 13, 2026, PJM described an emergency procedure. It would tell utilities to reduce or transfer the demand of new large customers that have not brought their own new power supply. That step would come ahead of any action that would shut off traditional customers. Those cuts would also come before PJM calls on its Load Management customers. Those customers are paid in advance to reduce their use in emergencies. PJM asked federal regulators to accept the proposal within 60 days.