Fossil Generation Could Rise with Faster-Than-Expected Growth in Data Center Power Demand: IEA
Note: Other regions include the New York Independent System Operator (ISO), New England ISO, Florida, Southwest, Northwest, California ISO, and Southwest Power Pool ISO regions. Electricity load by region is measured as net energy for load in the STEO.
Electricity demand has been rising steadily since 2020 after more than a decade of little change. Between 2020 and 2025, U.S. electricity demand, as measured by net energy for load, grew about 1.7% annually compared with 0.1% annual growth between 2005 and 2019. Electricity use by data centers is driving the electricity demand growth. Continued development of these large computing facilities and growth from expanded industrial use of electricity are likely to continue driving growth in U.S. electricity demand in the near term. In this analysis, we explore the potential impact of faster-than-expected electricity demand growth, while assuming the same future generating capacity as the February Short-Term Energy Outlook (STEO).
Our February STEO reflects the latest forecasts published by grid operators PJM and the Electric Reliability Council of Texas (ERCOT) and uses forecasts for economic activity and weather to arrive at our baseline forecast for electricity load. ERCOT manages the grid covering most of Texas, and PJM manages the grid covering all or part of 13 states (Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia) and Washington, DC. In our February STEO, we forecast that U.S. electricity load will increase by 1.9% in 2026 and 2.5% in 2027. We expect that the highest load growth will be in the ERCOT and PJM regions where forecast growth of annual electricity load averages 10% and 3%, respectively, between 2025 and 2027.
Grid managers are responsible for regulating the interconnection of new generating capacity and new large load customers to ensure that future electricity demand can be accommodated by the available supply of power. If demand were to grow faster than supply, the stresses on the grid would be evident in spikes in wholesale power prices or even periods of rolling…
March 4, 2026 — Texas state tax revenue from oil and natural gas was down considerably during February 2026 when compared with a year ago, while the state’s overall sales tax income was up nearly 4-percent.

