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AEP orders first 190 MW under Mainspring agreement for up to 1.6 GW

Mainspring says AEP purchased an initial 190 MW for delivery beginning in 2027 under a sales agreement covering up to 1.6 GW through 2034. The larger ceiling is not capacity already delivered, and low emissions do not mean zero carbon.

By Greener Numbers Editorial Team · Published October 25, 2026 · Updated 10/25/2026

Mainspring Energy announced on October 13 that American Electric Power signed a sales agreement for up to 1.6 gigawatts of its linear generators through 2034. AEP purchased an initial 190 megawatts for delivery beginning in 2027. The first purchase and the agreement's larger ceiling are different figures, and neither describes capacity already operating under this deal.

The supplier says the agreement extends its business beyond commercial, industrial and data-center customers into the investor-owned utility market at gigawatt scale. AEP's stated aim is to add capacity quickly to support growing energy needs. The announcement does not identify the sites for the initial units or establish their individual interconnection dates.

Utility Dive reported on October 15 that AEP could buy about 200 megawatts annually and that the units were expected online within 12 months, citing Mainspring's chief executive. Those are reported deployment expectations, not a guarantee that every project will avoid permitting, construction or interconnection constraints.

Mainspring describes the equipment as fuel-flexible, dispatchable and low-emissions. Utility Dive says it can use natural gas, biogas and hydrogen, and describes a low-temperature reaction with close-to-zero nitrogen-oxide emissions. Nitrogen-oxide emissions are not the same measure as carbon emissions; the deal does not establish that all of its electricity will be zero-carbon.

The linear-generator agreement is separate from AEP's planned 702-megawatt Bloom Energy fuel-cell project near Cheyenne, Wyoming. Utility Dive reports that project has a 20-year power contract with Google, an expected 2028 online date and plans for carbon capture. Its reported roughly $4 billion investment should not be combined with the potential value of the Mainspring agreement as if they were one purchase.

For electricity customers, these announcements show how a utility is seeking dispatchable capacity while demand grows. They do not quantify changes to a household's bill or prove that conventional ratepayers bear no risk. Delivery milestones, fuel choices, project costs and regulatory treatment remain important to the eventual customer impact.

Official source: mainspringenergy.com ↗