AEP Plans $4B Wyoming Fuel Cell Build, 1.6 GW Mainspring Buy
AEP will buy up to 1.6 GW of Mainspring linear generators, a deal worth up to $4 billion, and plans a separate $4 billion, 702-MW Bloom fuel cell project in Wyoming for Google, Utility Dive reports.
Market Impact
Mainspring Energy said Oct. 13 that AEP can buy about 200 MW a year over eight years, with an initial 190-MW delivery set for next year. Mainspring CEO Tom Linebarger told Bloomberg Tech the units are expected online within 12 months. The generators come in standard 2.5-MW configurations and can run on natural gas, biogas or hydrogen. By our math, 190 MW is about 76 units, and 200 MW a year is about 80 units. The order is Mainspring’s largest to date and its first move into the investor-owned utility market.
AEP said Oct. 14 that it will spend about $4 billion on the 702-MW Cheyenne Fuel Cell project under a 20-year power purchase agreement with Google. The project will use Bloom Energy fuel cells and includes plans for carbon capture. AEP expects to start construction this year and bring the project online in 2028. Cheyenne Fuel Cell is about 92% owned by AEP, with funds advised by Basalt Infrastructure Partners holding the rest. Google’s agreements with Black Hills Corp., which owns a utility serving the Cheyenne area, took effect Sept. 30.
What the source does not say: where the Mainspring units will be installed, whether they sit behind the meter, who holds the EPC or subcontract packages for either project, and how the fuel will be supplied to the Wyoming site.
What It Means for Subcontractors
- Civil and foundations: Our inference is that 2.5-MW modular units mean repeat pad and foundation work. At about 80 units a year, that is a steady cycle of small pours rather than one large package. The source does not name sites.
- Pipefitting and mechanical: Mainspring units can burn natural gas, biogas or hydrogen, so fuel-line tie-ins are likely. The Wyoming project’s fuel supply is not described, so gas-side scope there is unconfirmed.
- Electrical and E&I: Interconnection and commissioning labor follows delivery. The first 190 MW is scheduled for next year, and the Wyoming project’s 702 MW is targeted for 2028. Those are the two dates to build crew and testing capacity around.
- Cheyenne timing: AEP says construction starts this year, so site mobilization and early civil work would come first if that holds. The source names no GC or EPC, and the roughly $4 billion budget is the only size signal for the scope.
- Carbon capture: The Wyoming project includes carbon capture plans, which would add process piping and equipment scope. The source gives no design or schedule for that piece.
- Contract caveat: The 1.6 GW is “up to,” and the roughly $4 billion value is a ceiling. Only the 190-MW first delivery has a stated timeline, so plan around that tranche.
