The California Energy Commission has the generator fleet at 26203 Production Avenue itemised: 28 emergency units, 26 of them rated 2.75 MW, up to 76.6 MW in total, which is also the estimated capacity the City of Hayward attached to the project when its Planning Commission approved it on 22 May 2025. The permission runs under Major Site Plan Review SPR-23-0036, drew no appeals, and did not require a City Council vote - a point local opponents have pressed. A three-storey building of roughly 318,700 sq ft is going up on the site, alongside a single-storey security building, a generator yard and an on-site substation taking supply from Pacific Gas & Electric. The backup figure moved during review: the environmental notice filed on 24 March 2025 gave 67.2 MW before the approved total settled at 76.6 MW.
A three-storey data centre building of about 318,700 sq ft with a security building, generator yard and on-site substation, under Major Site Plan Review SPR-23-0036, approved by the Planning Commission on 22 May 2025.
How much backup generation is permitted?
Twenty-eight emergency generators of up to 76.6 MW combined, 26 of them 2.75 MW units, per the California Energy Commission application.
Why do two different capacity figures circulate?
The environmental notice of 24 March 2025 cited 67.2 MW of backup generating capacity. The figure was revised upward to 76.6 MW by the time of approval.
What is the local planning position?
Approved without appeal in May 2025 and under construction through 2026. The approval did not go to a City Council vote, which is the focus of a local opposition campaign.
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