Microsoft Corporation (Microsoft or applicant) was granted a Small Power Plant Exemption (SPPE) from the California Energy Commission’s (CEC) jurisdiction to proceed with local approval rather than requiring certification by the CEC for the San Jose Data Center (SJDC or project).
The applicant proposes to construct and operate a 396,914 square foot data center, located at 1657 Alviso-Milpitas Road in San Jose, California near an existing power plant and wastewater treatment facility. The project would consist of two single-story data center buildings. To provide reliable operation of the project in the event of loss of electrical service from the local electric utility provider, Pacific Gas and Electric Company (PG&E), the project includes 224 renewable natural gas (natural gas) generators each rated at 0.45 MW output capacity to provide electrical power to support the data center uses during utility outages, certain onsite electrical equipment interruptions or failure, and for load shedding, demand response and behind-the-meter resource adequacy ancillary services. The maximum electrical load of the project would be 99 MW, although the estimated load is 77 MW, inclusive of information technology (IT) equipment, ancillary electrical/ telecommunications equipment, and other electrical loads (administrative, heat rejection, and safety/ security). In addition, the project includes two Tier 4 diesel-powered generators (designated as administrative generators), with a 1.25 MW standby generator for the northern building and a 0.5 MW standby generator for the southern building. The project also includes an onsite 115 kilovolt (kV) substation located in the northwestern corner of the project site with two 115 kV underground electrical supply lines (approximately 0.2 mile) that would connect to PG&E’s Los Esteros Substation, located adjacent to the site. The project would require offsite linears for potable water, reclaimed water, stormwater, sanitary sewer, natural gas, and electrical.