New data centres and large loads seeking transmission-level interconnection can connect through Electric Rule 30, California's first standardized transmission-level interconnection tariff, interim-approved by the CPUC on July 24, 2025. Applicants who agree to fund necessary transmission infrastructure upfront can benefit from accelerated grid connections rather than a slower case-by-case review, shaving months off the permitting process.
Also active in California: PG&E's data centre demand pipeline has grown to roughly 10 GW, with 1.4 GW already in final design for 2026-2030 delivery, and PG&E estimates every 1,000 MW of new data centre demand can reduce customers' monthly bills by 1-2 percent by spreading fixed grid costs over more usage. Microsoft is building a 77 MW San Jose data centre with onsite natural gas generators for backup and demand response.
Named Projects Already Underway
| Customer | Location | Details |
|---|---|---|
| Microsoft | San Jose, CA | 77 MW data centre including onsite natural gas generators for backup power and demand response |
| Prologis | San Jose, CA | 400 MW data centre campus and manufacturing facility, part of a group of San Jose data centre projects |
Figures compiled from the Edison Electric Institute's "Large Load Projects and Tariffs" (September 2026) member-company summary and public regulatory filings. Confirm current tariff terms directly with Pacific Gas and Electric Company and the relevant state public utility commission before relying on any figure for a capital decision.
Weighing California against another state or a Canadian province with a different rate and interconnection picture entirely? Run both sides of the comparison through our licensed AI data centre cost configurator — it applies each jurisdiction's actual power rate, tax treatment and large-load tariff rules to the same seven build configurations.
Model This State on Your Own Site
Every figure above comes from the same power-cost and tariff dataset behind the SCR AI Build Configurator — a licensed, embeddable widget that models seven data centre build configurations against all nine Canadian provinces and all 50 US states plus DC, returning capital expenditure by line item, energy cost, revenue by commercial structure, EBITDA and payback.
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