SB 978 directs the California Public Utilities Commission to create a special electric rate structure for ‘large‑scale energy users’—principally data centers taking transmission‑level service with estimated peak demand of at least 75 megawatts. The rate design must protect other customers from cost shifts, require the data center to pay the electrical corporation’s upfront transmission or distribution upgrade costs (which may not be recovered from other customers), and enable utility‑administered prefunding of a 15‑year contract to procure new, incremental, zero‑carbon dispatchable resources.
The bill also treats construction of covered facilities as public works for prevailing‑wage purposes, imposes biannual certified‑payroll reporting to the commission, mandates a skilled and trained workforce, and restricts onsite generation to backup solar, wind, or battery systems with fire‑protection agreements. For grid planners, developers, and compliance officers, the bill ties rate concessions and grid access to both capital‑cost responsibilities and labor compliance — a package that reshapes commercial terms for very large data center projects in California.
At a Glance
What It Does
Requires the CPUC to adopt a tariff for data centers with transmission‑level service and an estimated peak of at least 75 MW that protects other customers, shifts upfront upgrade costs to the data center, allows separate assessment of generation vs. T&D charges, and lets utilities prefund 15‑year zero‑carbon reliability contracts.
Who It Affects
Large hyperscale data center operators and developers seeking new transmission interconnections, investor‑owned electrical corporations, local fire departments (for battery safety agreements), and construction contractors on those projects who must meet prevailing‑wage and skilled‑workforce rules.
Why It Matters
SB 978 ties access to special rates and grid upgrades to both capital payments and labor standards, changing the commercial calculus for locating very large data centers in California and forcing utilities and regulators to design new recovery, procurement, and compliance processes.
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What This Bill Actually Does
SB 978 is a conditional market entry tool: it authorizes the California Public Utilities Commission to set a special tariff for very large data centers (defined by the bill as facilities with an operational requirement of at least 75 megawatts that take transmission‑level service). The tariff package is explicitly protective of other customers — the CPUC must prevent cost‑shifting — and requires the data center to fund the electrical corporation’s upfront transmission or distribution upgrade costs needed to serve the new load.
The bill prohibits the utility from recovering those upfront upgrade costs from its other customers.
The bill also links the tariff to clean‑resource procurement and reliability. It allows the data center’s rate structure to prefund, through the electrical corporation, a 15‑year contract to install new, incremental zero‑carbon resources that can operate as dispatchable reliability assets in the utility territory.
SB 978 distinguishes generation charges from transmission and distribution charges on customer bills so the procurement and cost allocation can be handled separately.On-site energy rules limit a covered large‑scale energy user to using on‑site solar, wind, or battery storage only as backup; battery systems must be backed by a binding agreement with the local fire department addressing fire protection and emergency response for nearby communities. The bill applies its tariff only to facilities whose new transmission interconnection agreements are established after the tariff’s adoption (or on a later date the CPUC sets), which creates a clear cutoff for which projects can opt into the new regime.Crucially, SB 978 converts construction of these covered facilities into a public‑works‑like project for prevailing‑wage purposes.
Contractors must pay prevailing wages (with standard apprentice exceptions), keep certified payroll records, and submit digital copies of certified payrolls to the commission twice a year; the commission will keep those records as public records for five years. Enforcement pathways include Labor Commissioner civil wage and penalty assessments within 18 months of project completion, private actions by underpaid workers, and joint labor‑management committee suits.
The bill also mandates that every tier of contractor use a ‘skilled and trained workforce’ as defined in the Public Contract Code.
The Five Things You Need to Know
The special tariff targets facilities with an operational requirement of at least 75 megawatts and transmission‑level electrical service; smaller projects are outside the bill’s scope.
The data center must pay the electrical corporation’s upfront transmission or distribution upgrade costs, and those upfront costs may not be recovered from other utility customers.
The tariff can prefund a 15‑year contract, procured through the electrical corporation, to add new, incremental zero‑carbon resources that function as dispatchable reliability assets.
Contractors must submit certified payroll records to the commission biannually on July 1 and December 31; the commission will retain those records as public records for five years.
Onsite generation is limited to solar, wind, or battery storage used only as backup; battery installations require a binding agreement with the local fire department covering fire protection and response times.
Section-by-Section Breakdown
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Definitions — Data center and exclusions
This subsection defines ‘data center’ as facilities primarily housing electronic equipment and using environmental control systems, but it explicitly excludes publicly funded research, public safety, national security, publicly owned facilities, and certain telecommunications provider assets. The practical effect is to focus the bill on commercial hyperscale data centers while leaving government and specialized facilities outside the regime.
Definitions — Facility, large‑scale energy user, and skilled workforce
The bill defines ‘facility’ as contiguous property under common ownership with an operational requirement of at least 75 MW, and it excludes facilities that add load solely by switching from fossil fuels to renewables or transportation electrification. It also imports the Public Contract Code definition of ‘skilled and trained workforce,’ tying construction labor standards to an existing statutory framework.
CPUC tariff design and cost‑shift protections
Subdivision (b) directs the commission to create a special rate structure for qualifying data centers that (1) protects other customers and prohibits cost shifts, (2) requires the data center to pay upfront for required transmission or distribution upgrades, and (3) prevents utilities from recovering those upfront costs from their other customers. Practically, the CPUC must design a tariff and associated contract or interconnection terms that allocate capital costs to the new customer while maintaining rate fairness for incumbent customers.
Tariff applicability and onsite generation rules
This subsection limits the tariff to facilities whose new transmission interconnection agreements are executed after the tariff’s adoption (or a later date the CPUC sets). It also restricts onsite generation to solar, wind, or battery storage used only as backup, and requires battery storage operators to secure a binding fire‑protection agreement with the local fire department covering the battery system and emergency response for nearby communities. These provisions affect project design, emergency planning, and which projects can opt into the tariff.
Prefunding zero‑carbon dispatchable resources and bill separation
The bill enables the data center’s rate structure to prefund a 15‑year contract with the electrical corporation to install new, incremental zero‑carbon resources that act as dispatchable reliability assets. It also requires separation of charges typically included in the generation portion of a bill from transmission and distribution charges, enabling distinct procurement and accounting treatment for the reliability resources procured under the tariff.
Labor: prevailing wage, payroll records, and enforcement
Subdivision (d) treats covered facility construction as a public‑works project for prevailing‑wage purposes notwithstanding certain Labor Code exclusions. It requires contractors to pay prevailing wages (with registered‑apprentice exceptions), to maintain certified payroll records, and to submit those records to the commission twice a year. Enforcement mechanisms include Labor Commissioner civil wage and penalty assessments within 18 months of project completion, private actions by underpaid workers, and joint labor‑management committee suits; willful violations must be remedied with restitution and penalties, but the bill allows facilities to remain eligible for the tariff if restitution and fines are paid.
Contracting, awarding‑body limits, and skilled‑workforce mandate
The commission must require electrical corporations to flow the subdivision’s labor requirements into interconnection agreements. The entity that engages the construction contractor is not treated as an awarding body for broader public‑works rules, but the contractor is the awarding body for limited purposes. Finally, the bill mandates use of a skilled and trained workforce at every tier for construction, making labor‑compliance a precondition to accessing the tariff.
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Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Ratepayers overall — protected from bearing upfront transmission or distribution upgrade costs because the bill prohibits utilities from recovering those costs from other customers.
- Workers on covered construction projects — the prevailing‑wage, apprentice, certified‑payroll, and skilled‑workforce requirements raise labor standards and create enforcement pathways for underpaid workers.
- Grid reliability planners and operators — the prefunded 15‑year contracts for new, incremental zero‑carbon dispatchable resources provide a clear procurement mechanism to add dispatchable capacity tied to large new loads.
Who Bears the Cost
- Data center developers/operators seeking new transmission interconnections — they must fund upfront grid upgrades and may need to prefund lengthy contracts for reliability resources, increasing project capital requirements.
- Contractors and subcontractors on covered projects — obligated to pay prevailing wages, use a skilled workforce at every tier, maintain certified payrolls, and face enhanced enforcement exposure.
- Electrical corporations and the CPUC — required to design and implement new tariff structures, track and retain payroll records, incorporate labor requirements into interconnection agreements, and manage prefunded procurement, creating administrative and procurement burdens.
Key Issues
The Core Tension
The central dilemma is whether California should condition privileged grid access and preferred procurement (a special tariff and prefunded reliability contracts) on making large data centers carry the full capital and labor costs of their grid impact. That approach protects ratepayers and workers but raises project capital and compliance costs that could discourage new investment or push developers to other jurisdictions; conversely, loosening those obligations would lower barriers to entry but could shift upgrade costs to ratepayers or erode labor standards.
SB 978 bundles three different policy levers — rate design, procurement for reliability, and labor enforcement — into a single eligibility package for special utility service. That bundling raises multiple implementation questions.
First, the bill requires utilities to refuse cost recovery for upfront upgrade costs from other customers but to accept prepayments or prefunding from the data center; regulators will need to specify acceptable payment structures, credit security, and accounting treatment to avoid stranded costs or unintended shifts to rates over time. Second, the ‘15‑year prefunded contract’ raises procurement and contract‑management risks: who procures the zero‑carbon dispatchable resource, what procurement rules apply, how are performance obligations structured, and what happens if the resource underperforms or the customer defaults on prefunding?
On the labor side, treating covered projects as public‑works‑like raises jurisdictional and enforcement friction with existing Labor Code definitions (the bill itself carves out projects that already are public works). Practical compliance questions include how the commission will process and secure biannual certified‑payroll submissions while preserving any legitimate confidentiality needs, how it will coordinate enforcement with the Department of Industrial Relations and the Labor Commissioner, and how the skilled‑and‑trained‑workforce requirement will be verified across multi‑tiered subcontracting.
Finally, limiting onsite generation to backup use and excluding load increases that are merely fuel‑switching or electrification may discourage certain resiliency strategies and complicate decarbonization tradeoffs for projects attempting to pair onsite clean generation with off‑site procurement.
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