# California makes data centers account for the cost of a broken forecast > California's seven new data center laws address electricity costs, water information and local review. Their test comes when projected demand fails to materialize. By BIG CHANGE Editorial Published: 2026-09-22T06:43:20.425Z Updated: 2026-09-22T06:43:20.425Z Canonical: https://bigchange.ai/blog/california-ai-data-center-costs-electricity-water ![A data-center building connects separately to an electrical transformer and a water tank, with a blank invoice sheet in front.](https://bigchange.ai/api/media/file/data-center-infrastructure-hero-v1.png) AI-generated conceptual illustration by BIG CHANGE. AI infrastructure depends on physical power and water services, with costs that must be assigned. Conceptual illustration of a generic facility, not a project plan or evidence of lower utility bills. A proposed AI data center can change a community's electricity system before it processes a single request. Someone must plan the connection, arrange power and decide how much infrastructure the customer will eventually need. If the customer arrives late, uses less power than expected or leaves, the spending does not automatically disappear. California's new data center laws address that problem alongside water use and local planning. Governor Gavin Newsom signed seven bills on September 21, 2026. For residents and small businesses, the question is whether the rules can keep an uncertain commercial forecast from becoming a shared utility expense. Signing the package does not establish that household bills have fallen or that every required tariff is already operating. [Governor's announcement](https://www.gov.ca.gov/2026/09/21/governor-newsom-signs-most-comprehensive-data-center-laws-in-the-nation-providing-communities-more-control-on-water-electricity-and-land-use/). The package reaches data centers beyond facilities devoted to AI. Its provisions also have different thresholds, exceptions and implementation dates. Those distinctions will matter more to an affected community than a general promise that the technology industry will pay its way. We think the most consequential change concerns who bears the financial consequences when projected demand fails to materialize. Clear responsibility can make development more credible, provided regulators turn the statutory protections into enforceable obligations backed by money someone can actually collect. ## The expense can outlast the customer Consider a hypothetical project that promises to fill a large facility over several years. Its utility orders equipment and commits to electricity supply on that basis. Later, the developer loses a tenant and opens only part of the building. The operator may pay its ordinary electricity bills on time. Yet those payments may not cover the commitments made for the larger project. The dispute is about the gap: should the developer cover it, should the utility absorb it, or should other customers contribute? This problem does not require an AI crash. A delayed opening or an overambitious expansion schedule could create the same mismatch at one site while AI use grows elsewhere. A successful global market does not guarantee that every local investment will be fully used. The International Energy Agency's April 2026 analysis explains why forecasts are difficult. Efficiency per AI task is improving while uptake and more demanding applications grow. Data center demand can change faster than energy infrastructure, and actual load may differ from the connection initially requested. The IEA also finds that new demand can improve utilization and lower prices where spare capacity exists; higher demand does not inevitably mean higher rates. [IEA's current energy and AI assessment](https://www.iea.org/reports/key-questions-on-energy-and-ai/executive-summary). For a community, the useful distinction is between infrastructure a project specifically requires and infrastructure that would have been needed anyway. Allocating every shared expense to the newest customer could also be unfair. The evidence has to show what additional commitment the project caused, who benefits from it and what remains unpaid if plans change. ## Electricity protection has two parts SB 886 directs the California Public Utilities Commission (CPUC) to establish tariffs or update electric rules by January 1, 2028, preventing stranded costs or shifts to other customers. Its transmission-interconnection provisions cover data centers entering new agreements for retail service at that level from January 1, 2027. They assign upgrade costs through a commission-determined methodology, subject to federal-law limits. Refunds depend on realized load and net revenues, with an annual cap. Departure within ten years or inadequate demand ramp-up triggers an early-termination fee. The commission must also require disclosure of duplicate applications for the same project in other territories or jurisdictions. [SB 886, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB886). AB 2383 addresses generation commitments. It requires payment mechanisms lasting at least ten years, upfront collateral or prepayment, cancellation and early-exit fees, and minimum payments if usage undershoots projections. The CPUC sets the electrical-corporation generation tariff's demand threshold, which cannot exceed 25 megawatts. That tariff excludes publicly funded research and national-security facilities, public-safety and publicly owned facilities, and specified utility facilities. Community choice aggregators and electric service providers must adopt their own qualifying generation tariffs by January 1, 2028; their thresholds also cannot exceed 25 megawatts. [AB 2383, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2383). A tariff is the approved set of charges and service conditions. Its practical value depends on the details. A promise to cover a shortfall is stronger when funds are available before the shortfall appears. Conversely, a fee owed by an insolvent project may provide less protection than its face value suggests. The implementation should make the difference visible. These are separate exposures: connecting a customer to the grid and procuring electricity to serve it. Covering one does not prove the other has been paid. Residents should expect a clear explanation of both when officials describe a project as financially self-supporting. SB 1168 adds a broader assessment requirement. It directs the CPUC to examine rate structures covering data centers' reasonable share of network and procurement costs, including facilities connected at either transmission or distribution level, while relieving residential cost pressures. That is a duty to assess opportunities, not evidence of a completed rate reduction. [SB 1168, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB1168). ![A simple site plan and orange eraser sit apart from a transformer fixed to concrete beside a blank bill.](/api/media/file/forecast-lasting-cost-inline-v1.png) ## Water needs an operating plan as well as a payer Paying for a pipe does not establish that enough water will be available during a drought. Financial responsibility and physical supply are different questions. AB 2469 conditions local approvals for new data centers and expansions that increase maximum peak water use on specified submissions and commitments. They include a water-supply assessment, projected use, efficiency measures and workforce information. Applicants must assume the full cost of necessary water-infrastructure improvements, as determined by the supplier. A water-scarcity plan becomes required beginning January 1, 2028. Satisfying these conditions does not compel a local government to approve the project. [AB 2469, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2469). AB 2619 links forecasts to ongoing reporting. Before an initial local business-license, equivalent-instrument or permit application, operators must give their water supplier good-faith estimates, including source and maximum-day, maximum-month and average-year volumes. Initial business-license applications also require estimates; renewals require the previous calendar year's use and cooling-system information under penalty of perjury. Its data center categories include small facilities, unlike some electricity provisions. [AB 2619, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2619). Our practical test is whether a resident can follow the plan through a difficult season. Which supply would serve the facility? What would it reduce if water became scarce? Who would decide that a reduction was necessary, and who would verify compliance? An annual average alone cannot answer questions about a project's busiest day. Comparing a forecast with later use helps establish whether the original estimate was realistic. Deciding whether the permitted allocation was appropriate, or whether another user should receive priority, still requires a separate judgment. ## More information does not mean every detail becomes public AB 1577 requires energy reporting to the California Energy Commission and estimates for relevant local discretionary approvals. Its definition excludes facilities below ten megawatts of electrical capacity; it also exempts specified public, research, safety, national-security and utility facilities. The commission must publish annual information in anonymized, aggregated form, with its data center load assessment beginning in the 2029 integrated energy policy report. The law protects specified customer information. Residents should not mistake state reporting for a promise of an unrestricted, customer-by-customer public database. [AB 1577, chaptered text](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB1577). SB 887 changes environmental review. It bars categorical exemptions for covered data center development, with specified facility exclusions. It also permits qualifying projects to seek environmental-leadership certification and associated streamlining, subject to conditions including upfront interconnection payment, energy and water requirements, and enforceable community benefits. This does not require every project to receive a full environmental impact report or prohibit every faster review route. [SB 887, chaptered text](https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202520260SB887). Communities will therefore need to ask which process applies to a particular proposal and what information is available through it. A statewide aggregate can show a trend while leaving local questions unresolved. An enforceable agreement can create a useful obligation while still requiring staff and resources to monitor it. ## A fairer project still has to prove its case The optimistic outcome is a development process in which a serious operator can explain its demand, fund the extra infrastructure it needs and make commitments that survive a disappointing opening. That could give communities better grounds for accepting worthwhile projects. It could also distinguish a credible proposal from one whose economics depend on shifting risk elsewhere. Complex proceedings could also delay investment without producing clear obligations, and reporting could become an administrative exercise that nobody uses. Companies might choose other locations, moving pressure on water and electricity elsewhere. These outcomes remain uncertain; the signing establishes the policy, while its effects will emerge through implementation. For residents, local businesses and prospective developers, we would look for four concrete pieces of evidence: - A project-specific explanation of which network and power-supply commitments its forecast creates. - A payment arrangement that explains who covers cancellation, delay or underuse, including how financial security remains adequate. - A water plan that connects the projected demand to available supply and decisions during shortages. - A way to compare the promised benefits and resource use with subsequent performance, together with an identified body responsible for enforcement. California has assigned more of these questions to formal regulatory and permitting processes. The test will come when a project's forecast changes and the responsible parties must show, in actual payments and operating decisions, who carries the difference. ## Sources - [Governor of California: September 21 data center legislation](https://www.gov.ca.gov/2026/09/21/governor-newsom-signs-most-comprehensive-data-center-laws-in-the-nation-providing-communities-more-control-on-water-electricity-and-land-use/) — September 21, 2026 announcement confirms the seven-bill package. It presents the administration's policy case; the final statutes control the article's discussion of scope, dates and obligations. Signing does not establish measured consumer savings. - [IEA: Key Questions on Energy and AI, executive summary](https://www.iea.org/reports/key-questions-on-energy-and-ai/executive-summary) — April 2026 analysis explains uncertain demand, changing AI efficiency and infrastructure timing. Its discussion of spare capacity qualifies claims that growth inevitably increases prices. This is global analysis, not an evaluation of California's new laws. - [SB 886: California Technology Innovation and Ratepayer Protection Act](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB886) — Chapter 438, approved September 21. Sections 945.2 and 945.3 establish tariff duties and transmission-interconnection conditions. The operational dates and federal-law qualifications matter; the text leaves methodology and implementation to the commission. - [AB 2383: Electricity and data centers](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2383) — Chapter 435, approved September 21. Sections 945.5 and 945.6 address generation cost responsibility. Provider-specific provisions, thresholds and exemptions must be read separately. The statute does not set a universal fixed 25-megawatt threshold. - [SB 1168: Data center rate structures](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260SB1168) — Chapter 440, approved September 21. Requires assessment of rate structures, including transmission and distribution connections. Its intended relief for residential customers is not an observed reduction in anyone's bill. - [AB 2469: Data center water-use disclosures](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2469) — Chapter 436, approved September 21. Government Code section 65964.7 sets conditions for covered approvals. The scarcity-plan date is distinct from the other conditions; satisfying them does not create an entitlement to approval. - [AB 2619: Water resources and data centers](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB2619) — Chapter 437, approved September 21. Establishes supplier and licensing disclosures and updates water-shortage planning. Initial estimates and renewal reporting serve different purposes; the statute's facility categories differ from other bills in the package. - [AB 1577: Data center reporting](https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB1577) — Chapter 434, approved September 21. Specifies energy reporting, facility exclusions and privacy protections. State publication is aggregated and anonymized; the 2029 assessment is a future reporting milestone, not current measured performance. - [SB 887: Environmental review and leadership projects](https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202520260SB887) — Chapter 439, approved September 21. Changes categorical-exemption eligibility and permits conditional leadership certification. A full environmental impact report is not universally mandated. 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