This bill amends RCW 19.29A.010 and adds new sections to chapter 19.29A RCW to require utilities and regulators to treat costs and risks of electricity investments caused by very large customers as borne solely by those customers. It directs the Utilities and Transportation Commission (for investor‑owned utilities) and the Department of Commerce (for consumer‑owned utilities) to each develop, by June 30, 2027, a separate model tariff for retail customers that are "large energy use facilities" (defined in the text as facilities using or able to use 20 megawatts or more). The model tariff must be distinct from other commercial or industrial tariffs, either allocate costs proportionally to the costs of serving those facilities or assign those costs directly to the facility, meet stated public interest conditions, and mitigate the risk of cost shifts to other customer classes. Beginning January 1, 2028, an electric utility that serves a large energy use facility must enter into a contract for electricity service consistent with the model tariff; the bill adds contract and procedural requirements. Contracts with a duration of ten years or longer must specify the start date (or estimated start date) for service, obligate the large customer to pay a minimum amount or percentage of projected usage as determined by the commission, and meet any other public‑interest conditions required. A contract may include a charge for excess demand in addition to the tariff schedule. Consumer‑owned utilities that executed qualifying contracts on or before the section’s effective date are treated as in compliance if those contracts meet the stated criteria. The provisions apply to contracts entered into after December 31, 2027, and to earlier contracts if providing service requires significant investments or costs after January 1, 2028 that could increase costs or risks to other customers. The act also creates a biennial reporting requirement: by September 1 of each odd‑numbered year the department must report to relevant legislative committees on trends in load requirements and implications from large energy use facilities and other large retail consumers, protecting proprietary information; that reporting requirement expires January 2, 2036. The text provides many statutory definitions (for example, "large energy use facility" = 20 megawatts or more) and assigns roles to the commission, department of commerce, governing bodies of consumer‑owned utilities, investor‑owned utilities, and consumer‑owned utilities. Several contract provisions and the referenced public interest conditions are cited but not fully shown in the extracted text, and the bill header references an expiration date not present in the provided excerpts.

If this becomes law, very large electricity customers (facilities using 20 megawatts or more) will be put on their own separate tariff and generally be made to bear the costs and risks of the grid investments needed to serve them instead of those costs being spread to other ratepayers. Utilities must have model tariffs in place by June 30, 2027 and must sign contracts for service to these customers beginning January 1, 2028; long-term contracts (10 years or more) will include a start date and a commission-determined minimum payment obligation and can include excess-demand charges. Utility regulators and the governing bodies of consumer utilities must weigh impacts on other customers and on clean-energy requirements, and the department of commerce will report every other year through 2036 on trends and implications. The practical effect is that large customers will likely face higher and more predictable direct costs and carry more investment risk (including minimum payment obligations), while other retail customers should face less chance of having those costs shifted onto their bills. Utilities and regulators will have new workload to design, approve, and monitor these tariffs and contracts. Some important implementation details—specific contract terms, the text of subsection (2), the exact effective dates for certain provisions, and any stated expiration date mentioned in the bill header—are not included in the available excerpts, so how some parts will be applied in practice remains unclear.