AI data centers could raise Seattle bills
- Analysts say planned AI data centers near Seattle could significantly increase electricity demand. - Rising demand may translate into higher bills for customers unless utilities secure new capacity or rates change. - Seattle City Light and regulators are assessing impacts as companies expand computing capacity (patch.com).
Seattle City Light is weighing a wave of proposed AI data centers that could add enough demand to push electricity costs higher for other customers. (seattle.gov) The immediate issue is scale. Axios, citing Seattle Times reporting, said five proposed data centers could draw a combined 369 megawatts at maximum demand, roughly one-third of the electricity Seattle typically uses on an average day. (axios.com) Seattle’s mayor said on April 18 that the city “has not authorized nor permitted any new data centers,” but Katie Wilson also said the prospect of large new facilities has raised concerns about environmental justice, economic resilience and higher costs for Seattle ratepayers. (wilson.seattle.gov) A data center is a warehouse full of servers, and AI systems need far more computing power than ordinary web services. That turns into a large, steady electricity load that utilities must be ready to serve every hour, not just during short peaks. (cnbc.com) Seattle City Light was already planning for faster load growth before the latest data-center debate. In its 2024 Integrated Resource Plan progress report, the utility said rising electrification and other trends increased its 2040 forecast by 238 average megawatts of energy needs and 580 megawatts of peak demand compared with the 2022 plan. (seattle.gov) City Light also said in August 2024 that it would need 1,825 megawatts of new resources in the first 10 years of its planning horizon, up from 400 megawatts in its 2022 plan. The utility said about 88% of its power comes from hydropower, with about half generated by its own hydro projects. (seattle.gov) That backdrop matters because Seattle customers are already paying more. City Light’s 2026 rates took effect on January 1 with an average 5.4% increase, and the utility said a typical residential bill would rise by about $4 a month. (seattle.gov) State regulators are moving on the same problem from the investor-owned utility side. The Washington Utilities and Transportation Commission opened Docket UE-260162 on April 7 to study how “large load customers,” including data centers, could affect utility business models, infrastructure planning and ratepayer protections. (utc.wa.gov) The commission scheduled a technical conference for April 27 and said it plans to develop guidance on large-load interconnection, including risk mitigation and protections for existing customers. The docket does not directly govern Seattle City Light, which is a municipal utility, but it shows how broadly Washington utilities are preparing for AI-era power demand. (utc.wa.gov)
