POWER & REGULATION
New Large Data Center Load Policy
Tariff Proceeding
Under Review
Overview
Seattle enacted Ordinance 127473, establishing retail rate schedules and a new customer class and service conditions for data centers whose demand constitutes a New Large Load.
Key Details
Docket Number
2026 proposed rate ordinance
Regulatory Body
Washington Utilities and Transportation Commission
Filing Date
Fri Aug 21 2026 12:00:00 GMT+0000 (Coordinated Universal Time)
Current Status
Under Review
Technical Details
Utility:
Seattle City Light
RTO / ISO:
Customer Class
New or expanded data centers meeting Seattle City Light's New Large Load criteria
Load Threshold
10 MVA threshold for the new data-center large-load policy. The separate land-use moratorium uses 20 MVA and should not be entered in this utility-rate record.
Contract Term
Customer-specific service agreement for the life of the service arrangement; no universal number of years verified in the public ordinance record.
Financial Security
Customer must enter a service agreement accepting responsibility for infrastructure and related costs over the service arrangement; no universal security amount verified.
Exit Fees
10 MVA threshold for the new data-center large-load policy. The separate land-use moratorium uses 20 MVA and should not be entered in this utility-rate record.
Curtailment Terms
10 MVA threshold for the new data-center large-load policy. The separate land-use moratorium uses 20 MVA and should not be entered in this utility-rate record.
Cost Allocation Provisions
10 MVA threshold for the new data-center large-load policy. The separate land-use moratorium uses 20 MVA and should not be entered in this utility-rate record.