1. Large Load Tariff Approved to Protect Ratepayers from Data Center Cost-Shifting The board approved IID's new Large Load Tariff, designed to ensure that large electricity consumers — primarily data centers and other computational loads — pay their own way and do not burden existing ratepayers. The tariff applies to customers with a load factor of 80% or higher (reduced from an initial 85% threshold after stakeholder feedback), which is calibrated to capture computational/electronic loads while excluding conventional industrial users such as mineral extraction or manufacturing facilities that may operate near 70%. The tariff was developed over nearly a year with input from multiple IID departments, outside legal and technical consultants, and a 30-day public comment period that generated 243 comments. Supporting documents include a large load queue service request process, cost responsibility agreements, feasibility and full application forms, and confidentiality/non-disclosure agreements. Provisions address co-located generation, queue management for non-advancing developers, potential clustering, and IID's right to reserve service interruptions.
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