Designing large load tariffs to protect ratepayers' costs

RMI (Perez, Wang, Shwisberg) published a review of 65 state-level large load tariffs and identified five common safeguard provisions intended to protect other ratepayers from cost shifting.

• Main announcement/action: RMI authors analyzed 65 state-level tariffs using data from Halcyon’s Large Load Tariff Tracker and identified five safeguard provisions—Minimum Contract Term, Minimum Monthly Billing Demand, Collateral Requirements, Exit Fees, and Capacity Reassignment—with concrete examples such as Kentucky Power’s 20-year minimum contract for new loads ≥150 MW and 22 of 65 tariffs specifying Load Ramp Periods (usually 4–5 years).
• Background and details: The review found 37 of 65 tariffs include collateral requirements (common range 12–24× the customer’s largest monthly bill or dollar-per-MW approaches), Dominion Energy’s GS-5 requires $1.5 million collateral per MW (reducible up to 70% for strong credit), 31 tariffs include exit fees, and 12 include capacity reassignment; the data source and linked tariff filings are provided for verification.