As of March 19, 2026, the Federal Energy Regulatory Commission (FERC) rejected a complaint from RWE Clean Energy about how PJM Interconnection calculates and assigns interconnection upgrade costs for new power projects. [1] The case involved a solar and battery project in Maryland, where RWE argued that PJM’s study process led to unexpectedly high grid upgrade costs. FERC ruled that PJM followed its approved tariff rules, but it also noted that interconnection cost uncertainty remains a broader industry concern that can affect new generation projects trying to connect to the grid. In the same session, FERC reduced the allowed return on equity for transmission owners in New England under ISO New England, lowering it from 10.57% to 9.57%, which affects utilities like Eversource Energy. The commission also approved changes in the Midwest under Midcontinent Independent System Operator related to how certain emergency-related costs are shared across the grid.
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