The Federal Energy Regulatory Commission (FERC) has launched a significant regulatory effort aimed at modernizing how large electricity consumers—particularly data centers and other high-demand facilities—connect to the transmission grid. Rather than advancing the Department of Energy’s proposed rulemaking from late 2025, FERC issued six separate show-cause orders directing each major ISO/RTO to either justify its existing rules or propose reforms within 60 days. The Commission argues that rapidly growing large-load demand requires faster, more transparent, and legally durable solutions to ensure grid reliability while avoiding unfair cost burdens on existing customers.
A central theme of the orders is the recognition that large loads represent a distinct class of transmission customer with unique operational and reliability impacts. FERC is pushing regional grid operators to create clearer processes for studying and connecting large loads, including facilities colocated with generation resources. The Commission also signaled support for new transmission service products that would allow flexible loads to accept curtailment during constrained system conditions, helping accelerate power delivery while reducing the need for immediate infrastructure upgrades.
Cost allocation is another major focus. FERC expressed concern that existing tariff structures may allow costs associated with serving large new loads to be shifted onto other ratepayers. The Commission is directing ISOs and transmission owners to examine mechanisms that ensure large-load customers bear an appropriate share of transmission and reliability-related costs. This approach is intended to protect residential and commercial consumers while still supporting economic development and load growth.
Resource adequacy and generation development are also receiving increased scrutiny. FERC has ordered all six ISOs/RTOs to submit reports within 30 days explaining how they plan to maintain sufficient generation resources to serve both existing customers and rapidly expanding large-load demand. This is particularly important in regions such as MISO, where data center growth has accelerated sharply in recent years. The Commission appears concerned that load growth could outpace generation additions if planning processes are not updated.
For energy market participants, the orders signal a broader shift toward accommodating data center-driven demand growth while preserving reliability and fair cost allocation. Regional approaches will likely differ, with FERC highlighting Southwest Power Pool’s recently approved CHILLS service as a potential model for flexible large-load integration. Utilities, developers, data center operators, generators, and transmission owners should closely monitor upcoming ISO filings throughout the summer, as the resulting tariff changes could significantly influence transmission planning, interconnection timelines, and future power procurement strategies.
