On November 25, 2025, FERC accepted the Midcontinent Independent System Operator, Inc.’s (MISO) proposal to expand the number of interconnection requests MISO may study under its temporary, fast-tracked generator interconnection process. FERC concluded that the proposal will help ensure interconnection customers are able to interconnect to the MISO transmission system in a reliable, efficient, and timely manner.
In July 2025, FERC accepted revisions to MISO’s Open Access Transmission, Energy and Operating Reserve Markets Tariff (Tariff) to permit MISO to implement its proposed Expedited Resource Addition Study (ERAS). ERAS provides a framework for the expedited study of certain generator interconnection requests that address urgent resource adequacy and reliability needs in the near term and is distinct from MISO’s general three-phase generator interconnection process, which studies interconnection requests in clusters. The ERAS process, which will sunset on August 31, 2027, caps at 68 the total number of interconnection requests that may be studied under ERAS and limits the number of interconnection requests that may be studied per quarter to 10.
In its proposed Tariff revisions, MISO sought to raise the number of ERAS interconnection requests it may study during each quarter from 10 to 15, arguing that doing so will enable it to study ERAS interconnection requests in fewer quarterly study periods and allow ERAS interconnection requests to reach the generator interconnection agreement stage faster. MISO further explained that its proposed revisions strike a reasonable balance between limiting its own workload per quarterly study period and allowing MISO to work through interconnection requests faster.
FERC accepted MISO’s proposed Tariff revisions, finding that they were consistent with FERC’s prior order accepting the ERAS process. FERC also affirmed that MISO’s proposal was still consistent with FERC’s final rules on generator interconnections, including Order Nos. 2003 and 2023, because the Tariff revisions will ensure that interconnection customers are able to interconnect to the MISO system in a reliable, efficient, and timely manner. FERC concluded that the proposed revisions will allow generation to interconnect more quickly and meet MISO’s resource adequacy and reliability needs earlier.
FERC’s full order, issued in Docket No. ER25-3543-000, can be accessed here.