(WRXX) – On Thursday, the Illinois Commerce Commission (ICC) accepted the recommendations of an ICC Staff Report directing Ameren Illinois to study the benefits and costs of continued participation in the Midcontinent Independent System Operator (MISO), a regional transmission organization, versus participation in PJM Interconnection, another RTO.
According to ICC Chairman Carrie Zalewski, MISO’s most recent capacity auction for the June 1, 2022-May 31, 2023 delivery year fell short of meeting resource adequacy requirements to cover load plus required reserves for Zone 4, putting upward pressure on wholesale pricing and increasing utility bills for central and southern Illinois customers.
She said the ICC feels it is appropriate to explore whether membership in MISO continues to provide net benefits to Ameren Illinois’ electricity customers.
In 1997, the Illinois General Assembly enacted the Electric Service Customer Choice and Rate Relief Law of 1997, significantly restructuring Illinois electric industry, opening Illinois energy markets to competition.
The law allowed certain Illinois’ electric utilities owning and controlling transmission or providing transmission services in Illinois to choose membership in a regional transmission organization without oversight by the state.
MISO manages the electricity transmission system in 15 states and one Canadian Province.