CARMEL, Ind. — Battery storage that charges from the grid should be able to use non-firm transmission service, MISO has decided.   

MISO is discarding its previous requirement that battery storage needs to secure yearly, firm point-to-point transmission service before it can charge from the grid.  (See MISO Agrees to Dial Back Tx Service Requirements for Energy Storage.)  

Manager of Resource Utilization Kyle Trotter debuted draft business practice manual language adopting the changes at a Nov. 15 Planning Advisory Committee meeting.  

Staff in October said battery storage should be treated like any other intermittent load in MISO and should be able to use as-available transmission service. That means storage owners will be free to use the less expensive non-firm, point-to-point transmission service or MISO’s Network Integrated Transmission Service for any length of time.   

Trotter said MISO hopefully will be able to incorporate the change formally by the first quarter of 2024. He said if the Planning Advisory Committee is receptive, MISO will test out the changes with the Market Subcommittee in January.  

Changes to MISO’s business practice manuals require only a review from MISO’s legal team to be implemented. They are not filed with FERC.