MISO gives 4-hour batteries a 95% capacity credit, the highest in any US ISO
BESS capacity credit by duration and ISO (% of nameplate)
Source: MISO BPM-011, PJM, NYISO, Modo Energy
Note: MISO's flat 95% means duration beyond 4 hours adds zero incremental credit. PJM uses marginal ELCC, NYISO uses zonal CAF, GB uses scaled EFC.
MODOENERGY