Five grid operators are still pricing it like it can't — using a gas turbine's run time, a decade-old peak shape, or a pure cost shortcut instead of its own performance.
ERCOT
CAISO
SPP
MISO
NYISO
Already doing more
Tumbleweed (CA): 4 hrs → 8 hrs, in months.
APS (AZ): raised its own battery standard to 6-8 hrs.
Georgia Power: pivoting to 12-hr storage by 2033.
NYSERDA (NY): funding a 100-hr battery today.
ERCOT
4-hr Non-Spin rule
Sized to a gas turbine, despite ERCOT's own monitor urging 1 hour.
CAISO
4-hr credit ceiling
Credit stops at 4 hours, no matter how long it actually runs.
SPP
4-hr tier cutoff
2-hr batteries capped near 50% credit; only 8-hr+ clears full value.
MISO
Flat 95% credit
A 4-hr and an 8-hr battery earn identical credit today.
NYISO
2-hr reference unit
Prices off a 2-hr battery, though NY's own study found peak needs run to 9.