New York City and Long Island led September's reference prices, at $115/MW-day and $99/MW-day; every other zone sat between $65 and $71

Reference price by NYISO zone, four-hour BESS, September ($/MW-day)
$60/MW-day$135/MW-day
Source: NYISO, Modo Energy
Note: Reference price = RCP + REAP. REAP is the zonal Day-Ahead TB4 spread / 4. RCP uses 2026-27 CHPE-In accreditation factors for 2026 and 2025-26 factors for 2025.
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MODOENERGY