Clean Peak's quantity multiplier quadruples in summer and winter

Seasonal Peak Period discharge window and quantity multiplier, plus Modo's modeled cheapest charge window for a hypothetical merchant battery

Season Season dates Discharge window Quantity multiplier Hypothetical charge window
Spring Mar 1 – May 14 5–9pm 1x 12pm–4pm
Summer May 15 – Sep 14 3–7pm 4x 2am–6am
Fall Sep 15 – Nov 30 4–8pm 1x 1am–5am
Winter Dec 1 – Feb 28 4–8pm 4x 1am–5am (near-tie vs. midday)
Source: 225 CMR 21.05(3), (4), (6)(a), Massachusetts Department of Energy Resources.
Hypothetical charge window is Modo's own analysis, not a regulatory figure. It is the cheapest 4h block for a hypothetical merchant battery, based on average hourly ISO-NE day-ahead prices across 2025 business days in that season.
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