JGM1 and JGM2 are TSO-assigned codes that define how your BESS can be used to deliver ancillary services.

Here’s a quick summary of nuanced differences that can have a big impact on revenue:

JGM1:

• The TSO can adjust both your operating state and power (charge/discharge/stop).
• You specify energy potentials (delivery/absorption) across a sequence of intervals, creating an energy window the TSO can use flexibly.
• Great if you want to maximize flexibility revenues.

JGM2:

• The TSO can adjust power only, in the direction you allow for each 15-min interval.
• You choose one direction per interval (either up or down). No portfolio-style energy windowing across intervals.
• Simpler, with lower operational risk, but fewer value-capture paths.

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JGM1 or JGM2: How TSO codes shape your flexibility

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