VPP vs. Gas Peaker

A gas peaker plant costs $100-200 million, runs 5-15% of hours, and exists to meet the highest few gigawatts of demand on the hottest and coldest days. A virtual power plant aggregates thousands of distributed devices to provide equivalent capacity at a fraction of the capital cost. The economics increasingly favor VPPs for short-duration peaks, but peakers still dominate for sustained high demand.

The cost comparison. A 100 MW gas peaker costs roughly $100 million to build and $80-120/MWh to operate (mostly fuel). A 100 MW VPP enrolling 20,000 homes with batteries and smart thermostats costs the aggregator $30-50 million in customer acquisition and software, with near-zero fuel cost. On a $/kW basis: peaker at $1,000/kW versus VPP at $300-500/kW.

The duration gap. A peaker runs as long as fuel flows, potentially 8-12 consecutive hours during an extended heat wave. A VPP's home batteries discharge in 2-3 hours. Smart thermostats provide load reduction for 1-2 hours before comfort limits bind. For a 4 PM-7 PM summer peak, a VPP is sufficient. For a multi-day polar vortex, it is not.

At what point does a VPP fully replace a peaker plant?

When storage duration exceeds the peak event. If home batteries grow to 4-6 hours and EV batteries participate via vehicle-to-grid, VPPs could cover most peak events. But grid planners must provision for worst cases (multi-day extremes), and VPP availability depends on voluntary customer participation. The likely equilibrium is VPPs handling 60-80% of peak events while a smaller fleet of firm peakers covers the rest.

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