The Synthetic Inertia Market Failure: Why Physics Needs a Price Signal
Problem Definition
Synchronous generators provided grid inertia as an unpriced byproduct of electricity generation. As these are retired, the grid loses inertia — creating a critical infrastructure gap. Current solutions (fast batteries, synchronous condensers) cost 10x more than the historical inertia provision but markets do not value this service.
The result: grids with high renewable penetration face increasing frequency instability risk, while solutions exist but are economically undeployed. This is a classic market failure where the service (inertia) is essential for system stability but invisible to price signals.
Root Causes
Energy-only wholesale markets price MW of power, not physical properties like inertia
Grid operators have no budget authority to procure inertia as a distinct service
Capacity markets in some regions compensate generation, but do not differentiate for inertia provision