Beyond energy and balancing, the grid needs services that maintain the physical infrastructure. The power grid services market includes voltage support (reactive power), congestion management, and black start services. These services ensure that power can be transmitted over long distances without overheating lines or causing voltage collapse. As grids become more stressed (due to renewables and load growth), the power grid services market is expanding.

The broader ancillary services power market includes this segment. A key service is "voltage support" or "reactive power." AC power systems require reactive power (measured in VARs) to maintain voltage levels. The power grid services market for reactive power is typically provided by generators (by adjusting excitation) and by capacitors or static VAR compensators (SVCs). The power grid services market for "reactive power" is often compensated through regulated tariffs, not competitive markets.

Another key service is "congestion management." When a transmission line is overloaded, the system operator must redispatch generators (increase generation on one side of the constraint, decrease on the other). The power grid services market for "congestion" is managed through "locational marginal pricing" (LMP). The power grid services market for "transmission" rights (FTRs) allows market participants to hedge against congestion costs.

The power grid services market for "black start" services is critical for grid restoration after a total blackout. A black start resource can start up without external power (e.g., a diesel generator, a hydro plant, or a battery). The power grid services market for "black start" is procured by utilities and system operators for specific critical plants. The power grid services market for "system restoration" plans are tested periodically.

The power grid services market also includes "fault ride-through" capability. Generators and inverters must be able to withstand voltage dips and continue operating (rather than tripping offline), helping to stabilize the grid during faults. The power grid services market for "grid code" compliance is mandatory, not compensated. The power grid services market for "inertia" (as mentioned) is also a physical property that supports grid stability.

Looking ahead, the power grid services market will see the deployment of "synchronous condensers" (motors that spin without a load) to provide inertia and short-circuit strength in areas with high inverter-based resources. The power grid services market for "STATCOMs" (static synchronous compensators) provides fast voltage support. As the grid becomes more inverter-based, the power grid services market for "grid-forming" inverters (as discussed) will be essential for maintaining a stable voltage reference. The power grid services market is the silent, often overlooked, foundation of reliable power.

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