Demand side projects in PJM providing frequency regulation

Valley Forge, Pa., November 21, 2011 — PJM Interconnection received the first frequency regulation services from small-scale demand resources under new rules allowing smaller projects to participate in PJM’s Regulation Market. The two western Pennsylvania projects use diverse technologies.

To provide regulation service to PJM, demand resource provider Enbala Power Networks uses water pumps at a wastewater treatment facility in Washington County, Pa., adjusting its water pumps up or down to match PJM’s regulation signal.

The other project from Viridity Energy uses building load and a behind-the-meter battery in New Castle, Pa. The battery responds to the PJM signal — either charging or discharging as appropriate.

Regulation service corrects for short-term changes in electricity use that might affect the stability of the power system. It helps match generation and load and adjusts generation output to maintain the desired frequency. Previously, system operators have relied on flexible generating resources to vary output to balance system frequency.

In October, the Federal Energy Regulatory Commission approved rule changes that reduced the minimum required amount of resources to 100 kW, from the previous minimum of 500 kW.

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