Integrating renewable resources such as solar photovoltaic (PV) onto the grid can create challenges for system operators. Fortunately, energy storage technologies have been identified as a potential resource to help operators deal with their intermittent nature.
The Public Service of New Mexico (PNM) is addressing this issue as part of a smart grid demonstration project it is conducting with the Electric Power Research Institute (EPRI) and the U.S. Department of Energy’s (DOE’s) smart grid energy storage program with two related projects. First, PNM is demonstrating a system that uses energy stored in batteries to mitigate voltage fluctuations through battery smoothing and manage peak demand through battery shifting simultaneously. Second, PNM is collaborating on a demonstration of a commercial building micro-grid designed and built by the Japanese government’s New Energy and Industrial Technology Development Organization (NEDO).
Major System Components
Combined with the 500-kW PV installation, PNM’s energy storage system is comprised of Ecoult/East Penn Manufacturing Synergy advanced lead batteries with an energy rating of 1 MWh for shifting and UltraBattery advanced lead batteries with embedded ultracapacitors and a power rating of 500 kW for smoothing. The UltraBattery is built for quick response, operating at a high discharge and charge rate.