The Public Service Company of New Mexico (PNM) demonstration project installed an energy storage system composed of two elements: a 0.5MW Smoothing Battery utilizing Ultra Batteries and a 0.25MW/0.99MWhr Peak Shifting Battery utilizing Advanced Lead Acid Batteries, both manufactured by Ecoult/East Penn Manufacturing. These two systems combined with a single 0.75MW Power Conditioning System, are co-located with a separately installed 500kW solar PV plant, at a utility-owned site, to create a firm, dispatchable, renewable generation resource.

This hybrid resource provides simultaneous voltage smoothing and peak shifting through advanced control algorithms and switches between two configurations, end-of-feeder and beginning-of- feeder. The project has successfully demonstrated a variety of applications, including PV firming, peak shaving, energy arbitrage, optimized energy shifting selecting from the above application as well as simultaneously smoothing PV output. It has gathered close to 1 TB of 1 second interval data over 2 years from a variety of field points. Its control algorithms are securely importing real time market, system and feeder data and optimize operation of the BESS on a real time automated basis based on prioritized listing of applications. The project has also developed sophisticated dynamic modeling tools which are used to calibrate and optimize the battery system control algorithms. These models have furthered the understanding of feeders with storage and distributed generation on an industry wide basis and over 18 technical publications have stemmed from this project. The site is located in southeast Albuquerque. Results and real time data feeds are available at

Lead-acid Battery