Energy Storage, Renewable Energy

Electric Transmission Texas brings battery storage project online

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Austin, Texas, April 9, 2010 — Electric Transmission Texas, dedicated the nation’s largest, and Texas’ first, utility-scale battery during ceremonies in Presidio, one of the oldest cities in Texas.

The 4-MW NAS sodium-sulfur battery storage system was energized March 31 to the Electric Reliability Council of Texas grid.

ETT is a joint venture between units of American Electric Power and MidAmerican Energy Holdings Company.

The NAS battery system represents part of an about $70 million overall commitment by ETT to improve transmission reliability in Presidio and surrounding areas. The dedication ceremonies recognized installation of the new battery system and thanked local and state leaders for the support that helped achieve approval from the Public Utility Commission of Texas.

Full utilization of the battery system, along with the recently completed Gonzales Substation, is expected to begin by this summer in time for summer peak usage. Cost of the battery and substation is about $25 million.

A 60-mile, 69-kilovolt transmission line from Marfa to Presidio is targeted for completion by 2012 with an estimated cost of $45 million. In March, ETT filed an application with the PUCT requesting a Certificate of Convenience and Necessity authorizing construction of the transmission line.

In the meantime, the NAS battery system will provide transmission backup in the event of a transmission line outage. The battery system also is designed to improve power quality and reduce voltage fluctuations.

The NAS battery system installed in Presidio will provide the following benefits:

* Due to its quick response, the battery will address voltage fluctuations and momentary outages.

* In the event of an outage on the radial transmission line providing power to Presidio, the battery can supply 4 MW of uninterrupted power for up to eight hours.

* The battery will allow Presidio’s electrical load to receive uninterrupted power from Comision Federal de Electricidad during emergency situations.

* The battery will allow for maintenance on the new transmission line being built from Marfa to Presidio without loss of electric service.

The battery modules were transported by ship from NGK-Locke, Inc. in Japan and delivered to the Port of Long Beach in December 2009.

Twenty-four trucks were then used to carry the 80 modules and ancillary equipment from California to Marfa, Texas, where they were stored until construction of the concrete building that now houses the battery system was completed. The modules were moved to Presidio in February, and installation activities began at that time.

The battery system is controlled through an S&C Electric Company Smart Grid Storage Management System, a fast-response, automatic power converter and controller that provides the ability to store energy in a variety of battery storage technologies and to control the discharge of that power into the electrical grid.