Electric Transmission Texas LLC (ETT) has completed a contract with NGK-Locke, Inc. for a state-of-the-art, sodium-sulfur 4-megawatt NAS® battery system, which will be installed in Presidio, Texas. ETT is a joint venture between American Electric Power (NYSE: AEP) and MidAmerican Energy Holdings Company (MidAmerican).
The NAS battery will be the first in Texas and the largest in the United States and represents part of a $67 million overall commitment by ETT to improve transmission reliability in Presidio and surrounding areas. Cost of the battery and substation is estimated at approximately $23 million. A 60-mile, 69- kilovolt transmission line from Marfa to Presidio is targeted for completion by 2012 with an estimated cost of approximately $44 million.