Test time (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories mechanical engineers Nathan Schroeder, left, and Luke McLaughlin, right, discuss the design of a thermal energy storage system with CSolPower co-founder Walter Gerstle, center. Sandia is testing CSolPower’s thermal energy storage system at the National Solar Thermal Test Facility. Credit Photo by Craig Fritz/Sandia National Laboratories Usage Restrictions Media use with credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.