HPEV Solar Cell (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The HPEV cell's extra back outlet allows the current to be split into two, so that one part of the current contributes to solar fuels generation, and the rest can be extracted as electrical power. Credit Credit: Berkeley Lab, JCAP Usage Restrictions Credit: Berkeley Lab, JCAP License Licensed 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.