It Takes Energy to Make Energy (image) Stanford University Caption It takes energy to make energy technologies, like the lithium-ion battery that helps power this Chevrolet Volt. Net energy analysis calculates how much energy a technology produces and consumes over time to assess its long-term sustainability. Credit Mark Shwartz/Stanford University Usage Restrictions Graphics, photographs and videos are provided subject to the following restrictions: Graphics, photographs and videos provided by the Precourt Institute for Energy at Stanford University are to be used - with appropriate credit - for editorial purposes only. Flopping, altering, editing or otherwise embellishing these images and audio clips in any way that changes the editorial content of these images and audio clips is prohibited. Permission is for one-time use only. Supplied image file must be deleted after use 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.