A Department of Energy national lab developed a battery that now powers some hybrid and electric cars. But how do new energy technologies get from the lab to the market? Transferring technologies from the DOE to private companies isn't always easy. Barriers such as the "valley of death"—a gap between the end of public funding and the start of private funding—can stop a transfer. The DOE has taken steps to address barriers, such as providing training on transferring technologies. But, it could better measure the progress of its technology transfer efforts. We recommended developing performance goals and measures for technology transfers.