Inside of it is a system that helps solve one of the key problems in the renewable industry: how to store power for longer periods of time in an economical way. 

We've told you how solar and wind demand is booming. But sometimes it's not windy, or the sun isn't shining.

This disrupts the ability of renewable generators to provide a steady stream of current.

Now, the headquarters of Konterra, previously best known as the Laurel, Md.-based property developer serving the DC metro area, is home to one of the first renewable energy storage systems in the U.S. capable of not only storing generation when the sun's not shining, but also delivering power to the local electric grid.