Colorado has a long way to go in pursuit of 100 percent green energy. An important key to a future with renewables though will be storage.
National Renewable Energy Lab (NREL)
The announcement comes a day before a Paris gathering called the "One Planet Summit" co-hosted by the U.N. and the World Bank.
Martin Keller heads the National Renewable Energy Laboratory in Golden. Its 40th anniversary comes at a time of political uncertainty under President Trump.
The president-elect's nomination of former Texas Gov. Rick Perry to lead the U.S. Department of Energy has raised concerns among clean energy advocates.