Running the Energy Department is no easy job. There are nukes to manage and, oh yes, the country's contentious move toward clean energy. Yet despite all these demands, Energy Secretary Steven Chu, who has never shied from expanding his academic reach, is nearing publication of an economics paper -- his first ever -- that could upend ideas of how energy efficiency works. And he sat down with Greenwire to say what exactly he's found. Go to story #1