Greentown Labs gains support in guiding Houston to cleaner future FacebookTwitterEmail 1of3 Greentown Labs CEO Emily Reichert (left) gives Houston Mayor Sylvester Turner a tour of the Greentown Labs Houston, the local branch of the Massachusetts-based clean-energy incubator, that will be in the renovated old Fiesta grocery store in Midtown Tuesday, Feb. 2, 2021, in Houston.Steve Gonzales, Houston Chronicle / Staff photographerShow MoreShow Less 2of3 A sign in Greentown Labs Houston gives highlights of construction that is underway Tuesday, Feb. 2, 2021, in Houston.Steve Gonzales, Houston Chronicle / Staff photographerShow MoreShow Less 3of3 As Houston, the world’s longtime energy capital, tries to maintain its crown during the transition from fossil fuels to cleaner energy, Greentown Labs is offering an increasingly stronger push.