Designed by RNL, the U.S. Department of Energy's National Renewable Energy Laboratory in Golden, Colorado, has a matrix of innovative features. When the U.S. Dept. of Energy’s National Renewable Energy Laboratory in Golden released its 506-page RFP for a non-negotiable LEED-Platinum-certified office building, it wasn’t clear how something jammed full of sustainable elements would take shape. The RFP laid out not what the building should look like but how it should perform; it was up to the design-build team to come up with the rest. At 222,000 sq ft, the Research Support Facility, completed in June, is the largest net-zero-energy