When Oregon Governor Kate Brown signed Executive Order 17-20 in the fall of 2017, she set Oregon on the path to addressing climate change by ramping up efficiency in Oregon’s buildings. Addressing building efficiency is a critical climate action strategy as commercial and residential structures account for 40% of carbon globally. Her order calls for a number of specific actions including that Oregon should “establish an aggressive timeline to achieve net zero energy ready buildings as a standard practice in buildings across the state.” Zero energy (ZE) buildings are highly efficient and only consume as much energy as is produced through onsite renewables (usually solar panels) over the course of a year. Zero energy ready buildings have efficiencies on par with ZE projects, but don’t yet have sufficient onsite renewables.