The commercial and industrial (C&I) sector of the U.S. economy is the #1 emitter of energy-related greenhouse gases (GHGs). The REBA Institute’s Small to Medium-Sized Business (SMB) Accelerator will hasten the decarbonization of the U.S. power system by helping SMBs set ambitious climate and energy targets and successfully procure renewable energy. Building on the success of the Institute’s affiliate, the Renewable Energy Buyers Alliance (REBA—a trade organization), the REBA Institute—a 501(c)(3)—will develop a training program tailored to the needs of SMBs, create freely available resources for U.S.-based SMBs, and empower 80-100 SMBs to procure clean energy through cohort-based training modules. The SMB Accelerator will scale the movement of C&I buyers transforming the U.S. electricity system to reduce GHG emissions and avert the worst of climate change.