On October 16, 2015, the Federal Energy Regulatory Commission issued Order No. 816, 1 refining the policies and procedures relating to the wholesale sales of energy, capacity, and ancillary services at market-based rates (generally, "MBR" authority). Much of the Order simply clarifies and codifies existing practice or provides guidance on areas that were previously vague, but the Order sets forth a number of new provisions that will affect the filing entities.