While reading the definition in the District or Campus Guidance on what is a DES, it is not clear as whether one can consider each energy source an isolated DES or all the energy sources aggregate as one for a individual building. This affects enhanced commissioning when considering the 20% threshold. If one breaks every energy source as an independent DES, then one can exclude upstream equipment from having to be commissioned. My understanding is that the DES must be aggregate, but the definition is open for this interpretation. Any guidance on this issue will be valuable.