The treatment of DES guidance issued in Aug 2010 says the following:

"Commissioning of the district energy systems serving the building are required for larger buildings where the thermal energy supplied to the building exceeds a given percentage, or when the percentage of energy provided by the district plant to the building exceeds a given threshold"

Do any of you know what this percentage or threshold is ? In our case 8% of the output of the DES is supplied to the building we are working on. Does that mean the DES needs to be commissioned ?

Thanks for the help,