When entering a utility green power or REC contract into Portfolio Manager, you will be asked to select the renewable energy type and the location of the generator. This detailed information enables the most accurate calculation of avoided emissions. However, EPA recognizes that the exact details of some green power supply contracts are not known until the contract is delivered in full. For this reason, there is an option to select that the location is “unknown”. Making this selection will result in a conservative estimate of the avoided emissions. To enter your resource mix, you may confer with your green power supplier to enter the best approximation of energy sources for blended products.