Knapp said all the details need to be worked out before the end of the year, so construction can start before federal energy credits begin stepping down at the end of 2019. Companies get tax credits for solar. Construction could begin by fall 2019 and be complete by 2020. Electricity generated by the farm would flow into the regional grid coordinated by PJM Interconnection, since there's no way to transmit directly. But Philadelphia would take market ownership of the electricity, which would be delivered to Peco territory. The energy would not be generated for residential or commercial use.