PJM has added more granularity for the Mid-Atlantic area in its load forecasting file. The Mid-Atlantic area is now represented with zonal forecasts for PSE&G (e.g. PSE&G/MIDATL), PECO, PPL, UGI, BG&E, JCP&L, METED, PENELEC, PEPCO, AE, DP&L, and RECO.

The zonal forecasts are apportioned based on the zonal percentage of Mid-Atlantic load in that hour on a similar day (temperature and load) or the prior day’s loads.