Grid load for five US data center hub zones, built from EIA-930 hourly demand and delivered as daily or monthly series. Hubs: DOM (Dominion Virginia Power zone, PJM), NCEN (North Central, ERCOT), CE (Commonwealth Edison zone, PJM), PGAE (Pacific Gas and Electric, CAISO), ZONJ (New York City, NYISO). Daily rows: date, average MW, overnight floor MW (the day's minimum hour), zone hours, matched hours, status, and share of the parent grid. Monthly rows: average MW, overnight floor MW, share of parent, trailing 12-month average and overnight floor with their growth on the trailing 12 months a year earlier, and the count of complete days each figure used. Basis: EIA-930 hourly demand; UTC calendar days and months; days with fewer than 20 reported zone hours excluded; revisions not applied to the zone series. Signal tier.