Get real-time electricity grid data for US ISOs and international grids.
Includes fuel mix breakdown, carbon intensity, wholesale pricing,
renewable percentage, and demand forecasts.
Args:
iso: Grid operator (ERCOT, PJM, CAISO, MISO, SPP, NYISO, ISONE, AEMO, ENTSOE)
metric: Data type (fuel_mix, carbon_intensity, price_per_mwh, renewable_pct, demand_forecast)
period: Time resolution (realtime, hourly, daily, monthly)
Returns:
JSON with grid metrics for the specified ISO and time period.
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