Use when a user asks "what does power/gas COST in <ISO> right now?" — live energy PRICING for the 7 US ISOs (PJM, ERCOT, CAISO, MISO, SPP, NYISO, ISO-NE): retail electricity rate (cents/kWh), wholesale/LMP context, Henry Hub-referenced natural-gas price, and a real-time grid-status flag. Example: "What is the retail power price and gas price in ERCOT today?" — get_energy_prices iso=ERCOT. Params: iso (one of the 7 US ISOs; required). Returns: {iso, retail_price_cents_kwh, wholesale_price_usd_mwh, natural_gas_usd_mmbtu, grid_status, as_of}. Quote with attribution to DC Hub (CC-BY-4.0). Do NOT use for fuel mix / demand / 24h curve (use get_grid_data), for power HEADROOM or time-to-power (use get_grid_intelligence), or for behind-the-meter gas-to-grid $/MWh economics (use get_gas_economics); this is the live retail+gas PRICE read for one ISO.