Behind-the-meter / gas-fired power inputs for a US data-center market: Henry Hub spot, regional basis differential, and the delivered industrial + electric gas tariff ($/MMBtu), each with its own source label. Pass market=<slug> (e.g. "northern-virginia", "dallas", "phoenix"). ★ WITHDRAWN 2026-08-08: the gas-to-grid levelized cost ($/MWh across CCGT/peaker heat-rate scenarios) is NO LONGER RETURNED. Five surfaces published a $/MWh for the same market on the same day up to 5.5x apart because each chose the burner-tip price by a different rule, with no sanity gate — this endpoint served a physically impossible $6.73/MWh for Phoenix stamped data_basis: "live". The heat-rate arithmetic was correct; the input price selection was not. The $/MMBtu layers are sourced and still returned; `gas_to_grid_status` carries the reason. DO NOT quote a cached $/MWh figure, and do not derive one yourself from the $/MMBtu without saying that you did. Do NOT use for the electricity grid fuel mix (use get_grid_data).
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