def METHOD_NAME(pudl_out_ferc1, live_dbs):
    """Check that the fuel cost fraction and mmbtu fractions are similar."""
    if not live_dbs:
        pytest.skip("Data validation only works with a live PUDL DB.")
    fbp_ferc1 = pudl_out_ferc1.fbp_ferc1()
    for fuel in ["gas", "oil", "coal"]:
        fuel_cols = [f"{fuel}_fraction_mmbtu", f"{fuel}_fraction_cost"]
        fuel_corr = fbp_ferc1[fuel_cols].corr().iloc[0, 1]
        if fuel_corr < 0.8:
            raise ValueError(f"{fuel} cost v mmbtu corrcoef is below 0.9: {fuel_corr}")