def fuel_burn_rule(mod, g, tmp):
    """
    Fuel burn is the product of the fuel burn slope and the power output. The
    project fuel burn is later multiplied by the fuel emissions intensity to get the
    total captured emissions, so fuel_burn_slope x emissions_intensity should equal
    the amount of emissions captured per unit of consumed power.
    """
    return (
        mod.fuel_burn_slope_mmbtu_per_mwh[g, mod.period[tmp], 0]
        * mod.DAC_Consume_Power_MW[g, tmp]
    )