def min_power_rule(mod, g, tmp):
    """
    **Constraint Name**: GenCommitCap_Min_Power_Constraint
    **Enforced Over**: GEN_COMMIT_CAP_OPR_TMPS

    Power minus downward services cannot be below a minimum stable level.
    """
    return mod.GenCommitCap_Provide_Power_MW[g, tmp] \
        - mod.GenCommitCap_Downwards_Reserves_MW[g, tmp] \
        >= mod.Commit_Capacity_MW[g, tmp] \
        * mod.gen_commit_cap_min_stable_level_fraction[g]