def storage_max_constraint_rule(backend_model, loc_tech, timestep):
    """
    Set maximum stored energy. Supply_plus & storage techs only.

    .. container:: scrolling-wrapper

        .. math::

            \\boldsymbol{storage}(loc::tech, timestep) \\leq
            storage_{cap}(loc::tech)

    """
    return backend_model.storage[loc_tech, timestep
        ] <= backend_model.storage_cap[loc_tech]
