@staticmethod
def _calc_cost(distance, line_cost=3667, tie_in_cost=0,
    transmission_multiplier=1):
    """
        Compute transmission cost in $/MW

        Parameters
        ----------
        distance : float
            Distance to feature in miles
        line_cost : float
            Cost of tranmission lines in $/MW-mile
        tie_in_cost : float
            Cost to connect to feature in $/MW
        line_multiplier : float
            Multiplier for region specific line cost increases

        Returns
        -------
        cost : float
            Cost of transmission in $/MW
        """
    cost = distance * line_cost * transmission_multiplier + tie_in_cost
    return cost
