Interface OutputEnergyCosts

interface OutputEnergyCosts {
    costs: {
        combined: MonthlyEnergyCost;
        electric: undefined | MonthlyEnergyCost;
        gas: undefined | MonthlyEnergyCost;
        oil: undefined | MonthlyEnergyCost;
        propane: undefined | MonthlyEnergyCost;
        wood: undefined | MonthlyEnergyCost;
    };
    per_consumer?: {
        combined?: FuelConsumerBreakdown;
        electric?: FuelConsumerBreakdown;
        gas?: FuelConsumerBreakdown;
        oil?: FuelConsumerBreakdown;
        propane?: FuelConsumerBreakdown;
        wood?: FuelConsumerBreakdown;
    };
    total: number;
}