Winter Energy Mix Optimization (Heating + Production)

For a Lanzhou plant with steam heating and electric drives, design a winter (Nov–Mar) energy mix plan. Return a step-by-step calculator: Inputs (tariffs by hour, boiler efficiency, steam demand, COP if using heat pumps), Calculations (cost per GJ and per unit), Outputs (daily/weekly cost, CO₂-intensity estimate). Add a weekend/holiday schedule and a peak-shaving idea using thermal storage.