4. A generating station has a maximum demand of 10 MW. Calculate the cost per unit generated from the following data: Annual load factor Capital cost = 35% = Rs 12,50,000 Annual cost of fuel and oil = Rs 8,00,000 Taxes, wages and salaries = Rs 7,00,000 Interest and depreciation = 10% 5. From the following data, estimate the cost per kWh for the generating station: Plant capacity Annual load factor Capital cost = 50 MW = 40% = Rs 12× 106 Annual cost of wages, taxes etc = Rs 4,00,000; cost of fuel, lubrication, maintenance = Rs 17,52,000; Annual interest and depreciation = 10% of initial value. [1-913 paise per kWh] 6. In a particular area both steam and hydro stations are equally possible. It has been estimated that capital costs and running costs of these two types will be as under: Plant Hydro Capital cost/kW Rs 3000 Running cost/kWh 3 paise 10 paise Interest 5% 5% Steam Rs 2000 If the expected average load factor is 40%, which is economical to operate, steam or hydro? [Hydro] 7. The energy cost of a 100 MW steam station working at 40% load factor comes out to be 12 paise/kWh of energy generated. What will be the cost of energy generated if the load factor is improved to 60%? The fuel cost of the power station due to increased generation increase the annual generation cost by 5%. [8-4 paise] 8. A load having a peak value of 50 MW and 45% load factor is to be supplied by a steam power station in conjunction with a hydro-power station, the latter supplying 60 million units of en- ergy per annum with a maximum output of 20 MW. (i) Capital cost (ii) Cost of fuel (iii) Maintenance charges (iv) Interest and depreciation Calculate the average cost of energy. Steam: Rs 2000 per kW installed Hydro: Rs 3000 per kW installed Coal Rs 150 per metric ton; consumption being 0-5 kg per unit generated Steam: 0-7 paise per unit Hydro: 0-5 paise per unit Steam: 10% per annum Hydro: 9% per annum [11-6 paise]