EDITORIAL (August 18 2008): According to a report in this newspaper, the Pakistan Sugar Mills Association (PSMA) is lobbying for an upfront tariff of 11 cents per unit instead of the existing indicative tariff of 7.8 cents for the co-generation projects it has offered to set up to bridge the power supply-demand gap in the country.
Nepra has however termed the tariff demanded by PSMA as too high. The Minister for Water and Power, Raja Pervaiz Ashraf, has assured PSMA that the government will provide maximum possible incentives, and resolve all pending issues relating to the planned power projects. The minister has also directed the PPIB Managing Director to process the proposals submitted by the sugar industry on a fast-track basis.
According to one estimate, the country's 77 sugar mills are producing 12 tonnes of baggase - a by-product - that can co-generate over 2,000 megawatts of additional electricity. It is said that the sugar industry can initially generate 1,000 megawatts of electricity within two years, which, incidentally, is rather a longish period, given the rapid rate of growth of power demand in the country.
The existing power supply-demand gap ranges from 4,000 to 5,000 megawatts while the country's total installed generation capacity from hydroelectric, thermal, IPPs and nuclear sources stands at 19,566 megawatts, which is almost two-thirds of the entire generation capacity. Power consumption in the country has meanwhile grown at an average rate of 9.5 percent per annum over the last four years.
A stagnant power supply but growing demand has created a deficit of 4,000 to 5,000 megawatt, while the demand for electricity is projected to grow at the rate of 8.7 percent per annum. Bagasse therefor offers an inexpensive and efficient way to generate electricity.
Experts believe that with a little improvement in technology, or by entering into joint ventures with Wapda, the sugar industry can acquire the high-pressure technology to increase its power co-generation capacity. According to one estimate, a sugar mill with a capacity of 4,000 TCD can produce around 40 megawatts of electricity from bagasse.
The country can thus benefit with the overall production of 3,000 to 4,000 megawatts of electricity, and Wapda can recover the invested amount within two years. Secondly, co-generation methodology can be pressed into service during the lean period ie from October to March when hydropower plants are at their lowest ebb due to shortage of water while the crushing season is in full swing.
By using this new technology based on high pressure, power boilers attached to extraction-condensing turbines can operate and produce electricity to fill the widening gap between power supply and its rising demand. Thirdly, the process is environment friendly as no greenhouse effect or ozone depletion takes place due to use of bagasse as fuel.
Fourthly, this mode of power generation would be based on a local raw material, as a result of which the electricity produced will be cheaper than that produced by IPPs by at least 20 to 30 percent. The methodology involves use of a power station to simultaneously generate both electricity and usable heat energy. Conventional power plants emit heat created as a by-product of electricity generation into the environment, while co-generation offers a simple way of increasing the overall efficiency of a power plant by utilising the waste heat in the exhaust gases rather than discharging them into the atmosphere while still warm.
Thus, fuel is used at a very high efficiency level, and the overall emissions of carbon dioxide are minimised. Experts maintain that in order to obtain heat at a useful temperature, it is normally necessary to raise the temperature of the exhaust gases, which in turn increases the overall efficiency. Thus, the overall efficiency for CHP ranges from 70 to 90 percent as compared to 35-55 percent for conventional power plants, which is a major plus point.
Use of co-generation is particularly appropriate in factories or on farms that operate drying processes. Yet another benefit is that co-generation plants are small as compared to conventional power stations, and are often sized to suit an industrial or commercial application that requires a fairly constant quantity of electricity and heat for its operations.
Although power tariff demanded by PSMA for co-generation projects is indeed on the higher side, the cost of power production is steadily increasing whether it is co-generation or conventional power generation. There is thus a need to rationalise power tariff for co-generation and other modes of electricity production.
However, a tariff of 11 cents per unit for all sugar mills will be rather too high in our socio-economic environment. As sugar industry will be using a cheap local raw material for power generation, the rate of tariff demanded by it needs to be negotiated.