Solar Panels

Solar panels;
A way out of power crisis

Azhar Bukhari

CAN sunny Pakistan deal with its crippling energy crisis?
In fact, Pakistan is an exceptionally sunny country. If 0.25% of Balochistan was covered with solar panels with an efficiency of 20%, enough electricity would be generated to cover all of Pakistani demand.
Photo-voltaic solar power panels are often used for local and distributed power generation capability, such as on rooftops of homes and buildings. It is generally on-grid but it can be off-grid for remote places. Unlike the solar panel's relying on photo-voltaic cells, solar thermal power is centrally generated from thousands of curved mirrors in the desert focusing sun's light on to water pipes to generate superheated steam which is then used to generate electricity.
Solar energy makes much sense for Pakistan for several reasons, firstly, 70% of the population lives in 50,000 villages that are very far away from the national grid, according to a report by the Solar Energy Research Center (SERC). Besides, the country's creaky and outdated electricity infrastructure loses over 30 percent of generated power in transit, more than seven times the losses of a well-run system, according to the Asian Development Bank and the World Bank; and a lack of spare high-voltage grid capacity limits the transmission of power from hydroelectric plants in the north to make up for shortfalls in the south. Connecting these villages to the national grid would be very costly, thus giving each house a solar panel would be cost efficient and would empower people both economically and socially.
Pakistan has reported practical examples of the use of solar energy as seen in some villages of Pakistan where each house has been provided with a solar panel that’s sufficient to run an electric fan and two energy saving bulbs. Prior to this arrangement, the whole village used to be plunged in darkness at night. In Narian Khorian, a village about 50 kilometers from Islamabad, 100 solar panels have been installed by a local firm, free of cost, to promote the use of solar energy. With these panels, the residents of 100 households are enjoying light and fan facilities. This would not have happened for decades as the supply of electricity from the national grid would be difficult and costly due to the mountainous terrain.
In addition to renewable energy from the sun, Pakistan is also fortunate to have something many other countries do not, which are high wind speeds near major centers. Near Islamabad, the wind speed is anywhere from 6.2 to 7.4 meters per second (between 13.8 and 16.5 miles per hour). Near Karachi, the range is between 6.2 and 6.9 (between 13.8 and 15.4 miles per hour). In addition to Karachi and Islamabad, there are other areas in Pakistan that receive a significant amount of wind.
In only the Balochistan and Sindh provinces, sufficient wind exists to power every coastal village in the country. There also exists a corridor between Gharo and Keti Bandar that alone could produce between 40,000 and 50,000 megawatts of electricity, about twice the current installed capacity in Pakistan, says Mirian Katz who has studied and written about alternative energy potential in South Asia.
In recent years, the government has completed several projects to demonstrate that wind energy is viable in the country. In Mirpur Sakro, 85 micro turbines have been installed to power 356 homes. In Kund Malir, 40 turbines have been installed, which power 111 homes. The Alternative Energy Development Board (AEDB) has also acquired 18,000 acres for the installation of more wind turbines.
The village of Ghulam Muhammad Goth, north of Karachi with population of 800, about 10 km from the national power grid, now receives power from a small windfarm consisting of 18 wind turbines each capable of generating 500 watts of electricity. Installed by the state-run Pakistan Council for Renewable Energy and Technologies (PCRET), the farm produces enough to power for each home to have two low-energy bulbs, a fan and, most importantly, a television set.
In addition to high wind speeds near major centers as well as the Gharo and Keti Bandar corridor, Pakistan is also very fortunate to have many rivers and lakes. Wind turbines that are situated in or near water enjoy an uninterrupted flow of wind, which virtually guarantees that power will be available all the time. Within towns and cities, wind speeds can often change quickly due to the presence of buildings and other structures, which can damage wind turbines. In addition, many people do not wish for turbines to be sited near cities because of noise, though these problems are often exaggerated. Wind turbines make less noise than an office and people comfortably carry on conversations while standing near them.
As Pakistan grapples with its crippling Energy Crisis, it is important for the country to take advantage of its precious natural resources such as the high winds and the bright sunshine, and bio-fuels as byproducts of its sizable sugar-making industry. Such a strategy will lead to lower costs of generation by reducing the need to import oil. It'll also help reduce carbon emissions, a major environmental concern.