Modern world is running with the power of fossil fuel, a king of energy source are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. But this kind of fuel are limited and it will run out sooner of later. But with the increase of population the demand of fuel is going high. Scientists predict that our fossil fuel will run out within mid of the next century. So the necessity of alternative energy source become very important. Renewable energy can solve these problem. Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale such as sunlight, wind, rain, tides, waves and geothermal heat. Renewable energy can replace conventional fuel in four distinct areas: electricity generation, hot water/space heating, motor fuels, and rural (off-grid) energy services. Like many developed country, Bangladesh is also working with the technology that can produce renewable energy. The government has installed the biggest solar power plant on the rooftop of the Bangladesh Bureau of Statistics building in Dhaka. The plant with a 200 kwp (kilowatt peak) generation capacity, equivalent to lighting up 5,000 bulbs of 40 watts, will meet a significant portion of the building's demand for electricity.