Does roof covering can generate electricity?

Since the man learned to make a house, there are few concepts which same till now, like having doors and windows in the home and at least four walls which are supported by a roof. Roof is basically a topmost part of any building which is responsible to provide a support and protects us from unsuitable weather conditions. 

Even roof is made to use as a store, to put things and household products. Today solar shingles are used to produce electricity, are acts as a part of roof cover. Even the solar system which tends to generate hot water and air are used becoming a part of roof covering. Thus, solar systems can be integrated with the roofs and serve the mankind like solar cooker which is used to cook food with the help of sunlight. There are companies like Calgary roofing companies which assist in providing you better roofing solutions. 
The shape of the roof can flat, sloped, arched or domed this is depends on the area where the building is built, like the area where there is scarcity of rain, people prefer to built flat roof, so that they can collect some rainwater. Flat roof also helps to clean out the stagnant water and through a proper drainage we can collect rain water in the tanks for future use.