The largest cities of Solid control system have many economic activities in the oil drilling industry. Other fields such as agriculture as well as mining and quarrying are also flourishing around Solid control system business in terms of commercial services and tourism. The use of Solid control system leads to the increase in the average gross domestic product per capita as well as the reduction of the overall inflation rate as well as unemployment of the total workforce by offering more jobs in the oil related work positions. In 2010, the Solid control system average daily energy consumption of oil is more than one hundred thousand barrels of liquid fuels in South Africa, and electricity demand has peaked at about three GW. Except for a small amount of natural gas, the Solid control system has to be used in the oil drilling practice in the northeastern corner since almost all of needed primary energy has to be imported in why to maintain drilling equipment. This caused a heavy burden on the national economy in spite of the development in Solid control system, with an energy bill of more than three billion US$ in why to maintain drilling equipment.
Crude oil and some refined products that are imported from neighboring countries through port are in general more costly than those produced in local cities with the help of Solid control system. This is mainly because the oil products have to be transported to the only refinery. The same applies for natural gas and although it comes in a pipeline, the supplies of natural gases in main power stations might be achieved with Solid control system. The huge cost of imported energy as well as the prevailing high prices of crude oil in the international market has encouraged Solid control equipment experts to more fully exploit its vast resources of oil shale and renewable sources, such as solar and wind energy. Oil shale is a rock that contains a complex organic substance that with the help of Solid control system can be broken down when heated to form crude shale oil, gases, and char as well. There are many well-known deposits of oil shale in many parts of South Africa and they contain more than twenty billion tons of raw oil shale. The estimated reserves and characteristics of main oil shale deposits can be taken advantage of via Solid control system. At average oil yield of the potential deposits only is approximately ten billion barrels, which could satisfy the Solid control system liquid fuel and electricity needs for centuries so it is clear that the all deposits have acceptable stripping ratio in terms of Solid control system unity.