Non-renewable energy sources
Thermal and electrical energy are the most dominant forms of energy which enable the functioning of modern civilization. Using advanced technological processes by applying certain converter these types of energy can be converted into other forms of energy. It is important to state that heat and electricity are today dominantly derived from non-renewable sources of energy.
Under the term of non-renewable energy sources one considers all potential carriers of some form of energy that were once created, but cannot be restored at the moment. Such energy sources are fossil fuels (oil with its derivate, coal, natural gas) and nuclear fuels (fission).
