The non-renewable energy is energy from fossil fuels such as coal, crude oil, natural gas and uranium. Unlike renewable energy, non renewable energy need human intervention to make it suitable for consumption. Fossil fuels are mainly made up of Carbon. Non-Renewable Energy. Non-renewable energy sources diminish over time, and are not able to replenish themselves. In other words, they are finite, and once they are used, they are effectively gone because they take so long to reform. You have already read about the four non-renewable energy sources: coal, oil, natural gas, and nuclear.