Energy is the capacity to do work. An object may have energy because it is moving or because of its position. Energy is defined as: “the ability to do work.” Energy is an important part of our daily lives. It can be transformed into another sort of energy but it cannot be created and it cannot be destroyed. Energy has always existed in one form or another.Most of our energy comes directly or indirectly from the sun.Electricity is a form of energy and the flow of electrons which was discovered over 100 years ago. Electricity is a basic part of nature and it is one of our most widely used forms of energy. We use electricity every day and it is part of our daily life, without electricity we cannot live. We all need electricity; it does a lot of work for us. We use it many times each day. It lights our homes, warms and cools our rooms, and helps us keep them clean. It runs our TVs, DVD players, video games and computers.How electricity is generated in UK.There are many power stations of all types in UK. About three-quarters of the electricity generated in the UK come from burning of fossil fuels such as coal and natural gas. A very small proportion is produced from oil 1% and 18% of the electricity comes from nuclear power. The diagram below shows you how coal is burned to generate electricity.