The world's population is growing rapidly, and so is the demand for power. Is there enough energy for everyone? If we use a mixture of different types of energy, yes. But each type of energy has advantages and disadvantages. Nonrenewable energy sources, or 'fossil fuels', like oil, gas and coal, are ready made and easy to use, which is why we have been using them for many years. But fossil fuels take millions of years to form and we are using them up at a much faster rate than they can be made again. And fossil fuels are quickly running out. They also cause pollution which means that they are harmful to the environment and contribute to climate change.
We can help to stop our energy supply from running out by using renewable energy, like wind, wave and solar power (from the sun). That is why we are developing technology to make use of renewable energy sources. But the wind isn't always blowing and solar power is not available at night, so we also need to be able to switch to other energy sources to keep our electricity supply going. Luckily, the UK is the windiest country in Europe. That is why there is always wind energy being produced somewhere on the island.