We are told by government, the media and eco-activists that our future energy needs (electricity) should come from "renewable energy", e.g. wind turbines or solar voltaic panels.
Firstly, wind originates from different sources of air masses and is therefore not renewable. The strength of wind is determined by the pressure gradient, which itself is determined by the difference between cold/cool air and hot/warm air. The bigger the temperature differential the stronger the wind speed, which occurs between low pressure and high-pressure systems. Within hot or cold high-pressure systems, the wind is light and often calm.
Solar voltaic is not renewable, photons from the sun cannot be renewed once the energy has been expended. But the sun doesn't shine all the time, water vapour (gas), rain/drizzle (liquid), ice/snow (solid), clouds, and dust, in the atmosphere can change the electromagnetic input. Frost, dew, rain, snow and dust particles can change photon activity at point of contact with photo voltaic panels. Most importantly, between sunset and sunrise there is no sunlight.
How much wind and how much sunshine do we get in the UK?