In their Comments feature, the Institution of Engineering and Technology published this article in Engineering and Technology in December 2016. In this critique, I highlight the misleading use of language and units in describing renewable generation technologies.
Typical claims for a percentage of electricity mean nothing, as you cannot have a percentage of something that is not a measurable unit. Similarly, using energy and power as interchangeable words for the same thing is deliberately misleading. The oversimplification has spread within the professional institutions; bodies that ought to be challenging the errors made in the public domain.
Energy policy in the UK is far too complex a subject to be undertaken by those currently in control. This site attempts to explain the technical difficulties to those wishing to understand.