Energy efficiency in industry and the role of technology

Learn more: www.energyefficiencymovement....
Since the beginnings of the Industrial Revolution, improvements in energy efficiency have had a huge impact on the world we live in. In this video interview, Professor Jero Ahola, LUT University in Finland, talks to Panu Virolainen, CTO, Motion Business Area, ABB about the past, present and future of energy efficiency.

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The main issues are;
Solar energy is a free and penny less source of energy, right?
But , every manufacturer of solar panel on their products brochures say 25%, 27% 29% efficiencies,
My question is, where are the remaining 75% etc goes?????