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Power generated from fossil fuels constitutes a major proportion from the fuel mix around the world. Rising demand for clean energy and push for its adoption by major countries across the globe is assured to change fuel mix by 2050. Coal and natural gas constitutes around 2/3 of all power produced in the world, by 2050 renewable sources like solar and wind are anticipated to share a big pie.

Intermittent attributes of power produced from solar and wind can be made more reliable and alleviated through adoption of storage capacities. Researchers around the globe are working animatedly on identification of storage technologies to make cleaner fuel available for optimal hours. Battery technology is at nascent stages of development, but lithium-ion is expected to be the default technology in the near future. Batteries now cost, on average, $156 per kilowatt hour, nearly 90% less than in 2010, and are expected to cost $100/kWh in 2023 which is likely to become more economical. Pumped storage hydropower is at some spaces working as storage where water is pumped from one reservoir to another at a higher elevation, using solar or wind power when demand/prices for electricity is low. Solar storage  is  poised to progress as reliable source of energy as abundant when we do not need it and scarce when we do.