Sunny days ahead for solar power

Solar power is a clean energy source. But in the arid part of northwest India it can also be a dusty one. Every five days or so, in a marriage of low and high tech, field hands with long-handled dust mops wipe down each of the 36,000 solar panels at a 63-acre installation operated by Azure Power. The site is one of the biggest examples of India's ambitious plan to use solar energy to help modernise its notoriously underpowered national electricity grid and reduce its dependence on coal-fired power plants.

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