Quartz: The price of solar power in India fell at a faster-than-expected rate this year. Now, some experts suggest that by 2020, renewable energy in Asia`s third-largest economy may become up to 10% cheaper than coal power. Earlier this month, the Ministry of New and Renewable Energy awarded a tender for a 500-megawatt solar park in the southern state of Andhra Pradesh to US-based SunEdison at Rs4.63 a unit--the lowest rate so far in the country. "Today, in India, solar prices are within 15% of the coal...