A hotter-than-usual spring and summer are putting India’s nascent renewable energy sector to the test. In Karnataka, the Indian state that produces the most renewable energy, temperatures have been around three to four degrees Celsius higher than the average for the season, and that average is already blisteringly hot at 36-40º Celsius (97-104º Fahrenheit). As a result, Karnataka recently recorded its highest daily energy demand ever as residents crank up their air conditioning, at 309 million units. While the punishingly…