Business Green: In a groundbreaking move for the embryonic thin film solar sector, leading US manufacturer First Solar has signalled its intention to crack the residential market announcing a $25m (£15m) investment in solar panel installation firm SolarCity. Under the terms of the deal, which forms part of a $30m funding round for SolarCity, First Solar will provide 100MW of solar modules to the company over the next five years, with the first batch being delivered early next year. The move is …