Tesla boss Elon Musk unveils solar roof tiles

Musk showcases new energy products to illustrate benefits of merging his firm with solar installer SolarCityThe Tesla chief executive, Elon Musk, has unveiled new energy products aimed at illustrating the benefits of combining his firm, which makes electric cars and batteries, with solar installer SolarCity. The billionaire entrepreneur showed off solar roof tiles that eliminate the need for traditional panels and a longer-lasting home battery, which Tesla calls the Powerwall, aimed at realising