So Warren Buffett has the hots for solar. This week he committed a further $2.5-billion (U.S.) to the industry through his MidAmerican Energy Holdings. For the first time in a long time, he is not alone. Shares in solar-panel makers such as First Solar and SunTech have finally turned a corner, recovering in recent months from five-year lows. Never mind the fundamentals – SunTech, the world’s biggest panel manufacturer, carries $1.6-billion in net debt and is loss-making, for example.