Its top picks are three Chinese companies: ReneSola ( SOL), a maker of the crystalline raw material used to make solar wafers, at 5.2% of the fund; LDK Solar ( LDK), the world's largest manufacturer of solar wafers, at 5.2%; and JA Solar Holdings ( JASO), at 4.8%. ReneSola is the star of the group, with its shares up 18% this year after a gain of 84% in 2010. As could be expected for a fund that is so focused, Guinness Atkinson Alternative Energy's returns are volatile. Last year, it lost 21% of its value. Also off to a quick start this year is the $1.2 billion Fidelity Select Electronics Fund ( FSELX), up 6.7%. Its biggest holding, at 9.9% of the fund, is Marvell Technology ( MRVL), up 6.7% this year. A top performer is its fourth-largest holding, at 4.9%, Micron Technology ( MU), up 24%. But the hottest stock in the fund is a maker of graphics-processor chips, Nvidia ( NVDA), up 56%. Fidelity Select Electronics gained 17% in 2010 and 85% the year before. Its performance can be volatile since the portfolio typically has a big allocation to semiconductor stocks.