Niche ETFs that focus on solar energy companies soared Tuesday after top holding First Solar (NasdaqGS: FSLR) released 2013 guidance that topped Wall Street forecasts.

First Solar shares spiked nearly 50% in afternoon trading.

The stock represents 14.6% of Guggenheim Solar ETF (NYSEArca: TAN) and 9.6% of Market Vectors Solar Energy (NYSEArca: KWT).

First Solar said it expects full-year earnings between $4 and $4.50 a share, excluding up to $10 million in restructuring expense. Analysts polled by Thomson Reuters are looking for EPS of $3.51 a share, on average.

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