The S&P 500 has been scorching hot over the past year. The broad market index has rallied nearly 28%. That has it trading at an all-time high.

However, not all stocks participated in the rally. Energy stocks are up only about 1% over the past year, so the sector trades at a historically low valuation. That suggests energy stocks have significant upside potential during the next sector rotation.

The energy industry currently has a historically low weighting in the S&P 500:

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Source Fool.com