Although many energy companies are looking to transition away from oil and into more green energy, the demand for oil remains strong globally. Even with the industry's notorious boom and bust cycles, the steady demand for both traditional and renewable energy sources all but ensures a resilient long-term market.

For investors seeking reliable investment income, energy companies are a good choice because they tend have shareholder-friendly dividend policies. Here are three companies to consider adding to your portfolio before the next rally.

Devon Energy (NYSE: DVN) is an energy company specializing in oil and natural gas exploration. The company's stock hasn't performed the best this year, down over 11%, but a potential rise in oil prices could be the catalyst that its bottom line and stock price need.

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Source Fool.com