With the 10-year Treasury rate now at 4.5%, investors should demand more from their income stock investments. After all, if a company offers little growth and a much lower yield than the risk-free rate, then the risk might not be worth taking.

Midstream companies Enbridge (NYSE: ENB) and Kinder Morgan (NYSE: KMI) yield 7.7% and 6.8%, respectively, while Diamondback Energy (NASDAQ: FANG) offers investors a low ordinary dividend yield but plenty of upside from a variable dividend and high oil and gas prices. Here's why three fool.com contributors believe these energy stocks are worth buying now. 

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Source Fool.com