Big dividends can be intoxicating, but you need to understand what's backing the quarterly payments. You may end up surprised by a dividend reduction if you don't.

That's why long-term income investors will find Enbridge (NYSE: ENB) and Hannon Armstrong Sustainable Infrastructure (NYSE: HASI) attractive, but will want to tread cautiously with ConocoPhillips (NYSE: COP). Here's what you need to know about each.

Canadian midstream company Enbridge has increased its dividend annually for 27 consecutive years. Its yield at the current share price is around 6.4%. Its portfolio of vital energy infrastructure assets, which help move oil and natural gas around the world, spans North America.

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Source Fool.com