Looking for passive income? Exchange-traded funds (ETFs) are a great choice. These vehicles can instantly diversify your money, minimizing volatility. And if you choose the right ETF, you could earn reliable cash income to last the rest of your life. So what's the best ETF for permanent passive income? It's an ETF I've had my eye on for decades.

Nothing is ever truly permanent. But if an income stream can be reliable for the rest of your life, that comes pretty close. If you want permanent passive income, look at utility stocks. Utility stocks are one of the best investments on the market today for generating reliable profits.

Utilities provide the basic resources necessary to run a modern economy -- things like water, electricity, and natural gas. These services tend to be recession-resistant. That is, during a recession, demand dips very little, if at all. Since 2010, for example, annual electricity demand in the U.S. has remained between 3,856 terawatt hours and 4,067 terawatt hours despite plenty of economic ups and downs.

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Source Fool.com