If a company's dividend yield is in the double digits it can mean one of two things. Crestwood Equity Partners (CEQP 0.30%) and Energy Transfer (ET 2.31%) are examples of this latter group. Energy Transfer currently offers investors an attractive 9% yield. This yield is several times higher than the 1.7% dividend yield offered by an S&P 500 Index fund. In other words, a $1,000 investment into Energy Transfer could produce $90 in passive income each year. However, this amount would only generate $17 in dividend income if it were invested in the S&P 500. This big-time payout is based on a more sustainable foundation. In the third quarter, enough cash was generated by the company to cover its distribution 1.93 times. It was able to generate $760 million in excess cash that it used to finance expansion projects and decrease its debt. The payout is based on solid financial records. This chart shows that Energy Transfer trades at approximately 8 times its enterprise value (EV), to EBITDA. Energy Transfer has been increasing its payouts due to the improvement in its financial position this year. Energy Transfer gave investors a 15% increase last quarter, and increased its payout by 70% in the past year. It did this as part of its strategy for returning its quarterly payout to $0.305 per unit. Energy Transfer must increase its distribution by 15%, with the current $0.265 unit price. Crestwood Equity Partners currently pays 9.7%. This one, like Energy Transfer's distribution is on a solid foundation. The MLP generated enough cash during the third quarter to cover its payout by nearly 1.9 times. This allowed it to finance its expansion plan with plenty of cash. It also gave it the ability to borrow money. Crestwood anticipates producing between $780 million to $800 million in adjusted EBITDA this fiscal year. It trades at a 9.4 EV-to EBITDA ratio, with its enterprise value at $6.6 billion. The company's huge payout will continue to be supported by a firm foundation in the coming year. Crestwood has completed a series of strategic transactions in 2022, allowing it to focus more on its core operations. It acquired several core basins and exited 2 non-core regions. These deals increased its scale and enabled it to generate significant and growing free cash flow through 2023 and beyond. This should allow the company to reach its longer-term conservative target of a 3.5x leverage ratio. Energy Transfer and Crestwood Equity are traded at very low valuations. Investors can expect huge yields because of this. These MLPs make it possible to get big-time payouts on a more sustainable basis. They use their excess cash flows to finance growth or reduce debt. Matthew DiLallo holds positions in Crestwood Equity Partners, and Energy Transfer. The Motley Fool does not hold any position in any of these stocks. The disclosure policy of the Motley Fool is available.