Investing in high-yield dividend stocks has become an attractive option for many investors looking to generate a steady income from their idle cash. Among the top picks in this category are pipeline giants Enbridge and Enterprise Products Partners, which offer both impressive track records and significant upside potential. Now could be an opportune time to consider these stocks, particularly for those with a smaller investment budget.

Enbridge, a Canadian pipeline and utility operator, stands out with its forward dividend yield approaching 7.5%. This implies that investors can earn nearly $7.50 of annual dividend income for every $100 invested in the company. Despite U.S. investors being subject to a 15% withholding tax, Enbridge presents a sustainable and attractive dividend option given its robust cash flow generation and strong balance sheet.

The company boasts a highly sustainable dividend supported by its cash flow, with a significant portion (98%) coming from stable cost-of-service agreements or long-term contracts. Enbridge pays out 60% to 70% of its steady income in dividends while retaining the remainder to fund expansion projects. Its healthy leverage ratio and ample financial flexibility further enhance its growth prospects.

Enbridge's current backlog of expansion projects, primarily focused on lower-carbon energy infrastructure such as gas pipelines and renewable energy projects, is set to fuel its cash flow growth per share at a rate of around 3% annually through 2026. Following that, Enbridge anticipates an acceleration to a 5% annual growth rate. This positive outlook positions the company to continue increasing its dividend, an impressive streak that spans 29 consecutive years, including a more than 3% increase last year.

Enterprise Products Partners, a master limited partnership (MLP), offers an even higher forward yield of over 7%. While MLPs can involve some tax complications related to their Schedule K-1 tax forms, Enterprise Products Partners' sustainable and growing distribution payments make it a compelling choice for passive income seekers.

Similar to Enbridge, Enterprise Products Partners generates stable cash flow predominantly from assets backed by long-term contracts and regulated rate structures. The MLP's cash flow comfortably covers its high-yielding payout with a 1.7 times coverage ratio. It maintains a strong balance sheet and credit rating, providing it with ample financial flexibility to continue its expansion plans.

The company has several billion dollars' worth of expansion projects currently under construction, expected to be operational by the first half of 2026. Additionally, Enterprise Products Partners is actively developing other projects, including an offshore oil export facility, which could further contribute to its growth. With a solid financial profile and visible growth prospects, the company is well-positioned to sustain its upward trajectory in high-yielding distribution payments.

Enbridge and Enterprise Products Partners have demonstrated exceptional track records in increasing their dividend payments over the years. As both companies continue to grow, their stocks present promising opportunities for investors seeking to turn idle cash into a lucrative and steadily growing income stream.

Please note that before making any investment decisions, it is crucial to conduct thorough research and consult with a financial advisor to align your investment choices with your financial goals and risk tolerance.