The article discusses using waste heat from power plants to heat municipal water supplies, which can save energy and money. By directly releasing hot water into the system, it can improve power plant efficiency and reduce the need for water heaters. However, there are some drawbacks, like needing more pumping power and extra chlorine in the water. A study on Chicago's water supply and power plants showed potential energy savings equivalent to 4 million barrels of oil and cost savings for the population. Real-life examples show this method can work, but each location needs its own analysis to see if it's feasible.