I'm always reading something about them trying to figure out how to use waste heat. This isn't all tree hugger stuff, it's often about improving efficiency to cut costs. It also has environmental benefits and conserves limited energy resources, so it's win win all around. That certainly isn't always the case if it's some ridiculous government mandated program though.
Oh, I agree. The minimizing of waste heat energy is a major topic in stationary engineering. Physical plants that generate steam, for example, are optimized to minimize waste. The people who own physical plants, power plants, etc, certainly have always had a strong interest is reducing fuel costs.
How about this, then: A bank of Stirling heat engines using the waste heat. Actually, I'm not sure if 80 C is enough to run one of those, either.