Factories aren't in the business of generating electricity. They were already willing to throw that heat away normally, why take a bunch of capital that you cou

Factories aren't in the business of generating electricity. They were already willing to throw that heat away normally, why take a bunch of capital that you could invest in the business and use it to buy equipment unrelated to your business when someone else will install and manage the waste-heat system for you and give you a 10% cut for no risk and no outlay on your end?