Combined Heat and Power - CHP – sold as a way to deliver ‘free’ electricity while providing the core functions of space and domestic water heating, has an important role to play in the transition to de-carbonize our buildings. This technology first showed up in New England over 80 years ago, and has been progressively moving towards smaller applications suitable for multi-family housing. Many - maybe most - of these installations were incentivized by rate-payer funded energy efficiency programs. Under these programs, the system operation is measured and evaluated. Sounds good - so what is the issue? Load coordination. New Ecology has uncovered problems in how CHP, and their backup boiler systems, collaborate to satisfy a building's load. This problem goes unnoticed because no no-one collects the data that can tell this story. We do. We will share and interpret our data to illustrate what poor coordination looks like, what it costs in dollars and carbon, the reasons behind it, and how it can be improved.