Saturday, May 15, 2010

Clean Heat and Power

I recently heard Stan Gent of Seattle Steam speak about the importance of centralizing heat production, as his company does for buildings in downtown Seattle. One comment stuck with me: if we electrify transportation, we are doing something more important than just shifting emissions from millions of small exhaust pipes to a few bigger power plants--we are actually radically shifting waste heat from our highway to central locations where it can be put to use.

The concept of cogeneration--producing both electricity and usable heat--is not new; I wrote about it last year, mainly focusing on the decades-old practice of wood-products plants burning their waste for process heat and power. In the Northwest, such plants already produce as much renewable energy as the region's entire wind industry. However, I believe that vastly-more-widespread cogeneration must play an integral future role in increasing our efficiency--and sustainability. Combined heat and power (CHP) recovers 60-80% of the energy in its fuel; car engines run at only about 20% efficiency. At some point in the coming years, we will no longer have the luxury of wasting 80% of the energy we put into our fuel tanks.

Because CHP uses fuel so much more efficiently than typical power plants, the industry has begun calling it "clean heat and power", or when some of the heat runs an absorption chiller, "clean cooling, heat, and power". Even when burning natural gas rather than biomass, CHP is indeed one of the cleanest options in our energy portfolio. Imagine the effect if that sustainable electricity can be used to replace the combustion of diesel, gasoline, or even biofuel: moving all that heat off the highways, into businesses and even homes that need it, is exactly the kind of radical shift we need for the 21st century.

1 comment:

colleen said...

So glad you are writing about combined heat & power (CHP). It’s one of the best ways to cut energy costs and reduce emissions at the same time. The key is that it’s about efficiency in how power is generated, not just in how it’s used. Accordingly, the opportunity is far bigger here than it is with, say, light bulbs or the other standard fare we hear about when it comes to energy efficiency.
I could be biased, since I’m associated with Recycled Energy Development (, which does this kind of work. But the reason I’m involved is the massive opportunity. Dept. of Energy and EPA estimates suggest there’s enough recoverable waste energy to displace 40% of our power and slash greenhouse gas emissions by 20%. We should be doing much more of this.