Who needs solar power when you've got onions?

Forget about composting: A California farm is transforming "onion waste" into electricity


Andrew Leonard
July 18, 2009 12:50AM (UTC)

Who doesn't love an onion power story?

Until today, Gills Onions, a southern Californian farming giant that boasts "the largest fresh onion processing plant in the world," produced about 300,000 pounds of "onion waste" a day.

But no longer. On Friday the company unveiled a clever scheme to convert onion byproducts into electricity.

Advertisement:

From CNET's Martin Lamonica:

One of the main components of the system is an anaerobic digester that converts treated onion plant waste into biogas. That gas is then conditioned and turned into methane, the main component of natural gas. Then the natural gas is fed into a 600-kilowatt fuel cell from Fuel Cell Energy to make electricity.

Gills Onions estimates that the $9.5 million project will have a six-year investment pay back. Among the financial benefits are reducing its electricity bill by $700,000 a year and $400,000 annual savings from handling onion wastes, which used to be spread on their land. The project also received $499,000 from a state waste-to-energy research program

All this would seem to be enough to make a waste-not/want-not enthusiast cry onion-induced tears of joy.

But what I always wonder with these "farm-waste-to-gas" stories is why we would be considering left-over vegetable matter "waste" to begin with. There's no vegetable waste in my kitchen -- it all goes into the compost bin and ends up refreshing my garden. I would presume that a farm as big as Gills could recycle plant waste back into the land, as well.

Whenever we turn plant products into power, we're removing nutrients from the ecosystem -- forever. How sustainable is that, in the long run?


Andrew Leonard

Andrew Leonard is a staff writer at Salon. On Twitter, @koxinga21.

MORE FROM Andrew LeonardFOLLOW koxinga21LIKE Andrew Leonard

Related Topics ------------------------------------------

How The World Works

BROWSE SALON.COM
COMPLETELY AD FREE,
FOR THE NEXT HOUR

Read Now, Pay Later - no upfront
registration for 1-Hour Access

Click Here
7-Day Access and Monthly
Subscriptions also available
No tracking or personal data collection
beyond name and email address

•••





Fearless journalism
in your inbox every day

Sign up for our free newsletter

• • •