Java Jive wrote:

wrote:

http://en.wikipedia.org/wiki/Windbelt

"Over a lifetime of 20 years, it is expected to produce 100-200 Wh, or
1 mW average.[5]"

Will that be sufficient to offset the energy used to construct it and
transport it to the site of use, added to the energy required to
dispose of it at end-of-life?

2p worth of mains electricity over 20 years, even with harry's fantasy
pricing of 50p/unit by the next decade, call it 10p worth.