Siemens – Why Wind Parks Are Worth It
Siemens has published a detailed ecological review of its wind turbines. The key question is how long it takes a wind farm to generate the volume of energy that it consumes during its lifetime, for example for manufacture, installation and disposal. As expected the calculations show that land-based wind farms pay off faster than their more powerful counterparts on the open sea.
Land-based wind farms are ahead when it comes to amortization, or in other words how long it takes a wind farm to produce the volume of energy that it consumes over its entire lifecycle. For an onshore facility, assuming an average wind speed of 8.5 meters per second, the amortization period is only 4.5 to 5.5 months. This figure also takes materials, production, construction, operation, maintenance, dismantling and recycling into account. Offshore wind farms, on the other hand, take a little longer – between 9.5 and 10.5 months – to offset their energy requirements.
[siemens.com] – Just how green is wind power?
Editor: onshore average wind speeds of 8.5 m/s are not very realistic, but assuming a payback time of 1 year, you still have a proud EROEI rate of 25, assuming a 25 year economic lifetime: