How can the wind speed for the site be estimated?

As noted above, the only way this can be properly done is by the prolonged use of wind logging equipment. Shorter term logging, using temporary wind loggers, can provide some useful information, however most site appraisals start by the use of the NOABL wind speed database. The NOABL database models wind speed for every square km of the UK. It can be accessed at: www.bwea.org . NB: It is important to note that the NOABL data will only provide an initial estimate for a 1km square. Topological features such as terrain, trees and buildings will very significantly affect wind strength at a given site.