Proven Energy has announced that it has a problem with one of its popular small wind turbines:
Proven Energy has become aware of a potential manufacturing defect in its Proven 35-2 wind turbine (The Proven 7 and Proven 11 are unaffected). We are investigating this, however, our work to date has now shown that a significant number of shafts may be affected across multiple manufacturing batches.
With that in mind we are now advising all Proven 35-2 owners to place their wind turbines on brake as soon as it is safe to do so. Under no circumstances should you apply the parking brake whilst the wind turbine is rotating at normal operating speeds since this will place extra stress on the shaft. We will ensure that you receive regular updates in the interim period. Please accept our apologies for any inconvenience caused.
In other words, that propeller whirling above your farmhouse is in danger of breaking off and turning you into a puree. Oh yes, but you can't switch it off until the wind stops blowing. Round where I live that could be six months or so!
Clearly in green circles, "Proven" means something slightly different to normal usage.
(H/T John Lyon)