If they last 25 years though. In the California hills and valleys which was postulated as the perfect place for them, they gave up trying to repair them many years ago.
It's worth noting that the wind turbines put up in California during the 1980's wind rush were constructed to take advantage of tax breaks and subsidies, and were typically very small scale in the 60 to 100KWh range.
Whilst it's true that many were abandoned once the subsidies dried up, it's also true that they are being replaced with modern megawatt class turbines, where a single new turbine can replace 10 to 15 of the old ones - the Altamont Pass wind farm being an example. But at 576 MW it's hardly a big operation compared to the UK where for example Hornsea 2 off the Yorkshire coast is 1320MW and Hornsea 1 is 1200 MW
