Bungi Bill,
That still requires a stable grid - as do wind turbines.
Why would a network of wind; photovoltaic; concentrated solar power with molten salt or hot sand (They collect energy in the day and have enough during the night to still produce power.) - why would all of these not be able to provide a stable grid? The more varied sources you have, each complimenting the other, the more stability you get.
Also, you may ask the Chinese why they're ramping up their production of windmills by about 50% per year. They already have 3% of their total needs met by windmills. They are also extending their grid to power far off regions in their country.
Bottom line, it's working in other nations.