I'm sorry, stupid question, but exacly how much power do those big ones generate? 20 times more than what? This actually most crucial tidbit isn't even covered in that article, or am I blind?
5 megawatts is a pretty useless figure for most people to imagine, and I think imagining it in units of homes-powered isn't great either because we don't have a sense of the heat or kinetic energy equivalent because our homes are quiet machines. A 260 horsepower car (think new minivan) at full throttle is producing about .2 megawatts, so the worlds largest turbines are generating the same power as 10/.2=20 minivans at full power.
Another way to think of it is in terms of heat. A big stovetop burner will generate about 3000 watts of heat, so a minivan is like 65 burners at full blast, and a 10 megawatt turbine is like 3300 burners.
The Stockton Cogeneration Facility near San Fran had a nominal output of 60MW. Thus, around twelve of these mega-windmills would roughly equal the output of that coal plant.
GE just announced a 12MW turbine, which will start appearing in real world projects in 2020.
As someone else said GE has a 12MW in development, and I swear I've heard announcements about 10MW and 11MW prototypes.