From what I’ve read, no peak load capabilities even include wind power, because of inconsistent output.
As a matter of interest, Machine Design (an engineering trade pub) has run analyses showing that wind turbines may actually produce NO net power at all when the entire system is analyzed.
RE: wind power is inconsistent
Good point ... allow me to embellish
WSJ: One grievance (against wind power): Coal, nuclear and gas operators must pay for their own backup if an operational or maintenance problem prevents them from delivering power as promised. But if wind generators fail to deliver promised power because the wind doesn’t blow, the cost of backing up wind power companies is spread among all the generators, state officials say. This puts an unfair burden on nonwind generators, says the gas faction.
“My philosophy is that whoever causes the problem should be responsible for fixing the problem,” says Kevin Howell, president of Texas operations with NRG Energy Inc., the state’s second-largest power provider. “Wind shouldn’t cause problems that other people have to fix.”
http://online.wsj.com/article/SB10001424052748704188104575083982637451248.html
Net, net: Wind power is being built at the expense of coal power and natural gas power generation in Texas. Which is why Texas has rolling blackouts today.