Wind farms power questions

I was driving out I-10 near Indio, CA looking the huge Wind Powered generators ( Wind Farms) returning from AZ yesterday and started wondering just how much electricity these things produce.. and at what cost. In N. California we have them in the Altamont Pass. But many are in disrepair. If I remember correctly they were a tax strategy more than a power producer in the 80's and 90's .. Many designs. Some pretty cool looking... I would like to go off the grid someday and wave goodbye to PG&E. Many of my friends use Solar and Hydro now in N. California. On the northern coast there is always a steady flow of air coming off the Pacific Ocean. Has anyone the numbers on these things ( costs, power generated , etc.) and care to share the info.