[thackney]

I heard that Texas has not allowed electric stations to be built for about 15 years.

You heard wrong. Get a better source of information.

1990 - 2009 Existing Nameplate and Net Summer Capacity by Energy Source, Producer Type and State
http://www.eia.doe.gov/cneaf/electricity/epa/existing_capacity_state.xls

Texas
1995 Total Electric Capacity 77,469 MegaWatts
2000 Total Electric Capacity 86,948 MegaWatts
2005 Total Electric Capacity 109,956 MegaWatts
2009 Total Electric Capacity 111,848 MegaWatts

[meyer]

Keep in mind that not all of Texas is in ERCOT. Parts is in the eastern interconnection, and part (including El Paso) is in the Western interconnection. So in the earlier post where ERCOT generating capacity was quoted, that did NOT include these areas.

[deport]

ERCOT numbers show about 75,000 MW of generation availiable.
http://www.ercot.com/content/news/presentations/2010/ERCOT-2010-Capacity-Demand-and-Reserves-Report-Winter-Update.pdf