From a 2003 news article about TVA's Apalachia Dam upgrade:

The improvements at Apalachia are part of an $875 million program to upgrade 92 generating units at 26 of TVA’s 29 hydroelectric dams. Begun in 1992, the program is halfway to its goal. When completed in 2015, it will increase the life of the upgraded plants by 50 to 60 years and add about 700 megawatts to the TVA system.

This is what should be done to all federally owned hydropower plants.

What was the MW for installed TVA hydro before this program ? Any estimate on increased MWh ?

Thanks,

Alan