You said in 2012 you saw electricity generation was 6.4 Gw while requirement was 14Gw, see the link I posted electricity generation was more than 6.4 Gw. Then you said in 2014 growth increased to 14 Gw and demand to 20Gw. Demand ki toh samaj aa jate hai leikin ye production aik dam kese 14Gw par chale ge, ye is liye kyun ke ye pehle he more than 10Gw thee in 2012. To start any big power project it takes more than two-three years and for hydel double it.
Capabilities are around 20+Gw, even in musharaf's time they were, but Hyderal is dependent upon water supply, and they never generate 100% and Pakistani Dams like Terbella and Mangla, they are monsters. I remember in 2010 flood, till end they were only storing, and couldn't fill it up. IPPs always stuck with circular debit and oil pricing issues so They are main culprit loadshadding in Pakistan. so that is the reason, PPP government couldn't pay to IPPs at all, while NS paid them but not complete.