on the contray, it’s otherway around. west will not offer those plants on EASY terms. (in simple words, hum tu tayar baithai hain, koi dukaan tou khoLai.. 
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The current shortage is about 5 GIGA WATTS PLUS 30% line loses (our total capacity is around 19 gig, so you can see that just by overcoming line losses we can save around 5.5 gigs) . Also keep GREENER energy factor in mind (as the suppliers are very reluctant to provide dual use/unsafe technology to 3rd world countries)
Nuclear energy is the only feasible & long term way out of Pakistan’s energy problem. Under these circumstances only China is a dependable source, but irony is that setting new nuclear plants is a time consuming business and even if we start now it will take upto 5 years to setup a decent nuclear power generation plant. In the mean time Pakistan should concentrate on gas/coal energy (as Ravage mentioned). Iran can be the natural supplier for our gas needs, but there is too much politics involved. What government can do NOW is to encourage private sector to invest in energy sector, they can do it by giving rebate in taxes if Industrial units are generating their own energy.
Going to smaller dams option would just not be enough.