I dont think this 4,000 MW thing is feasible for a geological structure like Nepal. There would certainly be a big reservior, what would be the loss if there is an earthquake. Nepal is in earthquake prone region. Many times small is beautiful. So, build a maximum of 1,000 never more than that. It will diversify the risk and also the funding uncertainty and time required to complete the proejct be will less.

Some people talk about mega project that are of national pride etc, but we need projects that are decentralized throughout the country. You may have heard the so called "surung marga" from kathmandu to Hetauda. After a big media publicity they have not been able to start the project. Their claim was that the cost of the project will be around 25 billion, but the govt officials claims it will not be less than 35 billion. Again there is funding uncertainty because it is too big. Interestingly, there is another highway being completed 'a fast track to terai'. Why need another from hetauda to kathmandu. Promoter of 'surung marga' claim that they will serve traffic coming from west of chitwan. If they spend 35 billion there will be heavy charge for using "surung marga", why pay a high toll when there is already "fast track to terai"? So instead of investing in kathmandu centered/focused mega project, govt should give a high incentive to invest in other part of the country.  35 billion is a big amount, you can build a whole new city.