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This is quite an interesting problem and given lack of budget, options is limited.
The end game should be better provisioning from the grid, that will take big funding and a lot of resources.
To reach the best solution, it is important to assess needs and the status of the power supply as it stands now. The assessment should look at what the essential needs are and then try to fulfil the top priorities.
Hydro systems have limited use. When water dries up, then there is no means to generate power. Bio fuel or diesel will depend on secure supplies on an ongoing basis. I personally do not feel that the implementation of many generators in each house will be the best solution. Centrally generated power in lager power stations is usually the most cost effective.
The best way to approach this is to work out what the consumption needs are for each building. Lighting and perhaps communications should have some sort of priority. Given that power does exist occasionally, the best solution is to have a charger/inverter arrangement to store power. This may be supplemented by solar and perhaps wind systems.
I can provide more specific ideas if I am given some more detailed information regarding the actual needs.