Pump as Turbine to feed electrical pumps
Take advantage of the rivers in Bihar to provide micro hydro power generation

Solution

Use standard centrifugal pump as turbine to generate electricity to a group of farms. Low cost of this kind of installation could be shared between a group of farms. These farms could use the generated electricity to feed their electrical pumps. Standard pumps are easier to service than "real" turbines and the installation are simple and quick.