Providing power for biasing in a remote set up

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Joined Feb 25, 2014

I'm working on my senior project and I'm trying to implement an IoT enabled energy meter at a local substation. I'm currently using a bench power supply to bias my acquisition circuitry such as hall effect sensors, op amps etc. I am looking to replace this somehow by either designing a power supply or using a battery or may be some electronic circuitry. I'm not sure what is the best way to deal with this problem? Can anyone guide me what would be the best solution for providing these biasing voltages that I'm using i.e. +5 V & +-15 V?