In this research project, the energy requirements of a waste water treatment plant were calculated and how big of a solar farm is required to completely neutralize the energy requirements of a WWTP. Because solar adoption at wastewater treatment plants is still relatively new, there is little known about these facilities, including where they are, what drove them to. In a groundbreaking move towards sustainability, Southern Water has successfully converted one of its wastewater treatment sites to operate entirely off-grid. Self-sufficiency: For some, it will make sense to provide as. Upgrade to an off-sewer, off-energy grid modular wastewater treatment. Augment an existing system, add redundancy to your infrastructure, or provide sanitation where needed with minimal operating expense.