The biogas plant set up by the Pali Hill Residents' Association (PHRA) is working so well, that even after utilising the electricity generated by it to power more than 70 streetlights, it has a surplus supply that is being given back to the power grid. The plant has become a role model for residential societies, which can also process their solid waste on their own Dilip Bhujbal, the technical expert who has been overseeing the project said that the plant generates around 12 units or kilowatts per hour and works for around six hours a day. "On a monthly basis, around 1,100 units are returned to the grid using a process called net metering. A device known as a synchronisation system allows excess power to be put back in the power grid, he said.

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