
Airport South in Nagpur is reportedly the first metro station in India to implement DRDO's biodigester technology!
MahaMetro, Nagpur’s metro service, is looking to be an environmentally friendly service, along with providing the city with effective public transport.
Update: An earlier version of this article wrongly misattributed the source of the information. The correct credit/attribution for the information below is here. The error is regretted. – Editor
To that end, the Metro stations will be developed as Green Stations under the green rating program of the IGBC, as per a report in the Times of India.

Maha Metro rail. Photo Source – Twitter
Some of the proposed energy-saving and sustainable features include:
• Solar Farming
• Bio-digesters for sewage treatment
• Reforestation
• Electric/solar-powered Feeder Vehicles
• Double glazed building envelope with sun-shading elements
• Rain-water Harvesting
• LED Lights
• Efficient Central Air-conditioning
• Pre-cast construction methodologies to save time and cost
Steps have been taken to implement this from the development stage itself. Some of these steps are as follows:
• Bio-digester Technology
Airport South will reportedly be the first Metro station in the country to implement this technology which was conceived by the DRDO to degrade and convert human waste into usable water and gasses in an eco-friendly manner.
• Rainwater-harvesting
The stations will come equipped with rainwater harvesting system to avoid wastage of rainwater and to recharge groundwater.
• Soil conservation
The soil removed during construction is being used for planting native trees, which require less water, on the premises of the metro stations.
(Edited By Vinayak Hegde)