Biogas units run for housing societies that must now process their own wet waste
TL;DR Hearthloop installs a biogas digester in a housing society and runs it for a monthly fee, so the society meets its legal duty to treat wet waste on site. The gas goes to a common kitchen, canteen or generator. The society pays for compliance it no longer has to babysit.
If you live in a big housing society, your kitchen waste is now your society's legal problem. Mumbai already required societies over 20,000 sq m, or producing 100 kg of waste a day, to treat it on their premises[3]. The Solid Waste Management Rules 2026, in force from 1 April 2026, name residential societies as bulk waste generators and expect wet waste to be processed on site where feasible[4].
Many societies bought composters to comply and then watched them stall. Even the city isn't immune - only six of its twelve earlier civic biogas plants were working in March 2026[2]. A machine without an operator turns into a smelly corner.
What it does, in regulatory terms: on-site processing of segregated wet waste under the SWM Rules 2026. It is not a gas utility. The gas is used inside the premises, which keeps it outside piped-gas distribution rules, but confirm safety norms with your state pollution control board and fire department.
Here's how it works. Hearthloop sizes a digester to the society's daily wet waste, typically 300 kg to 1 tonne for 300–1,000 homes, and then installs it, trains housekeeping on segregation and sends a technician on a fixed schedule so nobody on the committee has to think about it. Simple meters log waste fed in and gas produced, and the society gets a monthly compliance report it can show the city.
The gas runs a staff canteen, a common kitchen or a small generator for common-area lights. The leftover slurry becomes garden manure.
The society's managing committee pays from maintenance funds. One Pune society of 550 homes paid ₹23 lakh (US$31,000) for its plant and reported saving up to ₹6,000 a month on municipal disposal plus about ₹550 a day on common-area power[1]. Hearthloop would offer either a one-time sale with a yearly service contract or a monthly fee per household with no upfront cost.
The 2026 rules took effect on 1 April 2026 and add environmental compensation for non-compliance[4]. That turns a nice-to-have into a line item. Cities are also buying biogas at scale, and Greater Bengaluru sells biogas at ₹70 a kg from its Koramangala plant and is planning much larger facilities[2].
There is no published count of housing societies that qualify as bulk waste generators, and no market figure for society biogas. One Pune vendor alone had units at more than 75 locations by 2021[1]. Bengaluru's estimate that a tonne of wet waste yields 30–50 kg of biogas[2] lets you size the value per site. Build your own count from city property tax and society registration lists.
One Pune waste firm sells community digesters and had more than 75 installs by 2021[1]. An Israeli maker sells small household units worldwide[5]. Many composting vendors serve societies but leave the running to housekeeping staff. The gap is a vendor that owns uptime and the compliance paperwork, not just the machine.
| Difficulty | Moderate (46/100) |
| Starting capital | ₹1.2–2.2 Cr |
| Time to launch | 6–9 months |
Digesters are proven, so the hard work is running them. Feed quality drives everything - plastic and too much citrus or oil upset the process. You need technicians who visit on time across a city, and a segregation habit that survives staff turnover.
Yes, a few permissions apply, mainly because a gas-producing plant sits inside a residential society.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust AI with safety calls on gas storage or burners. Those need a trained technician and the fire department's rules.
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Here's what can go wrong -
I like this one as a service business, as long as you have plant-operations experience and the patience for committee meetings (lots of them). If you want to sell equipment and walk away then it's not for you. Prove first that ten societies stay above 90% uptime for six months on your service model.
Plan for roughly ₹1.2–2.2 Cr, most of it in digesters, installation and a technician team that covers a city.
Possibly. Check whether your state pollution control board wants a consent for your plant size, and get the fire department's advice before you install. The usual company and GST registration apply too.
Yes, where cities push buildings to process food waste on site. Check local gas safety and environmental permits first.
The free Hearthloop validation kit has the line-by-line capital breakdown, the effort scoring, the waste-rules and safety checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for society committees, and 5 assumptions to test. Download the kit →
Thinking about building Hearthloop or something close to it? The make-or-break work is keeping plants running when segregation slips and staff change, and that's where I can help you plan. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.