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Project sponsor

Launch date


Domaines d'application

Circular economy
Rural employment
Animal and environment respect
Green mobility
Recycling (water)

Mobilité durable


The GreenPig project transforms pig urine into green hydrogen for sustainable mobility, within a global circular economy approach, recovering 100% of by-products.


GreenPig is composed of several sub-sections:

-          Livestock buildings

-          A building for processes such as urine filtration, ammonia stripping, electrolysis and auxiliary activities (compression, storage…),

-          PV panels on the building, whose electricity will be self-consumed by the process.


The aim of the project:

     Stabilise employment in a rural area,

     Guarantee responsible production respecting the animals and the environment,

     Contribute to the development of carbon-free mobility in central Brittany



Project objectives:

  • Techniques: Use pig urine to produce 70,000 kg of green H2/year and 145t of ammonium sulphate/year. Reusing 66% of the water contained in the urine.


  • Energy related:

-    Produce green H2 (200 kg of green H2/day),

-    Increase the yield of the electrolyser (Reuse 100% of the electrolyser’s waste heat for stripping the ammonia),

- Produce and 100% self-consume PV electricity (production 420 MWh)


  • Environmental:   

Completely eliminate the ammonia emissions from livestock (recovery and use of 100% of the ammonia contained in the urine by stripping and transforming into green fertiliser), aiming to:

- reduce the pollution of groundwater tables (100% of excretions will be transformed into energy),

- reduce the carbon footprint per kilo of pork produced (20% reduction of the existing carbon footprint [currently at 2.6 kg eq.CO2/kg of pork]),

- but also, to initiate the deployment of H2 mobility in central Brittany (Creation of 3 H2 stations in Saint Brieux), and to produce oxygen through electrolysis (1500 kg of O2/day Eq. to a 56 ha forest)


  • User involvement: Raising the awareness of the public with a GreenPig visitor circuit and a glass wall to make the process visible from outside. More globally the project aims to deploy the hydrogen mobility industry in Brittany.


  • Economic: Construction of a viable and duplicable business model (Creation of a project company with a consortium of partners, Purchase of green electrons)


  • Industrial: Create a local energy loop, combining the production and storage of green H2 (production of 200 kg/day of green H2, production of 145t of ammonium sulphate per year),

In the long term: provide an industrial agricultural process respecting the environment and animal welfare (Production of 10,000 “GreenPigs”)


  •  Commercial: create a new range respecting the welfare of the pigs and the environment, involving the creation of a GreenPig certification. But also, to create a production-use system for green H2 and green ammonia in central Brittany.


Added value of the project:


This project is a local hydrogen loop in line with a global circular economy process. It perpetuates employment in a rural area, respects animal welfare and the environment. It encourages carbon-free mobility in central Brittany, includes water recycling and the production and self-consumption of electricity. It is replicable internationally.


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