Green gas: A circular opportunity for water boards
Water boards treat vast amounts of wastewater daily, leaving behind sewage sludge. This sludge presents an opportunity to contribute to the energy transition by digesting it into biogas, which can then be upgraded to green gas. By doing so, water boards can make their energy supply more sustainable and play a circular role in the energy market.
From sludge to green gas
As a water board, you have unique opportunities to act as a circular energy plant. Large quantities of sewage sludge can be converted into biogas and subsequently upgraded to natural gas quality. This green gas can be injected, or fed, into the natural gas network.
Learn more about the difference between biogas and green gas in the article ‘What exactly is green gas?’.
Why become a green gas supplier?
Digesting sewage sludge to produce green gas offers multiple benefits for water boards:
- Circular energy production
Utilize waste streams to generate sustainable energy.
- CO₂ reduction
Converting biogas into green gas replaces fossil fuels.
- Free raw material
You already have access to sewage sludge as a free resource for biogas production.
- Additional revenue stream
Green gas can be sold and fed into the regular natural gas network, generating extra income.
- Sustainable leadership and role model
As a water board, you can set an example in circular resource and energy management. With approximately 145 million cubic meters of biogas per year, water boards rank among the largest producers in the Netherlands.
Opportunities for a circular energy plant
By producing green gas, water boards can contribute to a more sustainable Netherlands while making energy supply more efficient. The circular energy plant becomes a reality.
Ready to get started with green gas?
Strict quality requirements apply to feeding green gas into the grid. Want to know how to get started? And which quality standards and certifications to consider? Find out more in the online step-by-step guide: ‘How to start feeding green gas?’.

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