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Onnu has entered a strategic partnership with ReGenEarth to supply technology and engineering for a new integrated anaerobic digestion (AD) and pyrolysis project at ReGenEarth’s Sedgefield site at Hope Farm, a 3,500 acre dairy operation that supplies milk to Arla.

The project expands the farm’s existing AD facility into a combined renewable energy and carbon removal hub. It will incorporate biochar production using Onnu’s CarboFlow pyrolysis system, which converts agricultural residues into a stable carbon product.

The system links AD and pyrolysis in a closed-loop process: agricultural residue feeds the digester, the resulting digestate is dried using heat from pyrolysis, and the dried material is then processed into biochar. Crop residues are returned to the AD plant, continuing the cycle.

The development is funded through ReGenEarth’s £100 million Green Bond programme with RER Capital, which supports a wider roll-out of integrated AD–pyrolysis sites and related feedstock and carbon credit tracking.

Two CarboFlow units will be added to the Sedgefield AD facility to maximise material and energy recovery. The set-up is designed to enable full utilisation of digestate, incorporate arboreal residues as an additional feedstock and operate with heat recovered from the process to minimise external energy demand.

Once operational, the site is expected to produce 2,266 tonnes of biochar per year, generate 2.8 MW of recoverable thermal energy and deliver 4,300 tonnes of CO₂e removal eligible under the Puro Earth carbon credit framework.

ReGenEarth intends to use the Sedgefield project as a model for further AD–pyrolysis developments in the UK and internationally.

Giles Welch, CEO of Onnu, said: “This partnership demonstrates what is possible when engineering innovation meets a bold sustainability vision. Sedgefield is an ideal setting, a working dairy farm supplying Arla, proving that agriculture, carbon removal and renewable energy generation can be fully integrated in a practical, commercially viable way."

"CarboFlow was designed precisely for this purpose: to unlock the commercial potential of pyrolysis at scale, making projects like this replicable across the UK.”

Mickey Rooney, CEO of ReGenEarth, added: “We have today reaffirmed our leadership in transforming the anaerobic digestion and standalone power generation sectors, through the final stages of our latest project, integrated pyrolysis solutions. In partnership with Onnu, which provides and manages the cutting-edge technology on-site, ReGenEarth is deploying systems that significantly advance carbon avoidance and sequestration."

"Our model is built on integration. We don't just implement technology; we orchestrate the finest talent in the field. By weaving the specialised capabilities of partners like Carma, Puro, Be Zero and Marsh into a cohesive tapestry of ‘tools, talent and techniques’, we are accelerating a tangible cure for climate change. This unique approach positions ReGenEarth to generate the highest count of high-quality Carbon Credits available anywhere in the world, providing corporations and investors with an unmatched vehicle for achieving their net-zero ambitions.”