HoSt Energy Systems has signed agreements with Five Bioenergy to deliver five of Spain’s largest biogas facilities, with sites located in the Castilla y León, Aragón, and Murcia regions.
The projects include advanced biogas upgrading systems capable of producing close to 0.8 TWh of biomethane annually, along with CO₂ liquefaction plants to capture and process carbon dioxide generated during anaerobic digestion. Two of the projects—Milagros and Lorca—entered construction earlier this year.
At Milagros, the facility will feature three primary digesters and two secondary digesters, while Lorca will house six primary and three secondary digesters. Each digester measures 40 meters in diameter and 8 meters in height.
HoSt will deliver the full technology suite for the plants, including feeding systems, mixers, domed roofs, sensors, control systems, piping and cabling, and heat exchangers. These heat exchangers will ensure stable temperature conditions within the digester tanks despite regional climate variations.
To maximize renewable energy production, both projects are equipped with biogas upgrading and CO₂ liquefaction systems supplied by Bright Renewables. Combined, the facilities are expected to yield 29 million Nm³ of biomethane and over 40,000 tonnes of liquid food-grade bio-CO₂ annually.
The two plants will process up to 387,000 tonnes of agricultural and organic waste each year, including cow, sheep, and poultry manure, expired food, slaughterhouse waste, and distillery byproducts. All feedstock is sourced from local farmers, who will benefit from the return of nutrient-rich digestate as biofertilizer.
Additionally, both sites will feature osmotic water recovery technology to provide water for dilution in the AD process, helping to preserve clean water—a critical and regulated resource in Spain.
“We are proud to partner with Five Bioenergy on these two large-scale biogas projects in Spain, with three more in the pipeline,” said Sjaak Klein Gunnewiek, Head of Sales Biogas Projects at HoSt Energy Systems. “Combining our anaerobic digestion expertise with Five Bioenergy’s sustainable waste management vision allows us to set a new standard for biomethane production in Spain.”
José Gross Godoy, Regional Manager Biogas at HoSt, added: “These plants align with Spain’s 2030 target of 20 TWh/year of biomethane production. With one of the largest untapped feedstock potentials in Europe, Spain offers immense promise for the biogas industry. Collaborating with Five Bioenergy has been like working with colleagues—our shared goals have strengthened our partnership and commitment to decarbonisation.”
Workforce and Community Impact
Ahead of plant commissioning, future site managers will receive intensive training in the Netherlands at a HoSt-operated facility. Local technical operators will be trained via schools and during the commissioning process to ensure safe and efficient operation.
Five Bioenergy, a subsidiary of Five E, selected HoSt for its deep expertise and proven technology. The initiative is supported by Asterion, Five’s financial partner, which backs environmentally responsible and resilient investments.
“These facilities represent more than just energy infrastructure—they are catalysts for social impact,” said Rubén Garcia, Head of Operations and Management at Five Bioenergy. “They offer local farmers a sustainable outlet for organic waste, generate clean energy, and support community initiatives. Meals for staff will be provided by a local elderly care home, and we plan to sponsor nearby football teams and collaborate with schools to train future technical talent. These are the first of many planned facilities across Spain and Portugal, supporting our broader mission of sustainable energy transformation.”