PurposeEnergy digester turns Danone's Ohio yogurt waste into biogas

PurposeEnergy has commissioned a food waste and wastewater pre-treatment facility in Minster, Ohio. The investment tops $40 million, and the facility sits in the village's Route 66 Industrial Park beside Danone USA's largest U.S. yogurt plant. Food Engineering reports it is PurposeEnergy's first project with Danone. It is already operational: residuals arrive by pipe from the yogurt plant, and biogas goes back the other way.

Eric Fitch, PurposeEnergy's founder and CEO, put the pitch plainly in the company's statement: food manufacturers should not have to pick between growing output and meeting environmental commitments. The Minster setup is his company's attempt to make that true on one site.

Operators should test that claim from three angles: the carbon accounting, the ownership model and the neighbors who share the system. Minster is useful because all three are visible at once, and the yogurt plant on the other end of the pipe is in the middle of an expansion.

Residuals in, biogas out

The facility is designed to take up to 250,000 gallons a day of wastewater and high-strength organic residuals. At full operation it's expected to produce about 50,000 MMBtu of biogas a year.

The process is anaerobic digestion. As Sustainability Magazine explains it, microorganisms break down organic matter without oxygen, and biogas is the energy-bearing product. In Minster, that gas goes to a boiler at Danone's plant and replaces conventional natural gas. Facility Executive describes the output as renewable thermal energy, meaning biogas for process heat. So the benefit appears as pipeline gas the boiler no longer burns, not as electricity sold elsewhere.

The biogas is one of three outputs. The plant also discharges water treated to municipal standards and produces nutrient-rich soil amendments.

The supplier at the other end of the pipe is large. EnergyTech, citing reports, puts the Minster plant's output at close to 2.2 million pounds of yogurt a day across the Dannon, Activia, Oikos and Danimals brands. A source of that size gives the digester a big anchor customer next door, and the remaining capacity is open to other regional food and beverage producers.

Two carbon numbers and a boundary

PurposeEnergy estimates that piping residuals straight from Danone's plant, instead of using the previous off-site handling route, avoids about 720 tons of CO2e a year. That saving comes from location, not from microbes. The digester is close enough to the plant that a pipe replaces whatever used to carry the waste away.

The bigger figure comes from the fuel swap. Facility Executive reports that PurposeEnergy applied standard EPA/EIA combustion emission factors to 50,000 MMBtu of biogas displacing natural gas. The result is the equivalent of roughly 3,200 U.S. tons of CO2e a year.

Coverage of how the two numbers relate varies. Energy Digital says the 3,200 tons includes the roughly 720 tons from piping. Facility Executive and Food Engineering present the 3,200 figure as the combustion-factor equivalent of the biogas output alone. Both versions trace back to the same company estimates, so the boundary between them is something to confirm, not assume.

EnergyTech adds a condition to the larger figure: the project could displace about 3,200 tons "if optimally decarbonized." Put that next to the full-operation basis for the 50,000 MMBtu output, and the headline number reads as a ceiling the ramp has to reach.

Who owns the digester, and who else gains

Food Engineering describes PurposeEnergy as a company that designs, builds, owns and operates industrial anaerobic digestion infrastructure. For manufacturers, that model suggests the digestion asset could sit with the specialist rather than the plant.

Sustainability Magazine sharpens the point by calling PurposeEnergy a specialist financier as well as an operator. That combination would matter most where money for waste infrastructure competes with money for production capacity. Danone faces exactly that trade in Minster while it expands its lines.

The loop still closes at Danone's fence line. Biogas made from the yogurt residuals is piped to a dedicated boiler at the adjacent Minster plant, the same plant that produced the residuals.

The village is the third party at the table. According to Facility Executive, the digester strips out surplus nutrients and dissolved solids from its outgoing water, treating it well beyond what Minster's discharge standards require, before the flow goes on to the municipal wastewater treatment works. Mayor Craig Oldiges framed the project as building local, resilient energy into village infrastructure now, part of keeping Minster "self-reliant, vibrant, and prosperous." For the village, taking load off the treatment works is a practical benefit.

Danone tells the same three-party story. Heiko Gerling, chief operating officer of Danone Americas, said the project matters because it unites industry, local infrastructure and community stakeholders behind one common goal.

Growth on the same site

Fitch pitched the facility straight at operators planning growth. He said that locating the facility close to Danone's Minster plant lets PurposeEnergy offer its partner a solution that serves both of their goals.

There is plenty of growth to support. Danone announced a "multi-million-dollar" Minster investment in August 2025 that adds about 48,000 square feet of facility space, a new production line and upgrades to existing lines, according to Energy Digital, and the expansion is expected to create 30 full-time jobs. The company has cited "explosive growth" in demand for its yogurts as consumers look for protein- and probiotic-rich foods. More production means more residuals, and the digester gives them somewhere to go besides a truck.

Re-Fuel is Danone's global energy program. ESG Dive reports that the company aims to meet half its energy needs from renewables such as solar and biogas by 2030. Biogas replacing natural gas in a plant boiler counts toward that goal directly, which helps explain why Gerling describes the project as one where "operational growth and environmental stewardship can go hand in hand."

Danone's methane goals are a separate matter. EnergyTech notes that the company's updated Impact Journey targets include a 30% cut in methane emissions from milk production by 2030 against 2020, with net zero methane by the end of 2050. Those targets cover the dairy supply chain, not the factory floor. Minster's digester suggests the plant-side contribution runs mainly through the energy target.

Where the model travels

The setup has limits worth naming. The 720-ton saving depends on Danone's plant being next door, and the facility also takes by-products from other regional food and beverage producers. That suggests a site without a nearby digester or neighbors to share capacity may not see the same results. The Minster case fits best for plant and facilities leaders with industrial-park space, high-strength wastewater, and other food processors within reach.

There is no shortage of waste. The European Commission estimates that manufacturing and processing produce around 19% of the food waste generated across the EU, a figure both Sustainability Magazine and Energy Digital use to frame the problem. EnergyTech puts the U.S. count at close to 2,600 operational biogas capture facilities, citing the American Biogas Council, which sees potential for thousands more. It also reports $2.1 billion invested in the energy potential of food waste in 2025.

Read against those numbers, Minster is a single site in a growing field. What sets it apart is the configuration: a manufacturer-adjacent digester, owned by a specialist, sending heat back to the plant that feeds it. Processors looking at digestion can set their own site against that template.

The ramp to spring 2027

The Minster digester is running and still ramping, with a grand opening planned for spring 2027. Two things will show whether the model holds up: whether biogas deliveries to the Danone boiler reach the 50,000 MMBtu annual rate, and how many other regional producers start piping or hauling residuals into the 250,000-gallon system. If both happen by the time the ribbon is cut, Minster becomes a reference site that food plant operators elsewhere can point to when they pitch a digester next door.