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Viridi Energy Acquires Maine Digester Facility for Industry-Leading Biosolids-to-RNG Project

The deal, leveraging an agreement with Casella Waste Systems, Inc., marks a major step in offering a sustainable, cost-effective waste solution that complies with the state’s new biosolids management rules.

Viridi Energy (“Viridi” or “the firm”), a leading renewable natural gas (RNG) platform, announced today that it has acquired a legacy biosolids digester plant in Brunswick, Maine, with plans to transform the site into an industry-leading waste-to-RNG facility. The facility will generate valuable renewable energy and help power the local community, offer a sustainable and cost-effective solution for managing biosolids, and support compliance with local regulations aimed at mitigating per-and polyfluoroalkyl substance (PFAS) contamination in the region.

In connection with the acquisition, Casella Waste Systems, Inc. (Nasdaq: CWST) (“Casella”), a regional solid waste, recycling, and resource management services company, will manage feedstock collection and delivery logistics for an estimated 85,000 tons of biosolids per year collected from a network of wastewater treatment plants. At Viridi’s overhauled Brunswick facility, the biosolids will be transformed, via anaerobic digestion, into enough energy to heat more than 3,000 homes for a year. The facility will also supply electricity directly to Brunswick Landing, the 3,300-acre campus featuring more than 1.6 million square feet of commercial, industrial, and professional office space that is home to both the Brunswick facility and more than 160 other companies.

“Viridi continues to lead the industry with innovative solutions that help overcome challenges in both the waste management and energy sectors, and this project signals the team’s ongoing emphasis on diversifying our waste feedstocks and expanding our processing capabilities to meet growing renewable energy needs,” said Dan Crouse, CEO of Viridi. “We are excited to be working with Casella, whose established track record in successfully managing multifaceted waste streams will be pivotal to our success. Casella has been at the forefront of finding a sustainable solution to this issue since the law prohibiting land application of biosolids was enacted and has played a significant role in bringing this vital piece of infrastructure online.”

In addition to fulfilling growing demand for RNG, this project will yield numerous environmental benefits across Maine. Once completed, the facility will offer an innovative solution for managing waste that complies with Maine’s PFAS regulations while allowing Casella to once again put the material to a higher and better use for its customers rather than send it directly to disposal.

With Maine laws now prohibiting the practice of land-applying biosolids digestate in agricultural settings because of PFAS concerns, wastewater treatment facilities are facing the choice between two less sustainable alternatives: trucking the material long distances or landfilling it, where it requires stabilization and takes up large volumes of space – a strategy that is especially problematic in landfill-constrained Maine.

The anaerobic digestion solution offered at Viridi's Brunswick facility is expected to reduce the volume of the biosolids by nearly 90 percent, from 85,000 wet tons down to 10,000 tons once the material has been digested and dried. Once processed, Casella will transport this more stable, post-process digestate to landfill in a form that preserves landfill capacity, lessens the need for stabilization material, and reduces transportation distances.

“Our agreement with Viridi represents a major step toward finding a sustainable solution for Maine’s biosolids,” said John W. Casella, Chairman & CEO of Casella Waste Systems, Inc. “The need for efficient, responsible biosolids treatment and disposal solutions has never been more pressing. We are pleased to be working with Viridi to provide a comprehensive approach for managing this waste stream in a safe, sustainable, and beneficial way.”

With the development of this relationship, Viridi and Casella are providing a sustainable pathway for Maine municipalities to reduce uncertainties in managing their biosolids. Viridi is currently conducting siting, permitting, and environmental due diligence at the Brunswick site. Retrofit construction of the Brunswick facility is expected to be complete by the second half of 2025, with full operations slated to commence in 2026.

Viridi’s Brunswick acquisition marks the firm’s fourth high-profile deal announcement in the last year. In March 2023, Viridi announced its partnership with Marathon County, Wisconsin, to convert the county’s landfill emissions into clean RNG, equal to more than three million gallons of gasoline annually. In May 2023, the firm announced a partnership with Baldwin County, Alabama, to develop a waste-to-RNG project at that county’s landfill, and in June 2023, it announced it was partnering with American Organic Energy to develop one of the largest food waste-to-RNG projects in the United States.

About Viridi Energy

Viridi Energy is a full-service renewable natural gas investor, operator, and partner founded by a veteran RNG management team. With the backing of Warburg Pincus and Green Rock Energy Partners, the firm’s platform builds, owns, and operates RNG assets with landfill, dairy, wastewater, and food waste feedstocks across North America. For more information, please visit Follow Viridi Energy on LinkedIn.

About Casella

Casella Waste Systems, Inc., headquartered in Rutland, Vermont, is one of the largest recyclers and most experienced fully integrated resource management companies in the Eastern United States. Founded in 1975 as a single truck collection service, Casella has grown its operations to provide solid waste collection and disposal, transfer, recycling, and organics services to more than one million residential, commercial, municipal, institutional, and industrial customers and provides professional resource management services to over 10,000 customer locations in more than 40 states.

Casella Safe Harbor Statement

Certain matters discussed in this press release, including, but not limited to, the statements regarding intentions, beliefs or current expectations concerning, among other things, the benefits of the proposed program, are “forward-looking statements” intended to qualify for the safe harbors from liability established by the Private Securities Litigation Reform Act of 1995. These forward-looking statements can generally be identified as such by the context of the statements, including words such as “believe,” “expect,” “anticipate,” “plan,” “may,” “would,” “intend,” “estimate,” "will," “guidance” and other similar expressions, whether in the negative or affirmative. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which Casella operates and management’s beliefs and assumptions. Casella cannot guarantee that it actually will achieve the benefits disclosed in the forward-looking statements made. Such forward-looking statements, and all phases of Casella's operations, involve a number of risks and uncertainties, any one or more of which could cause actual results to differ materially from those described in its forward-looking statements. Such risks and uncertainties include or relate to, among other things, the following: the biosolids digester plant in Brunswick, Maine may not be successfully converted into a waste-to-RNG facility or generate renewable energy that can be used to power the local community; the operation of such plant may not be sustainable as a cost-effective solution for managing biosolids, and such operation may not satisfy laws and regulations aimed at mitigating per-and polyfluoroalkyl substance (PFAS) contamination in the region as they may evolve from time to time.

There are a number of other important risks and uncertainties that could cause Casella’s actual results to differ materially from those indicated by such forward-looking statements. These additional risks and uncertainties include, without limitation, those detailed in Item 1A. “Risk Factors” in Casella’s most recently filed Form 10-K and in other filings that Casella may make with the Securities and Exchange Commission in the future.

Casella undertakes no obligation to update publicly any forward-looking statements whether as a result of new information, future events or otherwise, except as required by law.


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