Converting Waste into Clean Energy for a Sustainable Future
RETTEW regularly works with wastewater treatment plants managing biosolids, food processors with organic waste streams, and agricultural operations facing manure management challenges, and we know the pressures these operations encounter daily. Your facilities face mounting pressure to reduce waste disposal costs, meet sustainability commitments, and generate new revenue, all while navigating complex regulations and uncertain economics. Renewable natural gas (RNG) offers a proven pathway to transform these waste challenges into competitive advantages.
Municipalities and industries seeking to unlock the energy potential of organic waste streams face a complex landscape. Carbon credit markets create genuine revenue opportunities through incentives and credits, but project economics also depend on feedstock quality, gas upgrading costs, and pipeline access. Regulatory requirements span Environmental Protection Agency (EPA) biosolids standards, pipeline interconnection specifications, and state permitting frameworks. For organizations navigating this landscape, success requires rigorous feasibility analysis, process optimization expertise, regulatory mastery, and partners who understand both the technical requirements and market realities of RNG development.
RETTEW helps communities and businesses convert waste into valuable resources while achieving their sustainability goals and energy independence. Through our expertise in anaerobic digestion and biogas systems, renewable natural gas pipelines, metering and regulation, and virtual pipeline systems, we develop comprehensive approaches to managing RNG projects from initial assessment through long-term operations. Our expert team uses advanced process modeling, feedstock analysis, and system integration tools to design efficient co-digestion systems that maximize biogas yields from diverse waste streams, including food waste, agricultural residues, and wastewater sludge.
Strategic RNG Development Drives Project Success
Renewable natural gas development requires thoughtful planning that supports operational goals, manages costs, and meets stringent regulatory requirements. How your system is designed and how your infrastructure adapts directly impact efficiency, long-term costs, and compliance. At RETTEW, we understand infrastructure decisions affect every aspect of RNG operations—from feedstock handling and digester optimization to pipeline interconnection and carbon credit generation. These foundational decisions shape your facility’s operational and financial success for decades.
The Market Realities RNG Developers Face
The RNG market is driven by complex carbon credit mechanisms and voluntary carbon markets. Successfully navigating these programs requires expertise in carbon intensity scoring, pathway certification, and market positioning. RETTEW brings deep understanding of these mechanisms and works with clients to optimize project design for maximum environmental credit value while ensuring regulatory compliance and documentation requirements are met from project inception.
Beyond production, we design and implement renewable natural gas pipeline infrastructure, metering systems, and regulation equipment to enable safe and efficient gas delivery. RNG injection into natural gas pipelines requires rigorous adherence to gas quality specifications, including moisture content, heating value, and contaminant levels. RETTEW’s engineers design comprehensive upgrading systems, gas conditioning equipment, and interconnection facilities that meet pipeline operator requirements. Our virtual pipeline systems expertise enables clients to transport RNG to markets where traditional pipeline connections aren’t feasible, expanding access to renewable energy markets.
Maximizing biogas production requires careful analysis of feedstock characteristics, digester loading strategies, and co-digestion opportunities. RETTEW conducts comprehensive feedstock analysis, pilot testing programs, and process optimization studies to identify the most productive and economically viable waste stream combinations. Our supplemental feedstock evaluation services help clients identify and secure high-value co-digestion materials, such as food waste, fats-oils-grease (FOG), and agricultural residues that dramatically improve gas yields and project economics.
How RETTEW Supports RNG Development
Feasibility Studies and Technology Evaluation – RETTEW conducts comprehensive feasibility studies that evaluate feedstock availability, biogas production potential, technology options, and project economics. Our seasoned team can assist in the evaluation of technology for implementation, comparing anaerobic treatment systems, temperature phasing approaches, and integrated heat/power/drying configurations. This protects your timeline and capital while ensuring projects support your long-term operational and financial goals.
Anaerobic Digestion and Biogas System Design – RETTEW designs complete anaerobic digestion facilities, from feedstock receiving through biogas use. Our facility design services include anaerobic digestion systems, anaerobic treatment processes, temperature phasing configurations, acid reactors, and integrated heat, power, and drying systems. We design flexible systems that accommodate feedstock variability, technology evolution, and changing operational needs, so your infrastructure supports both current operations and future expansion.
Class A Biosolids and Regulatory Compliance – RETTEW is a leader in the design and permitting of anaerobic digestion systems to meet EPA’s 503 Regulations for Class A Biosolids. This provides numerous options for our municipal partners, whether leveraging existing infrastructure or shifting to new technologies that improve operational efficiency. Our regulatory expertise guarantees projects meet federal and state requirements for pathogen reduction, vector attraction reduction, and land application protocols, opening valuable end-use markets for digested materials.
Energy Production and RNG Offtake – RETTEW has extensive experience in RNG offtake, whether it’s for electrical generation through combined heat and power (CHP) or direct injection through RNG upgrading. Our energy production and distributed generation services optimize biogas use strategies, comparing on-site power generation, pipeline injection, and virtual pipeline options. We design complete systems including gas upgrading equipment, compression, metering and regulation infrastructure, and interconnection facilities.
Engineering, Procurement, and Construction Integration – We leverage strategic partnerships to deliver comprehensive engineering, procurement, and construction (EPC) solutions for complex projects, providing seamless service integration that eliminates the challenges of managing multiple contractors while maintaining accountability, clear communication, and efficient project execution. Our integrated approach ensures design intent translates to operational reality.
Why RNG Developers Choose RETTEW
Renewable natural gas development demands more than process design. It requires a partner who understands carbon credit markets, feedstock economics, gas quality requirements, and the regulatory complexity that RNG operators face in a rapidly evolving market environment. RETTEW’s specialized expertise spans infrastructure design, regulatory compliance, and renewable energy development, enabling streamlined, effective solutions to the most complex waste-to-energy challenges.
We have designed and managed more than a dozen significant projects in the last five years that used manure, food waste residuals, and wastewater sludge systems for resource recovery. Our in-house experts can also guide your project through funding and long-term operations, focusing on current and future budget impacts. RETTEW’s comprehensive technical expertise and deep regulatory knowledge, combined with our commitment to sustainable solutions, empower our clients to harness the transformative potential of anaerobic digestion technology.
Whether you’re developing agricultural digester systems, wastewater treatment plant biogas projects, food waste-to-energy facilities, or landfill gas-to-RNG systems, RETTEW manages the process design, infrastructure coordination, and permitting challenges that determine project success. Our partnership spans from initial feasibility assessment through commissioning and beyond, supporting your facility as regulations and markets evolve.
Together, we help you deliver innovative carbon-negative energy systems that seamlessly convert waste challenges into valuable environmental and economic opportunities, paving the way for a cleaner, more sustainable future.
Let’s discuss how we can support your renewable natural gas project.