Renewable Natural Gas (RNG) Controls Engineer

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      About the role

      The Renewable Natural Gas (RNG) Controls Engineer is responsible for designing, improving, and supporting control systems for RNG production facilities, with a practical focus on reliable plant operation. This role combines home-office engineering, field troubleshooting, commissioning support, and ongoing optimization of instrumentation, PLC, HMI, and SCADA systems. The Controls Engineer works closely with operations, maintenance, engineering, OEM suppliers, and environmental teams to improve gas quality, plant uptime, process safety, and regulatory compliance across operating anaerobic digestion facilities.

      Responsibilities

      • Design, program, and maintain PLC, HMI, and SCADA systems for RNG plant operations.
      • Develop and optimize control strategies for feedstock receiving systems, gas upgrading systems, compression systems, flare systems, digesters, and utility systems.
      • Configure and troubleshoot industrial communication protocols including Modbus, Ethernet/IP, Profibus, and OPC.
      • Develop and maintain controls standards, preferred hardware configurations, programming practices, network architecture, and documentation templates that can be applied consistently across multiple RNG facilities while still allowing site‑specific adaptation.
      • Support design, procurement, installation, commissioning and startup of new equipment and plant expansions.
      • Implement alarm management and process interlocks to improve plant safety and reliability.
      • Review control system deliverables from OEMs, system integrators, and engineering contractors, including control narratives, cause‑and‑effect logic, loop diagrams, I/O lists, network drawings, panel drawings, factory acceptance test procedures, and commissioning documentation.
      • Specify, install, calibrate, and maintain process instrumentation including pressure, flow, temperature, methane analyzers, H₂S analyzers, and moisture analyzers.
      • Troubleshoot control valves, VFDs, motors, analyzers, and field devices.
      • Review and maintain P&IDs, control narratives, electrical one‑lines, and instrument loop drawings.
      • Support electrical systems up to medium voltage where applicable.
      • Analyze plant performance data to improve methane recovery, gas quality, and system efficiency.
      • Develop and monitor KPIs and performance dashboards for operational improvement.
      • Optimize digester gas handling, upgrading systems, and pipeline injection controls.
      • Support root cause analysis for process upsets and downtime events.
      • Ensure plant control systems are designed, configured, documented, and maintained in accordance with applicable OSHA, NEC, NFPA 70, NFPA 70E, ISA, EPA, and local regulatory requirements.
      • Support environmental reporting and emissions compliance through data collection systems.
      • Participate in Process Hazard Analysis (PHA), Management of Change (MOC), and HAZOP reviews.
      • Prepare or review controls‑related Management of Change documentation for software revisions, setpoint changes, interlock modifications, alarm changes, instrument replacements, and control strategy updates that affect plant operation or safety.
      • Maintain appropriate industrial control system cybersecurity practices, including user access control, network segmentation, backup and recovery practices, vendor remote access controls, and coordination with corporate information technology standards.
      • Develop preventative maintenance plans for controls and instrumentation systems.
      • Lead troubleshooting efforts during unplanned outages.
      • Provide remote and on‑site troubleshooting support for operating facilities, including review of trend data, alarm history, equipment status, analyzer readings, and operator feedback to diagnose controls‑related causes of downtime or unstable operation.
      • Support spare parts inventory management for critical controls components.

      Qualifications

      • Bachelor’s degree in Electrical Engineering, Controls Engineering, Chemical Engineering, or related field.
      • 10+ years of industrial controls engineering experience in process plant, manufacturing, energy, utility, or infrastructure environments, including direct involvement with operating facilities, commissioning, troubleshooting, or field support.
      • Hands‑on experience developing, modifying, troubleshooting, and supporting PLC programs using platforms such as Rockwell Automation Studio 5000, Siemens TIA Portal, or Schneider EcoStruxure.
      • Hands‑on experience configuring, troubleshooting, and supporting industrial SCADA systems such as Ignition SCADA, Wonderware, or similar platforms in operating process‑plant environments.
      • Strong understanding of industrial instrumentation and process controls.
      • Knowledge of biogas, anaerobic digestion, gas upgrading, landfill gas, wastewater treatment, natural gas processing, or comparable process systems involving gas treatment, compression, analyzers, and utility interfaces.
      • Familiarity with P&IDs, electrical schematics, and control narratives.
      • Ability to develop, interpret, and maintain controls documentation, including control narratives, cause‑and‑effect matrices, alarm rationalization records, instrument indexes, I/O lists, loop diagrams, network architecture drawings, and functional test procedures.
      • Working knowledge of NEC, NFPA 70, and ISA standards.
      • Demonstrated ability to diagnose ambiguous operating problems by combining process knowledge, control logic review, field observations, operator input, and historical data trends.
      • Willingness to travel regularly to operating RNG facilities and project sites, with additional travel during commissioning, startup, outages, troubleshooting events, or major controls upgrades.
      • Willingness to respond to emergencies remotely on a 24/7 basis.
      • Preferred: Professional Engineer (PE) license.
      • Preferred: Experience in renewable natural gas, anaerobic digestion, landfill gas, wastewater treatment, waste‑to‑energy, refining, petrochemical processing, chemical manufacturing, midstream gas, or other process industries involving complex rotating equipment, analyzers, utilities, safety systems, and continuous operations.
      • Preferred: Knowledge of membrane separation, PSA systems, amine systems, or cryogenic gas upgrading.
      • Preferred: Experience with pipeline injection and gas quality compliance.
      • Preferred: ISA Certified Automation Professional (CAP) certification.

      Benefits

      • Medical, dental, and vision (eligibility after just 30 days of employment)
      • Paid time off that increases with tenure
      • A 401(k) with company match and immediate vesting
      • A new employee training program and many opportunities for continued learning and career development
      • Disability and life insurance
      • Employee recognition program
      • Generous tuition assistance program
      • Propane discounts, and more!

      Pay

      $145,000 - $160,000 annually (dependent on experience)

      Check for any leftover boilerplate: We removed the corporate description, EEO, application instructions, etc. Also removed the line "Coordinate with OEM $145,000 - $160,000 annually (dependent on experience)" from responsibilities; we moved salary to Pay section. Ensure we didn't lose any other substantive info: The responsibilities list includes all items from the original sections: Controls & Automation Design..., Instrumentation & Electrical Systems..., Process Optimization..., Compliance & Safety..., Maintenance & Reliability... We captured each bullet. Did we miss any? Let's verify original responsibilities sections: - Controls & Automation Design, program, and maintain PLC, HMI, and SCADA systems for RNG plant operations. - Develop and optimize control strategies for feedstock receiving systems, gas upgrading systems, compression systems, flare systems, digesters, and utility systems. - Configure and troubleshoot industrial communication protocols including Modbus, Ethernet/IP, Profibus, and OPC. - Develop and maintain controls standards, preferred hardware configurations, programming practices, network architecture, and documentation templates that can be applied consistently across multiple RNG facilities while still allowing site-specific adaptation. - Support design, procurement, installation, commissioning and startup of new equipment and plant expansions. - Implement alarm management and process interlocks to improve plant safety and reliability. - Review control system deliverables from OEMs, system integrators, and engineering contractors, including control narratives, cause-and-effect logic, loop diagrams, I/O lists, network drawings, panel drawings, factory acceptance test procedures, and commissioning documentation. - Instrumentation & Electrical Systems: Specify, install, calibrate, and maintain process instrumentation including pressure,