The Principal Facilities Engineer will be responsible for providing engineering support to operating the Assai Renewal Natural Gas (RNG) plant located in Throop, PA. A key asset for Archaea Energy, this facility converts landfill gas, collected at the landfill, into pipeline quality natural gas (High Btu or Renewable Natural Gas). The facility processes the landfill gas by removing the majority of the non-methane components including CO2, Nitrogen, water, sulfur and volatile and non-volatile organic compounds to attain pipeline quality gas. The support will range from plant optimization to small upgrade projects. This role will work closely with Operations and Maintenance personnel at the plant in support of achieving plant runtime and production KPI's. They will also work closely with in-house Engineering teams and 3rd party Engineering Contractors to develop workpack deliverables for plant modifications. A key accountability will be maintaining and updating Process Safety Information for the plant. The successful candidate must be able to report to the plant in Throop, PA at least 3 days per week. You must live near the site or be willing to relocate to report into the site to be considered for the role.