Environmental Systems Group

Environmental Systems Group operates as ESC Spectrum, a provider of continuous emissions monitoring systems (CEMS) and data acquisition systems (DAS). The firm designs, builds, and maintains the hardware and software that industrial facilities use to comply with EPA air-quality regulations, including analyzers, probes, data controllers, and the StackVision DAS platform. Its services cover the full lifecycle from installation and calibration to regulatory reporting and 24/7 support.

ESC Spectrum is now part of Alliance Technical Group. The firm operates as Alliance's dedicated CEMS and DAS compliance platform, retaining its brand, product lines, and support infrastructure while gaining access to Alliance's broader customer base and environmental services capabilities.

Emissions-monitoring equipment and software are mandatory for Clean Air Act operating permits at thousands of industrial sites. Once installed, CEMS and DAS systems are expensive to replace and require ongoing maintenance, calibration, and reporting services. This regulatory requirement creates long-duration service contracts and repeat parts revenue that are difficult for competitors to displace.

ESC Spectrum's equipment monitors emissions at refining and petrochemical facilities, power generation plants, natural gas midstream operations, and other sources subject to EPA air-quality standards. Its customer base includes facilities regulated under Part 75 (acid rain program) and state-level continuous monitoring mandates.

ESC Spectrum has a publicly cited collaboration with the Electric Power Research Institute (EPRI) on an Integrated Path CEMS project. The IP CEMS technology, which uses optical in-situ monitoring to replace traditional extractive system components, received EPA acceptance as an alternative monitoring method.

The firm operates domestically within the United States, with field service, support, and engineering resources capable of reaching industrial facilities nationwide. Its customer references include plants in Texas, Michigan, Nebraska, and other states with significant industrial emissions sources.

ESC Spectrum launched Interim Reporting Services to help facilities maintain compliance during short-term staffing gaps. The program provides temporary support for data review, permit compliance, quality assurance, and regulatory reporting, ensuring plants do not miss Clean Air Act filing deadlines when environmental staff turn over.