Decarbonisation Technology February 2026 Issue

can demonstrate that injected CO₂ remains isolated from sources of public water supply. Together, these functions elevate tracer technology from a diagnostic tool to a cornerstone of CCS verification. By transforming interpretation into measurable evidence, tracers deliver the transparency and accountability that large-scale carbon storage depends on. Regulatory and economic alignment The rapid growth of CCS activity in the US is no coincidence. The combination of financial incentives such as 45Q, a clear regulatory framework under the EPA’s Class VI well programme, and the growing availability of geologic storage sites has created the first truly scalable market for carbon sequestration. Within that framework, tracer technology fits neatly into the compliance chain. Whereas seismic or geochemical data often require interpretation, tracer signals are definitive. They provide a chain of custody for CO₂ volumes, helping operators demonstrate the ‘secure storage’ conditions required for credit eligibility. Beyond compliance, the same dataset can underpin environmental, social and governance (ESG) reporting, offering a verifiable audit trail for investors and regulators alike. As other regions establish their own carbon markets, similar MRV frameworks are emerging. Europe’s evolving carbon-management strategy and Canada’s investment tax credits for CCUS both highlight the value of independent verification methods. Tracer evidence can serve as a universal language of proof – measurable, reproducible, and independent of proprietary modelling tools. Lessons from early deployment Early deployments have yielded practical lessons on how tracer data enhances both verification and interpretation. Tracerco’s first US deployment of tracer technology in a dedicated CCS project demonstrated how these systems translate theory into practice. The project confirmed the practicality of continuous tracer monitoring under real-world conditions. Detection sensitivity enabled rapid corrective action when minor anomalies were identified, and the real-time data offered insights that conventional monitoring had not revealed.

tracers provide unequivocal confirmation of containment, they help satisfy the need for ‘reasonable assurance’ stipulated by the Internal Revenue Service and EPA. In this way, they contribute to both environmental integrity and economic validation. Equally significant is the role tracers play in early leak detection. Even in well-characterised reservoirs, small migration pathways can exist through faults or legacy wells. Tracers act as a first line of evidence, alerting operators to potential movement long before it registers in pressure, temperature, or seismic readings. If detected in monitoring wells beyond the defined storage boundary, the tracer signature provides immediate confirmation that injected CO₂, and not a natural source, is responsible. The same chemistry that aids regulatory compliance also underpins public assurance. The greatest environmental concern associated with underground CO₂ storage is not atmospheric release but the potential for contamination of groundwater. Tracer monitoring helps verify that storage operations are not affecting these subsurface water systems. By confirming the absence of tracer signals in surrounding water samples, operators