Executive Summary

Nubo Sphere is a continuous monitoring solution for methane emissions. In this test campaign at Colorado State University’s Methane Emissions Technology Evaluation Center (METEC), a university test site simulating conditions of upstream gas wells, we evaluated its ability to detect, locate and quantify methane emissions from different equipment types under changing environmental conditions.

During a 9-day test campaign featuring 27 controlled releases with methane emission rates between 0.6 and 7.7 kg per hour, Nubo Sphere successfully detected 100 % of the emissions under realistic wind conditions.
There were no false positive detections of emission events, or in other words, no cases where a detection was signaled that did not correspond to an actual controlled release event.
The quantified emission error was as low as 2 %, i.e. the total reported amount of emitted methane was very close to the actual emitted amount under favorable wind conditions. Such favorable wind conditions occur on sites regularly throughout the day.
Time to detection was approximately 30 minutes, with confirmed detection alerts being sent after 2.5 hours on average.
Emission sources were localized within a radius of 4 m around the true source.

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