Where Measurement, Emissions, and Infrastructure Decisions Determine Revenue and Risk

In energy operations, small inaccuracies create large consequences. A marginal error in measurement distorts revenue. Unquantified emissions create regulatory exposure. Underperforming infrastructure erodes asset value. These are not reporting issues. They are technical and commercial risks. Fleissen & Company advises operators, regulators, and investors on problems where accuracy, compliance, and system performance directly impact financial outcomes. We combine field engineering, data validation, and strategic advisory to deliver solutions that stand up to operational reality and regulatory scrutiny.
Who We Are

We operate at the intersection of engineering accuracy and commercial consequence.

Fleissen & Company is an energy infrastructure advisory and technical services firm specialising in hydrocarbon measurement, emissions management, and system performance. Our work supports operators, regulators, and investors in addressing complex challenges across the energy value chain,  from wellhead to terminal, from field measurement to regulatory filing.

Our Reach & Impact

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Years of specialist energy advisory practice
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Technical training programmes delivered
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Active regulatory permits

Our Services

Four practice areas. One standard: solutions that stand up under scrutiny.

 

Every service Fleissen provides is anchored in a specific category of operational or commercial risk. We do not offer broad advisory across every engineering discipline. We go deep in the areas where accuracy has the largest financial and regulatory consequence.

Where measurement is wrong, revenue is wrong. We diagnose uncertainty, audit systems, and restore confidence in production and allocation data.

GHG Emissions & Decarbonisation

Emissions are now regulated, priced, and scrutinised. We quantify emissions using defensible methodologies and design reduction strategies aligned with regulatory requirements.

Training & Capacity Building

Workshops and seminars designed to strengthen professional skills and develop industry-ready expertise.

Gas & Energy Infrastructure

Infrastructure inefficiencies destroy value. We evaluate and optimise gas utilisation, processing systems, and transportation infrastructure.

Industries We Serve

Innovative Solutions Across Industries

We partner with organizations in energy, environment, and infrastructure, providing tailored strategies that drive efficiency, sustainability, and long-term growth.

Fleissen Courses

Building Skills for a Smarter Future

Our training and capacity-building programs empower professionals with practical knowledge in energy, oil & gas, sustainability, and infrastructure management.

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Practical Relevance

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Participant Satisfaction

Professionals rate our programs highly effective and impactful.

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Skill Improvement

Attendees report stronger technical and management skills.

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Workplace Application

Graduates successfully apply what they learn on the job.

Public available Information on Our GHG Validation & Verification Activities

ICAO-CORSIA Validation and Verification Services (Accreditation in Progress)
Fleissen & Company Limited is currently undergoing accreditation as a Validation and Verification Body (VVB) for aviation emissions under the ICAO Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), in accordance with Annex 16, Volume IV, ISO/IEC 17029, ISO 14065, and ISO 14064-3.Upon completion of accreditation, Fleissen & Company will provide independent verification of aeroplane operators’ annual CO₂ emissions reports, applying a risk-based approach, reasonable level of assurance, and strict impartiality and independence requirements.Fleissen & Company maintains documented systems for impartiality management, competence assurance, complaints and appeals handling, and operates in alignment with international and national regulatory expectations. Information on our accreditation status and services is available upon request.

Clients

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