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.

Fleissen Training

Specialist training delivered by practitioners.

Fleissen delivers specialist technical training and professional development programmes for the energy sector, designed and facilitated by practitioners with direct field and regulatory experience, not generic trainers

Public available Information on Our GHG Validation & Verification Activities

Impartiality policy

Fleissen & Company Limited carries out validation and verification impartially. Our conclusions are based on evidence alone, and our fees never depend on the outcome.

We shall not validate or verify any claim made by a client to whom we have provided consultancy on that claim, or on the data, methods or targets behind it, within the previous three years. No person who provided such consultancy takes part in verifying for that client.

Our impartiality is overseen by an Impartiality and Independence Committee with external members.

Complaints and Appeals

  • Anyone may raise a complaint. A client may appeal against any validation or verification decision.
  • Send it in writing to m.tom@fleissen.com, or to the Internal Quality Manager, Fleissen & Company Limited, C1 Right Wing, First Floor, Abia House, Central Business District, Abuja.
  • We acknowledge receipt within 5 working days and give a written decision within 30 days.
  • Every complaint and appeal is decided by people not involved in the matter.
  • The process is free, confidential and carries no penalty for the person raising it.

three years. No person who provided such consultancy takes part in verifying for that client.

Our impartiality is overseen by an Impartiality and Independence Committee with external members.

Clients

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News & Insight

Fleissen publishes Energy Summaries, a monthly intelligence report covering Nigeria's energy sector, alongside technical briefs and industry analysis. Subscribe below to receive each edition.