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.
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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 
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.
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Measurement & Revenue Assurance
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 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
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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.
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.
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.
