Associated European Energy Consultants

“Delivering European Energy Solutions”

Associated European Energy Consultants

“Delivering European Energy Solutions”

Member Infomations


Oslo, Svalbard (Longyearbyen)

Advokatfirmaet Haavind AS

Bygdøy allé 2
0101 Oslo
+ 47 22 43 30 00
+ 47 22 43 30 01
Contact person for AEEC matters:

Aksel Tannum


Real Estate / Energy

Aksel S. Tannum specializes in Renewable Energy/regulatory issues and Litigation. He is Partner and head of Haavind’s Energy department, as well as a member of the Litigation department.

Key qualifications:
Tannum has worked with the energy sector since 2000, when he was an employee at the Department of Energy law at the Ministry of Petroleum and Energy. He worked in the Ministry until 2005 and was, amongst other things, involved in several central legislative processes. In addition to trade and industry knowledge, his employment at the Ministry has given Tannum important insight into the Ministry’s decision-making processes and a network of contacts, both in the Ministry and at The Norwegian Water Resources and Energy Directorate. Tannum was employed at Haavind in 2005, and has mainly worked with counselling and litigation for the Energy industry.
Tannum has wide experience with legal counselling and dispute resolution, including the Supreme Court, within the renewable Energy sector. He has inter alia comprehensive experience with legal issues regarding grid operations, power generation (hydro and wind power), electricity trading and district heating.

Work experience:

  • Partner, Advokatfirmaet Haavind                           (2013 – )


  • Associated partner, Advokatfirmaet Haavind         (2011 – 2013)


  • Associate/Senior associate,
    Advokatfirmaet Haavind                                    (2005 – 2011)


  • Counsellor at judicial section,
    Ministry of Petroleum and Energy                     (2000 – 2005)


  • Legal secretary, Hjemfallsutvalget                    (NOU 2004:26)



  • University of Bergen                              (2000)




  • Co-author of Gyldendal Rettsdata’s commentary on the Energy law,
  • Block, Guy Renewable Energies, Interlaw 2015 – Norway




  • Member of the Norwegian Bar Association
  • Former representative to the Norwegian Bar Association.
  • Former member of Juristenes Utdanningssenters expert committee for energy law


International rankings:


Tannum is ranked among the leading Energy lawyers by renowned institutions like Chambers & Partners og Legal 500.


From Legal500 recent years:


«Aksel S. Tannum is an energy market specialist with enviable industry knowledge»


«Within Electricity, nuclear and renewable, Haavind AS, Advokatfirmaet is a first tier firm… and Aksel Tannum recently advised Foreningen til Bægnavasdragets regulering on revising conditions for concessions in Åbjøra and Aurdalsfjord.»


From Chambers & Partners recent years:


«Aksel S. Tannum is definitely a practitioner to watch»


«According to peers, younger lawyer Aksel Tannum is “one to watch – he definitely has lots of potential.” He receives glowing praise from clients, who appreciate that “he delivers according to his promises, communicates well, and is very available and easy to work with.” Tannum’s background at the Ministry of Petroleum and Energy means that he has strong regulatory knowledge and a good relationship with the relevant authorities.»


«Practice head Aksel Tannum previously worked at the Ministry of Petroleum & Energy, and the knowledge and experience he can bring from this time is appreciated by clients. Sources also praise his strategic thinking.»

Mari Reitzel Bjerke

Senior Lawyer

Energy, Construction, Litigation

Key qualifications:

Mari specialises in Renewable Energy, Contract law/Construction law and Litigation, and has ten years’ experience as adviser to players within the renewable energy sector.


She advises on issues related to hydroelectric power production, district heating, grid development and wind power, especially related to regulatory issues and constraints, contractual matters, concession issues, establishment and development of power production, energy related transactions, acquisition of waterfall and land rights, government requirements and appraisement. She has extensive experience with complex energy transactions, especially within hydro power and wind power, as adviser to both seller side and buyer side.

Mari also has extensive litigation experience, and significant construction law competence, especially from working with the development of power production facilities within hydro power and wind power. In 2017, she was appointed Next Generation Lawyer within the category Electricity and Renewable Energy by Legal 500

Work experience:

  • Lawyer/senior lawyer, Haavind                               (2013 –   )


  • Deputy judge, Follo District Court                                     (2013)


  • Counsellor, EMAS AMC (project based)                           (2012)


  • Associate/lawyer, Advokatfirmaet Haavind             (2007 – 2012)



    • jur., University of Oslo  (2007)


    • License to practice law   (2010)



International rankings:

  • Appointed Next Generation Lawyer within the category Electricity and Renewable Energy by Legal 500 (2017)


  • Block, Guy Renewable Energies, Interlaw 2015 – Norway


  • Member of The Norwegian Bar Association and The Norwegian Association of Lawyers.


Advokatfirmaet Haavind AS

Haavind is one of Norway’s leading law firms. The firm is located in central Oslo and provides legal services to businesses, covering all aspects of commercial law. Haavind is a full-service law firm with several of the largest companies in Norway, as well as public sector, as clients.

Our goal is to create added value for our customers by offering legal advice of the highest quality combined with comprehensive industry knowledge. That is why we organise our teams by sector and specialisation.

Oslo, Svalbard (Longyearbyen)
Accredited professionals
Dedicated departments in the field of energy
Banking and finance Construction and offshore Corporate M&A Dispute resolution Employment and pension Energy EU/EEA and competition Food Insolvency and restructuring Intellectual property rights Information technology Media Privacy Property development Property transactions Public procurement Stock exchange and capital markets Taxes and duties
Accredited professionals active in the field of energy
Other departments
Banking and finance, Construction and offshore, Corporate M&A, Dispute resolution, Employment and pension, EU/EEA and competition, Food, Insolvency and restructuring, Intellectual property rights, Information technology, Media, Privacy, Property development, Property transactions, Public procurement, Stock exchange and capital markets, Taxes and duties
Statkraft, Statnett (Norwegian TSO), Skagerak, Helgeland Kraft, Vattenfall, Axpo, Salten Kraftsamband etc.
Our team of legal and industry experts is one of the strongest in Norway, giving legal and strategic advice to all areas of the energy sector. The lawyers have experience from the industry, as lawyers and from working at the Ministry of Oil and Energy. In addition we are considered among the most experienced law firms within dispute resolution, counselling for five out of seven of the most important energy cases in the Supreme Court since 2010.
Selection of references
References upon inquiry

Publications of Advokatfirmaet Haavind AS

The AEEC member has no publications yet.