Leadership Teams

Tove was appointed Head of Offshore Wind in 2022 and holds responsibility for the Offshore Wind center of excellence including development, projects, partnerships and technology.

Her appointment follows the integration of Aker Offshore Wind where she held the role of Chief Operating Officer. Tove joined Aker Offshore Wind in 2021 and has extensive global leadership experience. Her previous leadership experience at Aker includes roles such as Executive Vice President, Country Manager, Chief Communication Officer as well as leading large transformation projects in Aker Solutions.

In addition, she has held several other leadership roles within project management, manufacturing, and engineering. Through her over 25 years of experience in the energy industry, Ms. Røskaft has demonstrated the ability to inspire and motivate teams to deliver high performance and results.

Ms. Røskaft holds a M.Sc. in Marine Hydrodynamics from NTNU, the Norwegian University of Science and Technology.

Aidan Guinan was appointed to the role of Chief Financial Officer, Offshore in March 2023 having led the merger and integration of Aker Offshore Wind into Mainstream in 2022.

Aidan has held several positions in Mainstream since he joined in 2014 most recently as Group Head of Investment Risk, Legal and Governance where he was responsible for reviewing new investment opportunities, assessing capital allocation and diversification of risk across the group. Prior to that Aidan was Group Head of Commercial supporting the regions in commercial and project finance transactions and Project Director where he led the disposal of Mainstream’s Neart na Gaoithe 450 MW offshore wind project to EDF in 2018.

Prior to joining Mainstream, Aidan worked for an Irish infrastructure developer where he led numerous M&A transactions and raised over US $1.25bn of project finance debt for two toll road PPP transactions in Ireland. Aidan trained with PwC Ireland and is a Fellow of the Institute of Chartered Accountants in Ireland.

Geir Olav Berg is responsible for engineering and technology at the Mainstream Renewable Power Offshore Platform. He has over 30 years of experience in the offshore industry including Engineering Manager for Aker Solutions floating wind department. Geir Olav has held several management positions within subsea technology and project management at various Aker Solutions companies. Geir Olav has a passion for the opportunities presented renewables in combination with offshore technology. He holds a MSc in Marine Technology from the Norwegian University of Science and Technology (NTNU) with specialization in Naval Architecture, Cybernetics and Robotics.

Sebastian Bringsværd heads up the Norway region in Mainstream and is responsible for developing the Norwegian market, including our two bids for floating offshore wind at Utsira Nord and bottom-fixed offshore wind at Sørlige Nordsjø II.

Previously, Mr. Bringsværd worked at Equinor, where he was a member of the senior management team and where he built up the New Energy Division over the course of six years. In his previous position, he was responsible for establishing and heading up the floating wind unit which covered commercialization, deployment, and industrialization of floating wind in existing and new markets. He has held many leadership roles throughout his career and joined Aker Offshore Wind in November 2022. Mr. Bringsværd holds an MBA from Lancaster University, UK, and a law degree from the University of Oslo, Norway.

In a career spanning over 30 years Sian has extensive business experience as a Senior Leader in both Energy and IT industries, having held several leadership roles in both blue chip and start-up Companies.

Since starting her career in the Halliburton Corporation focused on North Sea and Africa, Sian has held senior positions in Oracle Corporation managing a global accounts division, was the UK MD of Aker Solutions Ltd and is currently the UK Managing Director of Mainstream Renewable Power, an Aker Company and a floating wind developer. She considers that building on the capability, solutions, and industrial heritage in the UK from oil and gas will support the scale and pace needed to deliver affordable clean energy from offshore floating wind.

Sian sits on the Boards of Serica Energy plc, Offshore Energy UK (OEUK) as co-chair and participates in other industry boards. She is also the industry Supply Chain Champion, on behalf of the UK Government and OEUK, supporting delivery of the £16billion North Sea Transition Deal.

Holger is in his position since 2021 and has responsibility for MRPs offshore wind development activities in Europe (outside Norway, UK and Ireland) and selected global markets.

Previous career steps included Offshore wind development and construction projects in Europe and Oil and gas exploration and production activities globally.

Holger is a trained geologist with a French engineering degree and an executive MBA. He is engaged in several non-executive board positions in industry associations.

Caroline has the position as Offshore Project Management Office (PMO) Manager and has the overall responsibility for the project management and control function in the offshore wind division of Mainstream.

Caroline came from Aker Offshore Wind after the company combined with Mainstream in 2022. Before Aker Offshore Wind, Caroline spent 23 years in Aker Solutions in various roles. Caroline has experience from larger development projects in the oil and gas industry where she held several types of project management and control positions and was part of the project management teams with responsibility for project controls and business management.
Caroline holds a M.Sc. in Mechanical Engineering from the Department of Production and Quality Engineering at the Norwegian University of Science and Technology (NTNU).

Euan joined Mainstream as Head of Offshore Legal in January 2022. As a member of the Leadership Team he is first point of contact to provide legal and commercial advice on offshore investments, M&A, private equity, fundraisings and structuring at project and corporate level. His main focus has been to support bid and project teams globally.

Euan has experience in the construction & engineering and oil & gas sectors in legal leadership roles.

He has a law degree from Strathclyde University and is an accredited Mediator.

Phoebe has a degree in human resources from BI Norwegian Business School and has more than 20 years of experience within the HR field across various sectors. She grew up living in different parts of the world and is curious about what drives people and what it takes to succeed. Phoebe is an outdoorsy person and love the four seasons.

Geir Ove Karlsen heads up Offshore Corporate Affairs in Mainstream Renewable Power. He has extensive leadership experience from roles as Managing Director at Benestad Solutions (an Aker Solutions’ Company) and leadership roles in Aker Offshore Wind. He represents MRP on several industry committees on offshore wind and renewable energy. Geir Ove holds a M.Sc. in Business and Economics from BI Norwegian Business School and an MBA in Strategic Management from NHH Norwegian School of Economics.