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About us

Changing the
game of solar

Sun Investment Group (SIG) is a development and investment management company, focused on delivering steady quality in the rapidly evolving solar energy industry.

Our reach

Solar opportunities
are boundless

In-house experts
150 MW
Constructed in the United Kingdom, Poland, Lithuania
6 offices
2 in Poland, 2 in Lithuania, 1 in Italy and 1 in Germany
Our focus

We focus on the following key markets

  • Poland
  • Lithuania
  • Spain
  • Italy
  • Germany

And we have the following core business divisions:

  • Utility Scale project development & operation.
  • C&I PPA project development & operation.
  • EPCm (construction management) for in-house projects only.

Together SIG and its companies form one of the most dynamic company groups dedicated to solar PV technology in Europe, led by the founders with over 10 years of experience in the market.

Business model

  • Utility
  • Commercial


Development, greenfield development and design, securing connections, permitting and PPA greenfield development.


Structuring and sourcing project finance.


EPC management, using SIG's experience and warranty strength with trusted networks of contractors.

Project development

Feasibility study – technical, economic and legal analysis; development.

Design and construction

Turnkey solution (EPC) – formalities, design and construction.


Tailored financial solutions.

Operation and Maintenance (O&M)

Optimisation, 24/7 monitoring, maintenance, insurance and guarantees.
The opportunity
The approach
The gain
Our philosophy

The opportunity

Our focus is on plants in regions whose political stability, legal framework, and existing energy and environmental policies guarantee a stable source of revenue in the long term.


Dynamic, ambitious, experienced

Established in 2017, SIG team currently unites over a 170 of in-house international experts with a broad and proven experience in diverse areas of the solar energy business, particularly in the project development, financial structuring, legal, and EPCm. The team holds a track record of 150 MW PV projects development, construction and commissioning.

Deividas Varabauskas

Chairman of the Board

Founder of SIG, working in the solar sector since 2007. Deividas is in charge of strategic planning at SIG. His main focus is on investment product creation, where the detailed understanding of project risks and the needs of investors are fundamental.

Andrius Terskovas

Board member

In the solar business since 2014, Andrius is responsible for the development of new partnerships and project origination at SIG. He holds a track record of managing the €30 million business of a Fortune 100 company and has graduated from Aarhus University with an MSc in Engineering.

Domas Kačinskas

Board Member

Highly skilled investment, development, and management professional with 20 years of experience. For the last years, Domas was CEO of Investment Funds management company. He successfully executed hands-on transactions in the Baltics and Europe, including over €1,5 B in the financing, real estate, private equity acquisitions and divestments, greenfield development of the commercial real estate, and renewable energy projects.

Management team

Rytis Jezepčikas

Global CFO

Felix Jetter

Head of EPC

Lina Žolynė

Global Chief Legal Officer

Torsten Mell

Global Head of Human Resources

Krzysztof Kadłubowski

Director Warsaw office

Giuseppe D‘Elia

Development Director Italy

Benedikt Peters

Head of Procurement

Andrius Džiaugys

Global Head of Sales, Country manager in Lithuania

Robert Pfatischer

Head of Engineering & Construction

Gediminas Januškevičius

Head of Analysis and Control Unit


Stronger together

SIG is part of a company group that unites the most ambitious and experienced solar experts in Europe.

Eternia Solar

Eternia Solar is one of the biggest solar engineering, procurement, and construction providers in the Baltics. The company works closely with international investors and clients from the manufacturing, logistics, retail, real estate, agriculture, private sectors to guarantee long-term effectiveness and efficient operation.

Visit website
Eternia Services

Eternia Services provides comprehensive engineering services: primarily design, yield assessment, executive design, as-built documentation. The team of professionals takes care of revamping systems to optimize yields, construction supervision on behalf of investors, and providing the highest quality operations and maintenance services to ensure the highest availability.

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