About Opra

OPRA Turbines develops, manufactures and services state of-the-art gas turbine systems, and is headquartered in Hengelo, The Netherlands. Our advanced turbine technology has turned the OP16 Gas Turbine into a masterpiece of technology allowing us to serve  global markets with clean, distributed energy solutions. Setting the standard in terms of availability, reliability and low maintenance costs, OP16 Gas Turbines allow for very cost-effective ‘always-on’ generation of electricity and heat. Thanks to its unique combustion technology, OP16 Gas Turbines can even turn dirty fuel gas that would otherwise be flared, vented, or simply wasted into green power and clean exhaust gas. We are convinced that OPRA Turbines’ gas turbine systems will continue to be a structural component of tomorrow’s green energy landscape, and drive the world’s energy transition!



We focus on delivering world-class quality and reliability. Aiming for First-Time-Right, excellence is a key part of our company culture enabling us to consistently meet our customers’ requirements.

Customer Focus

Our customers come first. We strive to establish open communication and flexible service. This supports us in building long-lasting and trusting relationships with our customers.

Pride and ownership

Passionate leadership and initiative with positive attitude yield the required accountability. We encourage initiative and are proud to take responsibility and leadership in our work.

Team Spirit

Together we are better. We work as one team with a common goal of satisfying our customer’s needs. Maintaining a positive and collaborative attitude contributes to our stimulating work environment.


We create solutions for today’s and tomorrow’s energy demands. Designing beyond imagination, creativity and thinking outside the box empowers our employees to deliver world-class technology.

OPRA's Story

The history of OPRA Turbines

OPRA Turbines was founded by Jan and Hiroko Mowill in 1991. Jan Mowill had previously led the gas turbine division at a major Norwegian industrial conglomerate where he developed and commercialized the world’s first radial gas turbine engine for industrial applications in 1964. Upon the establishment of OPRA (Optimal Radial Turbine), Jan and his team worked tirelessly to develop and engineer the OP16 Gas Turbine. By 1994 the original ultra low-emission combustor was already developed and patented as a result of successful testing. By 2003 the low-emission can combustion development had started.

After a successful demonstration of the OP16 Package in RuhrGas (Dorsten, Germany), OPRA Turbines sold its first commercialized OP16 Gas Turbine Package in 2005. OPRA Turbines continues to drive the world’s energy transition with over 140 gas turbine generator sets world-wide, accumulating over 2 million operating hours. Since August 2017, OPRA Turbines has since opened a new state-of-the-art headquarter facility in Hengelo (NL) to further strengthen and increase production and testing capacity following recent growth in business, paving their way to becoming the leading provider of clean gas turbines for distributed energy solutions.

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OPRA's Mission:
To drive the world’s energy transition

Management team

Guiding OPRA Turbines to a successful future

Juha van Riet CEO

Together with the management team, Juha is developing and implementing the company’s growth strategies and ensuring operational excellence.

Previously having worked at Siemens, Woodward and Stork, Juha has more than 20 years of experience in global commercial and business leadership roles as a service/solution provider and key system supplier to the energy, oil & gas and industry sector. Juha is a Belgian national and holds an MSc degree in Electromechanical Engineering and a postgraduate degree in Business Administration.

Dr. Lars-Uno Axelsson Director R&D

Lars-Uno oversees OPRA’s engineering and R&D activities related to gas turbines and packages.

Lars has more than 15 years of experience in gas turbine technology and has held positions in the fields of aerodynamics, performance and combustion. He has 2 patents on gas turbine combustion technology to his name and has authored more than 20 technical publications on gas turbine technology. Lars-Uno holds an MSc and PhD from Chalmers University of Technology, Sweden.

Toby Boys Director Sales & Marketing

Toby leads OPRA’s sales and marketing team to market and grow OPRA’s brand worldwide.

Toby has previously worked in senior sales management positions for Centrax Gas Turbines in close collaboration with both Siemens and Rolls Royce covering small and medium sized gas turbines in both the industrial and oil and gas sectors. With over 20 years’ experience in the gas turbine industry Toby brings extensive experience of the industrial gas turbine business to OPRA’s team.

Hilbert Elsinga Director Aftermarket & Service

Hilbert leads a dynamic aftermarket and service team striving to achieve customer satisfaction.

With more than 20 years experience, Hilbert’s knowledge of OPRA’s product and his in-depth experience in customer service helps OPRA to understand customer needs leading to fast and effective assessment of service situations. Previous roles have positioned Hilbert well to stimulate a service-oriented work environment with an emphasis on quality, accountability and teamwork.

Maarten Kuyck Director New Build

Maarten is leading OPRA’s operational excellence based New Build organization responsible for the execution of projects and continuous improvement.

Previously having worked in the defense industry at Thales NL and in the Cooling Fan industry at Howden NL, Maarten has gained over 30 years of experience in operations & supply chain leadership roles as a reliable provider of high quality products compliant with customer needs. Maarten holds an Ingenieur degree in Technical Business Engineering and a postgraduate Master degree in Information Management.

Robbie Greving Manager Finance & Administration

Robbie is responsible for the financial accounting of all OPRA entities.

Robbie holds a post-bachelor degree in Finance as Qualified Controller and has a broad knowledge of consolidation, project accounting and financial reporting in general to both internal and external parties. Robbie participated in the due diligence team at the time Energas acquired OPRA and continues to drive the integration of OPRA within the Energas company structure.

Frank Sanders Director Product Management

Frank leads the product management team responsible for designing the business strategy for OPRA products and services throughout their lifecycle.

Frank has worked with Rolls-Royce, starting his career in the gas turbine industry selling controls systems and services for turbines, recips, compressors and generators. Moving to Ansaldo Thomassen, Frank was responsible for service sales for GE and Siemens heavy duty gas turbine installations. Frank has a degree in Industrial Engineering and Management. Frank is currently a member of the board of the Dutch Gas Turbine Association and the board of the High Tech Systems Park in Hengelo, The Netherlands.

Monique Kollenhof Manager QHSE

Monique is responsible guiding and driving the continuous improvement of the OPRA organization.

For over 20 years, Monique has managed multiple complex international and multidisciplinary EU projects with a focus on quality, innovation and training development. Monique is one of the authors of the “Working in the Automotive Industry” book series. Monique’s background ensures a pragmatic and process-oriented approach in defining, monitoring and improving processes as well as aligning interdepartmental targets, making customer and employee feedback part of the production processes, and using KPIs to manage the OPRA organization.

OPRA's Vision:
To be the leading provider of clean gas turbines for distributed energy solutions


ISO 9001:2015

OPRA’s quality management system is focused on the development, assembly and servicing of gas turbine generator packages. Our quality management system helps us to improve our overall performance and provides a sound basis for sustainable development initiatives, consistently providing products and services that meet our customers statutory and regulatory requirements.


The DNV certifications are type approvals for specific products and allow OPRA the install and use these products in different field applications like onshore, offshore, and marine.


The German Association of Energy and Water Industries certified OPRA Turbines for grid interconnection of new installations within Germany. This is a mandatory certificate for grid integration of an installation in Germany.


Join our team of innovative and passionate people delivering a customer-driven solution