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Innovations to optimise geothermal utilisation and economics

Webinars 06 October 2021

Geothermal resources are naturally aggressive environments that can threaten the integrity of critical components of the geothermal power plants. Materials’ challenges such as silica scaling and corrosion damages due to continuous contact of the plant parts with the corrosive chemical species in the geothermal fluids cause lower plant efficiency and cost implications making the industry less lucrative for investors challenged by concerns on reduced return on assets.

Project GeoHex (, funded by European Union's Horizon 2020 research and innovation programme (Grant agreement 851917), offers innovative solutions to the current challenges, demonstrating techno-economic and environmental feasibility. Relying on low cost carbon steel as base material for heat exchangers (HX) with surface modifications, GeoHex aims to significantly improve the heat transfer performance and sustainability of HX thereby reducing the overall CAPEX and OPEX of geothermal plants.

The workshop will include talks from our partners on the challenges with HX in Iceland, the evolution of geothermal energy in the Philippines and how projects like GeoHex help address the current issues with the geothermal energy.


  • Heat exchangers and their challenges in Icelandic environment
  • Geothermal energy in the Philippines
  • Enhancement of heat exchanger performance through the utilisation of coatings

Sustainable Energy Week

 This event is a Sustainable Energy Day workshop under the EU Sustainable Energy Week (EUSEW) 2021.

It is one of the many initiatives promoting clean energy across Europe throughout September and October in conjunction with the EUSEW programme.

Visit the EUSEW website to sign up to the mailing list to be kept up to date with the latest news and developments about #EUSEW2021, which takes place from 25-29 October, bringing together leading figures in green energy from across the continent.


This project has received funding from the European Union's Horizon 2020 research and innovation programme. Grant agreement 851917.


John S. Defensor - President

John S. Defensor

Quantum Leap JMB Mktg Inc

John S. Defensor is the President of Quantum Leap JMB Mktg Inc (QLM). QLM is corporation that started as a “supply and delivery” of various products in Central Luzon. Over the years, the company has evolved to providing other services such as helping the Philippine government with training and research. It is currently working with the Philippine National Oil Company-Renewable Corporation, a government owned corporation to help in developing Geo Thermal plants in the Philippines. John has been working at QLM since 2016 establishing new product lines and market for the company. He has also collaborated with TWI, EU and the Philippine government through PNOC-RC to develop new technology and materials to improve Geo thermal plant efficiencies in the country.

Kolbrún Ragna Ragnarsdóttir - Senior Project Manager

Kolbrún Ragna Ragnarsdóttir

Senior Project Manager
ON - Orka náttúrunnar / ON Power

Kolbrún Ragna Ragnarsdóttir is a Senior Project Manager in R&D at ON Power, one of the largest geothermal power companies in the world.

She received her M.Sc. degree from the Faculty of Mechanical Engineering at the University of Iceland in the field of geothermal corrosion (2013). Her expertise lies within mechanical engineering, geothermal energy, corrosion of metals in difficult environments and borehole technologies for deep geothermal wells (for example IDDP). She has been working in geothermal R&D for over a decade, received both international and national grants, and has contributed to numerous peer reviewed articles. Her focus has been on working towards a better connection between industry and academia in numerous research collaborations.

She has been an active member of the geothermal and energy community in Iceland. This includes co-founding a company in 2014 and receiving funding from Startup Energy Reykjavik, being a board member of the Renewable Energy Cluster ( -  an association of energy and energy-related companies in Iceland - and member of the board of Women in Energy group that supports equality in the energy sector in Iceland.

Imran Bhamji - Project Leader, Stainless Steel & Non-Ferrous Alloys section

Imran Bhamji

Project Leader, Stainless Steel & Non-Ferrous Alloys section

Imran graduated from the University of Manchester in 2007 with a master’s degree in Materials Science and Engineering and then completed an EngD, also at the University of Manchester, sponsored by TWI Ltd, in 2012. The focus of his EngD thesis was on the development of the linear friction welding process for the welding of stainless steels and dissimilar materials: aluminium-copper and aluminium-magnesium. Prior to joining TWI, he had a number of academic roles at the Open University and the University of Manchester investigating cracking in power plant steels and corrosion mitigation of nuclear fuel rods. Imran has expertise in residual stress characterisation, x-ray diffraction (XRD), electron back-scatter diffraction (EBSD) and digital image correlation (DIC). He joined TWI in January 2017 and assists TWI's Industrial Members with failure investigations and materials characterisation involving stainless steels and non-ferrous alloys.

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