Our Team
Europe

Torsten Schwab
Director
Torsten Schwab
Director
Based in Berlin, Germany
Torsten Schwab is the coordinator of the “PtX Hub”. The last years, he managed the IKI-project “Climate Neutral Alternative Fuels” in Brazil – BMU’s first PtX project within the PtX Action Program. He has been with GIZ since 2004, promoting the use of renewable energies, first in rural electrification, then in energy planning for specific technologies (solar, wind, bioX), and lately renewables as a source for clean aviation fuels. He holds MSc degrees in both Engineering Cybernetics and WASTE („Water, Air, and Solid Waste Treatment Engineering“), both from the University of Stuttgart.

Carolin Capone
Director
Carolin Capone
Director
Based in Berlin, Germany
Since March 2021 I have led PtX Hub activities, focusing on cooperation with our partner countries: Argentina, South Africa and Morocco. I have worked in different positions in and outside of GIZ, mostly in research and consulting on clean transport and renewable energy. For the last three years, I was responsible for the GIZ‘s clean transport projects in Thailand and in the ASEAN region.
I studied Environmental Engineering and Environmental Resource Management at the Brandenburg Technical University in Cottbus and Saitama University in Japan, and have since worked in Thailand, Japan, Colombia and Peru.

Frank Mischler
Director
Frank Mischler
Director
Based in Brussels, Belgium
We are entering the decisive decade to mitigate the harshest effects of climate change and – so my conviction – we will only be able to manage if hydrogen and PtX from renewable energy sources play an important role. I am leading the Brussels Team of the PtX Hub, follow policies and regulations of the European Union closely and their implications for developing and emerging countries. I am concerned with building a global system that allows for frictionless trade in renewable hydrogen and derivatives, with a particular focus on setting up a book & claim system for sustainable aviation fuels.
Before joining the PtX Hub, I supported the European Union’s climate diplomacy efforts with G20 countries.

Charlotte Hussy
Lead Country Activities
Charlotte Hussy
Lead Country Activities
Based in Berlin, Germany
I am a project manager within the PtX Hub and coordinate the country activities. We promote sustainable PtX production, advise on regulatory frameworks and certification, organise workshops, implement trainings and conduct scoping studies in our 12 partner countries: Argentina, South Africa, Morocco, Kenya, India, Vietnam, Uruguay, Colombia, Namibia, Algeria, Jordan and Egypt. Before joining GIZ, I worked for five years as a Senior Consultant for Energy Systems and Markets at Guidehouse and at the Electric Power Research Institute in Palo Alto (USA).

Maren Schöttler
Communications
Maren Schöttler
Communication
Based in Berlin, Germany
Prior to starting in the PtX Hub, I worked for the GIZ in fostering collaboration between the private sector, political actors and researchers to create sustainable business models addressing developmental challenges. Before that, I supported the energy dialogues between the German Ministry of Economic Affairs and Energy and partner countries at adelphi consult in Berlin.

Nora Ziegler
Communications
Nora Ziegler
Communication
Based in Bonn, Germany

Heino von Meyer
Sustainability & Global Relations
Heino von Meyer
Sustainability & Global Relations
Based in Berlin, Germany
I enjoy being part of the highly competent and creative start-up team of the PtX Hub. Our mission is to catalyse green hydrogen solutions on a global scale, focussing in particular on sustainability along the entire value chain. My role as Head Global Relations and Networking is to liase and partner with international institutions, initiatives, and individuals engaged in Power-to-X development advancing S4F: Sustainable fossil-free fuels and feedstocks. Prior to working with GIZ, I was a Senior Economist at the Organisation for Economic Co-operation and Development (OECD) for three decades. From 2002 to 2019, I served as Head of the OECD Berlin Centre.

Mascha Tatjana Horváth
Human Resources
Mascha Tatjana Horváth
Human Resources
Based in Berlin, Germany
Within the PtX Hub my role as the Office Manager is to support my colleagues in daily business, as well as manage team tasks, and organise our office in Berlin.
My focus is on daily assisting the PtX Hub team to fully reach their potential, based on various project goals and frameworks. I have graduated from the Berlin School of Economics in both HR & Organisations, closing this academic period with a bachelor thesis in Diversity Management – Managing Intercultural Teams.

Elmar Schuppe
Training Development
Th. Elmar Schuppe
Training Development
Based in Bonn, Germany
As I was always interested in environmental and climate protection and fascinated by related questions of how the world can adequately secure energy supplies, I have found the perfect job here at GIZ targeting comprehensive and long-term decarbonisation solutions for the whole economy. At the moment I am working to build up a secretariat for sustainable synthetic fuels, otherwise known as PtX. Before joining GIZ in 2015, I supported a renowned Indian think tank in New-Delhi and practiced energy economics both in the German energy industry and at the Institute of Energy Economics at the University of Cologne (EWI). As an economist, I am convinced that effective climate protection is not possible without putting a reasonable price on GHG emissions.

Ruth Barbosa
E-Learning
Ruth Barbosa
E-Learning
Based in Frankfurt, Germany
I joined the PtX Hub in September 2022 to support the trainings team. Before, I worked for two and a half years with GIZ Brazil. In the partner project ProQR I got in touch with the exciting topic of Power-to-X and developed academia training measures for sustainable aviation fuels (SAF).
Holding a Master Degree in Educational Leadership from University of Duisburg-Essen, I bring along didactical expertise from the language and vocational training sectors. After living and working in Poland, Italy, Canada and Brazil, I am now based in Frankfurt and excited to continue my professional journey with the PtX Hub trainings.

Elisabeth Kriegsmann
Training Organisation
Elisabeth Kriegsmann
Training Organisation
Based in Berlin, Germany
In May 2021, I joined the PtX Hub, since then I form part of the PtX trainings team. I’m holding a master’s degree in International Economics from the Berlin School of Economics and Law. During my studies I dealt with socio-economic and ecological sustainability issues and the green transition of the German automobile industry. After my graduation, I collected working experience in the UNECE prior to join the PtX Hub.
Climate change is a multi-faceted issue that all of us are facing. I believe that only a holistic approach can tackle this challenge. With Power-to-X we can transform renewable energy into a broad range of products for agriculture all the way up to cosmetics, using mostly – but not exclusively – hydrogen as a vehicle to produce these end products. The goal is to not stop here, but to also consider environmental prerequisites and social aspects of each location and hence trigger an overall improvement of the environmental, social and economic situation in the respective regions.
I am happy to have joined the PtX Hub Team and contribute to the spread of knowledge about the possibilities of Power-to-X technologies around the world while simultaneously learning a lot every day myself.

Sonia Rueda
Aviation & Chemical Industry
Sonia Rueda
Aviation & Chemical Industry
Based in Berlin, Germany

Philipp Wittrock
Shipping & Country Outreach
Philipp Wittrock
Shipping & Country Outreach
Based in Bonn, Germany
I joined the PtX Hub Berlin in May 2022, focusing on the cooperation with our partner countries Egypt and Kenia as well as advising the PtX Hub on Power-to-X in the shipping sector. I have worked in different positions in GIZ on international energy and climate topics, gained in-country experience in various countries worldwide and was senior advisor to the Managing Director at GIZ.
Sustainability is an integral part of my professional and private life, contributing to the big picture with small steps. Currently, I am completing a part-time MBA in Sustainability Management at the Centre for Sustainability Management at Leuphana University in Lüneburg.
I studied European Studies with a focus on International Studies at Maastricht University in the Netherlands and the University of Oslo in Norway, and have since lived and worked in Uganda and Georgia.

Christoph Michel
Funding & Investment
Christoph Michel
Funding & Investment
Based in Brussels, Belgium
I enjoy being part of the highly competent and creative start-up team of the PtX Hub. Our mission is to catalyse green hydrogen solutions on a global scale and focusing in particular on sustainable finance along the entire value chain with a holistic end-to-end approach.
My role as Advisor in Funding and Investments is to liaise and partner with international institutions, initiatives, financial industry and individuals engaged in financing in Power-to-X projects or R&D from end-to-end. Prior to working with GIZ, I was Senior Partner at KPMG providing global advice to the financial industry.
My educational background is financial engineering and Socially Responsible Investment Advisor (SRI-Advisor).

Jan-Hendrik Scheyl
PtX Sustainability & Certification
Jan-Hendrik Scheyl
PtX Sustainability & Certification
Based in Bonn, Germany
Defossilising various industries with PtX can effectively contribute to reaching international climate targets. The integration of PtX in supply chains across the world is a challenge that can be tackled best by cooperating on a global level with the many stakeholders involved.
As part of the Brussels Team of the PtX Hub, I engage at the intersection of certification, sustainability, and standards.
Before I joined the PtX Hub, I worked in sustainability consulting as a project manager for two years, where I advised international clients on EU regulations, developed certification concepts, and conducted greenhouse gas emission calculations for fuel supply chains.

Carla Reihle
PtX Country Potentials
Carla Reihle
PtX Country Potentials
Based in Bonn, Germany
Innovative and sustainable solutions like Power-to-X are needed to reach the international goals of defossilisation by 2050.
In October 2020, I joined the PtX Hub. As part of the Country Works team, I focus on the activities in Namibia while also working on developing a transdisciplinary scoping framework to identify countries’ bottom-up PtX narratives.
I am holding a Master’s degree in environmental management from the University of Natural Resources and Life Sciences in Vienna. Prior to joining GIZ, I collected working experience with Daimler AG by supporting the development of a fuel cell vehicle.
I am glad to be part of the PtX Hub team and contribute to the development of sustainable PtX value chains where no one is left behind.

Mascha Kuzay
Country Cooperations Chile, Colombia, Uruguay & Vietnam
Mascha Kuzay
Country Cooperations Chile, Colombia, Uruguay & Vietnam
Based in Berlin, Germany

Sun-Min Kim
Country Cooperations Algeria & India
Sun-Min Kim
Country Cooperations Algeria & India
Based in Bonn, Germany
Since joining the PtX Hub in July 2022, I focus on support activities to our partner countries Algeria and India.
Having worked on governance challenges in the extractives sector for the last five years, my personal interest lies in shaping frameworks and systems that enable countries to balance economic, social and environmental considerations when it comes to large-scale investments.
Before joining the PtX Hub, I was part of the CONNEX Initiative supporting partner countries in contract negotiations in the mining and infrastructure sector.
I studied International Security at Sciences Po Paris and have since worked in Togo, Cameroon, Guinea and the US. Currently, I am completing an LLM in Oil, Gas and Mining at the Nottingham Trent University, as part of which I explore the investment law implications linked to fossil fuel exit scenarios.

Frank Münk
Country Cooperations Argentina, Morocco & South Africa
Frank Münk
Country Cooperations Argentina, Morocco & South Africa
Based in Bonn, Germany
The global energy transition has been the driving force of my professional life from the very beginning. After studying industrial engineering, I worked as project manager in the solar energy industry, on the implementation of international PV and CSP power plants.
Since 2021 I am advisor for PtX and renewable energy at GIZ.
My current role at the International PtX Hub is to support the cooperation activities with Argentina, Morocco and South Africa aiming at the development of local PtX markets, and to advise on PtX technology and sustainability issues.

Iris Geler
Trainings Assistant
Iris Geler
Trainings Assistant
Based in Bonn, Germany
In December 2022, I joined the PtX Hub as an intern to support the trainings team.
Holding a bachelor’s degree in Educational Sciences and Education Management from the University of Freiburg, I am convinced that educational work is essential to promote critical thinking and capacity for action in the field of sustainable development. During my studies I dealt with the instructional design of learning contents for diverse learning platforms.
Therefore, I am excited to support the PtX Hub team in their mission to spread high-quality knowledge about PtX around the world.

Kathrin Langewald
Countries Assistant
Kathrin Langewald
Countries Assistant
Based in Berlin, Germany
I joined the PtX Hub in January 2023 to support the team in its work with its partner countries. My key accountabilities relate to internal and external communication, as well as support in research and analysis of relevant country specific activities.
My interest in Power-to-X solutions and emerging green hydrogen markets is shaped by its relevance for social and ecological well-being across the globe and therefore its potential for increased international cooperation.
Before joining the Hub, I had the opportunity to intern at the German Development Institute on biofuels and their contribution to the SDGs in different country contexts. This motivated me to continue working on alternative energy carriers and initiatives supporting information dissemination and exchange with relevance to sustainability, wherefore I am happy to contribute to the GIZ’s mandate in this field.

Ala Awali
Technical Assistant
Ala Awali
Technical Assistant
Based in Bonn, Germany
I believe that green hydrogen is a core pillar of the global transition towards a sustainable and carbon-neutral future, and through its smart utilisation, we can help the world we live in and the future we create for the next generations.
As an Assistant at PtX Hub in Bonn, I am glad to have the opportunity to do my master’s thesis under the supervision of the PtX Hub team on the potential of utilising PtX products and green hydrogen as a solution to the energy-water-food nexus in Jordan. I am studying for my master’s degree in environmental and renewable energy engineering at the German Jordanian University, and I am a Certified Energy Manager (CEM).
My professional background is mostly in sustainable management and operation. I am one of the authors of two guidelines books related to the SDGs, ISO standards, and the UN 10-year framework program on sustainable consumption and production.

Ignacio Delgado
PtX Sustainability & Certification Assistant
Ignacio Delgado
PtX Sustainability & Certification Assistant
Based in Bonn, Germany
Defossilisation is a key element for the success in the global combat against climate change – PtX will play a significant role in the energy transition in the coming years. New challenges will need to be tackled at a global level through dialogue and cooperation. My motivation is to contribute to the steering of these developments towards economic, social, and environmental sustainability.
As part of the Policy team of the PtX Hub, I am supporting the coordination of multilateral PtX dialogues and events as well as researching and contributing to the knowledge management of policy topics such as certification and sustainability.
I hold a B.A. in European Studies from Maastricht University as well as a M.Sc. in Public Policy and Human Development from the UNU MERIT.
South America

Claudia Ilting
Lead Argentina (Interim)
Claudia Ilting
Lead Argentina (Interim)
Based in Buenos Aires, Argentina
With its favorable conditions for renewable energy generation, Argentina has great potential to develop sustainable Power-to-X (PtX) markets, reduce import dependency, and create socio-economic benefits. In order to support this process and facilitate the dialogue among the stakeholders in the PtX market, we are working on six key areas, such as conducting a study on allocation scenarios for PtX, conducting technical studies, and organising trainings.
Prior to joining the PtX Hub, I worked as a GIZ Business Scout for Development at the German Argentine Chamber of Commerce and Industry. I have a degree in Business Administration, hold a Master’s degree in Sustainable Development/International Cooperation, and have more than 17 years of international work experience in both the private sector and development cooperation.

Veronica Chorkulak
Technical Advisor Argentina
Veronica Chorkulak
Technical Advisor Argentina
Based in Buenos Aires, Argentina
I support the development of sustainable markets for green hydrogen and PtX as fundamental pieces for Argentina’s energy transition. With our partners, we advise on the development of allocation scenarios for selected PtX products, analysing value chains and providing suggestions to improve the regulatory framework for the production, use and export of PtX products.
I am passionate about promoting sustainability in the energy sector and industry, and I love working as a team to achieve satisfactory results.
I have a Bachelor Degree in Economics, a Master Degree in Environmental Management and a specialisation in the energy sector. Before joining GIZ, I worked at multi-stakeholder initiatives to promote sustainability in supply chains, and at the Secretary of Energy analyzing energy projects from a technical, economic, environmental and regulatory perspective.

Sebastián Murúa
Technical Advisor Argentina
Sebastián Murúa
Technical Advisor Argentina
Based in Buenos Aires, Argentina
Green hydrogen and Power-to-X industries are expected to play an important role in the energy transition, enabling the defossilisation of sectors considered “hard to abate”. However, considering that it is a new field and market, there is a lot of work to be done in terms of technology development, knowledge, business, policies, and regulation.
My professional career has always been related to the energy sector. I have worked for an engineering services company in the Oil & Gas industry and a renewable energy company developing green hydrogen projects. I consider it a privilege to be able to dedicate my effort and time to working for a just energy transition.
The PtX development in Argentina is particularly interesting due to the excellent potential in clean energy, and the possible impact that this industry might have in the country.

Veronica Vukasovic
Senior Advisor Chile
Veronica Vukasovic
Senior Advisor Chile
Based in Santiago, Chile
Accelerating the energy transition by defossilising those sectors that are difficult to electrify is crucial to comply with the Paris agreement, therefore being part of this transformation through the PtX Hub motivates me.
After working for more than 15 years on the promotion of renewable energies and the development of technical and professional capacities in Chile, Argentina and Germany, I am now responsible for the implementation of the PtX Hub’s activities in Chile and Uruguay.
I have a degree in social sciences, and I am a certified project manager.

Diego Messina
Technical Advisor Chile & Uruguay
Diego Messina
Technical Advisor Chile & Uruguay
Based in Santiago de Chile, Chile
Since 2023, I joined the PtX Hub for Chile and Uruguay convinced that the green hydrogen and PtX products are crucial to defossilise end uses that are hard to electrify, and a sustainable alternative for the chemical industry.
Before joining the PtX Hub I worked for five years at the United Nations Economic Commission for Latin America and The Caribbean (ECLAC) in several interdisciplinary projects regarding themes as green hydrogen, energy analysis and policy development for climate change mitigation and adaptation. In addition, as a contributing journalist, during 2021 I published articles related to the water, mining, and energy sector in The Economist magazine.
My backgorund is in Industrial Engineering and I have a master’s degree in Sustainable Development. Last year I completed a diploma on green hydrogen at the Catholic University of Chile.

Jorge Andres Roncancio Gomez
Technical Advisor Colombia
Jorge Andres Roncancio Gomez
Technical Advisor Colombia
Based in Bogotá, Colombia
Since I joined the PtX Hub in April 2022, I have been responsible for the PtX Hub activities in Colombia. Our main strategy is focused on the development of technical studies to facilitate the establishment of PtX technologies and capacity building, involving the most relevant actors of the country.
I do believe that implementation of PtX technologies is a fundamental step to expand the hydrogen industry.
A Mechanical engineer by training, I also completed both a Masters degree in combustion, and a Masters degree in Renewable Energies.
Africa and Middle East

Matthias Rilling
Lead Morocco
Matthias Rilling
Lead Morocco
Based in Berlin, Germany
At the PtX Hub, I focus on Morocco and North Africa. I am convinced that PtX can contribute to the last mile decarbonisation of the economy and that it gives the South’s countries the opportunity to establish a lasting and sustainable industrial sector.

Alexander Mahler
Lead South Africa
Alexander Mahler
Lead South Africa
Based in Pretoria, South Africa
I lead the country component South Africa and advise on synthetic fuels in the PtX Hub. The Hub’s main goal is to catalyse defossilised economies globally. It is funded by the German Ministry for the Environment, Nature Conservation and Nuclear Safety and implemented by the GIZ.
Before joining GIZ, I was the Deputy Managing Director and Head of Transport Policy at Green Budget Germany, a German environmental think tank, where I focused on economic instruments in air and road transport.

Johannes Arndt
Advisor South Africa
Johannes Arndt
Advisor South Africa
Based in Pretoria, South Africa
PtX technologies hold immense promise in bolstering stable, reliable and defossilised energy systems – qualities that we experience at their limits here in South Africa – day in, day out.
As an economist with a focus on energy- and regulatory economics, my passion are questions on how to create enabling environments to decarbonise our economies – from the renewable’s deployment, along the pathway to PtX consumer ready products.
I joined the International PtX Hub in February 2023 and support our activities in and from South Africa, bringing in hands-on experience with several GIZ energy projects in Ethiopia.

Frank Renken
Lead Algeria
Frank Renken
Lead Algeria
Based in Algiers, Algeria
I am coordinating all activities of the PtX Hub and other projects of GIZ on green hydrogen in Algeria.
Algeria is committed to develop sustainable energy production and reduce green house gases. With a team of highly motivated colleagues, GIZ helps to achieve these goals with technical expertise.
Having worked in the aviation industry, I finished my doctorate in political sciences in the 2000ies with a thesis on Algerian international relations.

Mounir Zerroukhat
Junior Technical Advisor Algeria
Mounir Zerroukhat
Junior Technical Advisor Algeria
Based in Algiers, Algeria
Based in Algeria, I am working for Power-to-X technologies (PtX) as well as green hydrogen promotion and development since November 2022. Our main goal is to implement a suitable framework for a sustainable PtX infrastructure in the country. This could be achieved via organizational and regulatory advice, technical support, knowledge exchange and networking platforms, which we are working for.
I have started my career at GIZ in August 2021, working in a project to enhance waste management systems on a municipal level. I hold a master’s degree in waste management and treatment processes, and graduated in process engineering at Blida university, Algeria.
I believe that the energy transition plays an essential role to assure a sustainable development.

Tuliikeni Ndadi
Senior Technical Advisor Namibia
Tuliikeni Ndadi
Senior Technical Advisor Namibia
Based in Windhoek, Namibia
I am the Project Manager for the PtX Hub in Namibia. My goal is to ensure that the framework conditions for production in Namibia are sustainable, to secure financing, to build international networks and partnerships, to generate knowledge, and to tap country and market potential.
By profession, I am a Mining Engineer with a Master’s in International Mineral Resources Management from the UK. Additionally, I hold a certificate in Project management and a diploma in Development Finance.

Kevin Mwangi
Advisor Kenya
Kevin Mwangi
Advisor Kenya
Based in Nairobi, Kenya
I am responsible for implementation of the PtX activities in Kenya that focus on the analysis of the potential for PtX concepts in the country, building technical capacity of stakeholders and supporting to build an enabling environment for privates sector involvement in PtX.
Kenya is a renewable energy resource rich country and this provides an opportunity for the defossilisation of our economy through PtX.
Previously, I have been involved in promotion of an enabling environment for the development of variable renewable energy in Kenya. I have a Bachelors in Energy Engineering and am a Certified ReGrid Manager.

Joy Mutanu Nzue
Junior Advisor Kenya
Joy Mutanu Nzue
Junior Advisor
Based in Nairobi, Kenya
I recently joined the International PtX Hub to support the implementation of activities in Kenya. This position is combined with my work in the project power system readiness for grid integration of variable renewable energy (VRE).
Prior to joining the team, I interned with the GIZ in Energy Solutions for displacement settings project, and at Res4Africa Foundation in their various renewable energy solutions for Africa Initiatives. Just Energy Transition and youth participation in climate action are two topics I am passionate about. My academic background includes a bachelor degree in electrical and electronics engineering.

Nooraldeen Balah
Energy Advisor Jordan
Nooraldeen Balah
Energy Advisor Jordan
Based in Amman, Jordan
Green hydrogen and Power-to-X present an intrinsic opportunity to defossilise all sectors of today’s economy.
Since October 2022, I am the PtX Hub Advisor in Jordan. My role is to provide technical and regulatory support to the Ministry of Energy in Jordan as well as to enroll the green hydrogen topic within Jordanian universities.
I hold a bachelor’s degree in Mechanical Engineering and I have experience in the implementation of energy efficiency and renewable energy measures on water and waste water facilities.
Asia

Markus Bissel
Project Director Vietnam
Markus Bissel
Project Director Vietnam
Based in Hanoi, Vietnam
I joined GIZ Vietnam in July 2019 as the team leader of the energy efficiency component. In the meantime, I am also heading the Smart Grid for Renewable and Energy Efficiency Project and the PtX Hub activities in Vietnam.
As a holder of a German diploma in plant engineering and having more than 20 years of professional experience in the municipal and industrial energy sector, I strongly believe that the next step on the global energy transition path will be based on the green hydrogen economy.

Gaurav Sharma
Technical Advisor India
Gaurav Sharma
Technical Advisor India
Based in New Delhi, India

Alina Tetzlaff
Private Sector Advisor India
Alina Tetzlaff
Private Sector Advisor India
Based in New Delhi, India
I joined the PtX Hub in India as Private Sector Advisor in September 2022. I am responsible for facilitating collaboration between the private sector, policymakers and research institutes in India and Germany. As part of its efforts to decarbonise its economy, India has ambitions to grow into a global green hydrogen hub.
My goal is to promote knowledge exchange through dialogue and networking platforms and ensure that perspectives of partner countries, such as India, are heard globally. I hold a master’s degree in political science and public administration from the University of Konstanz. I look forward to being part of the PtX Hub and working towards achieving the global energy transition.

Divya Joshi
Junior Communication Specialist
Divya Joshi
Junior Communication Specialist
Based in New Delhi, India
I joined the team in November 2022 with the responsibility of supporting communication activities for PtX Hub India.
India is on its journey to emerge as a global champion in green hydrogen and it is fascinating to see its ambitious drive towards becoming self-reliant through clean energy. Besides handling communications, I am also responsible for extending administrative support to two of the subworking groups of the Indo-German Green Hydrogen Taskforce.
I did my Master’s in English Literature and Post Graduate diploma in Advertising and Marketing Communication. Prior to my current role, I managed communication and outreach activities for a public policy think tank based in New Delhi.