Internship programs

XEnergy & ENNA Group – Internship Program 2025

We are proud to announce the new generation of the XEnergy Internship Program for female students, organized in collaboration with one of Croatia’s leading companies in the field of green innovation – ENNA Group.

This four-week internship offers an opportunity to work on real challenges of the energy transition, with guidance from top industry experts and the chance to contribute to projects that combine sustainability, technology, and market innovation.

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What is an internship program?

  • Professional practice that allows female students to gain experience and valuable insight into the functioning of a successful international energy company
  • Participation in specific projects under the supervision of excellent mentors from E.ON.

You can apply for the Internship program

  • if you have the status of a regular student
  • if you are a student of graduate university or professional studies in the field of technical or
  • social sciences
  • if you want to gain new business experience and enrich your CV

How to apply for the Internship program?

  • you can send your application along with your CV and motivation letter on button below

Meet our mentors

Our mentors are a dedicated team of event planners, travel enthusiasts and sustainability advocates, boasting over twenty years of collective expertise in orchestrating successful events.

  • Mentor

    Marijeta Majer

    Head of Energy Projects

  • Mentorica

    Nikolina Čović

    Portfolio Management Associate

    LinkedIn
  • Mentor

    Luka Krilić

    Head of Portfolio Management

    LinkedIn
  • Mentor

    Branimir Herceg

    Head of Operations

    LinkedIn
Project topics

The Future of Energy Sales: Transition from Energy Seller to Energy Solutions Provider

ABOUT THE MENTOR: Marijeta Majer graduated from the Faculty of Economics in Osijek, majoring in Financial Management. She began her career at Prvo plinarsko društvo, where she progressed over the years from a junior sales role to Head of Procurement and Controlling, gaining a deep understanding of business processes in the energy sector, with a focus on strategic procurement and financial planning. She currently works at Enna Next as Director of the Energy Projects Sector, leading the development and implementation of strategic energy initiatives and multidisciplinary teams. She combines experience in finance and energy with market and sales knowledge, focusing on innovative and measurable strategies that deliver results, as well as continuous professional and team development.

TOPIC: Explore how energy companies are changing business models – instead of just selling energy, they offer solutions that combine technology, sustainability, and financial feasibility.

Traditional sales: Gas, electricity – sales based on price, quantity, and contracts.
New paradigm: Selling systems that include consulting, installation, technology, financial models, and energy management.

The Role of Battery Storage in Increasing Household Energy Independence with Photovoltaic Systems

ABOUT THE MENTOR: Nikolina Čović graduated from FER in 2020 and earned her PhD in early 2025 on providing flexibility services to the power system. As an assistant at the Department of High Voltage and Energy, she gained experience working on numerous industrial, domestic, and European projects, while actively teaching courses on renewable energy and energy storage. She currently works at ENNA Next as an Associate for Portfolio Management, analyzing energy data and developing comprehensive solutions for photovoltaic systems and battery storage.

TOPIC: Investigate the role of battery storage in increasing household energy independence with photovoltaic systems. The project will analyze different battery technologies, their costs, durability, advantages, and limitations, with a focus on the regulatory framework and available incentives in Croatia and the EU. Real-world examples will be used to evaluate the economic benefits and challenges of investing in battery systems and to provide recommendations for end-users on optimal solutions and applications.

Impact of Solar and Wind Power Production on Electricity Prices and Grid Deviations

ABOUT THE MENTOR: Luka Krilić currently serves as Portfolio Management Lead at Enna Next. He has been active in the energy sector since his student days, with experience in electricity and gas trading, portfolio management, market analysis, and developing strategies to optimize production and consumption. He studied Energy Engineering at the Faculty of Mining, Geology, and Petroleum Engineering, University of Zagreb. His interests include renewable integration, portfolio optimization, price volatility, and market flexibility in the context of the European energy transition.

TOPIC: Analyze how the volume of production from solar and wind power plants, in absolute terms (MWh) and as a share of total consumption and production (%), affects electricity prices and grid deviation indicators (deviation in MWh and deviation price in €/MWh).

Automation of Reporting Processes from Multiple Sources

ABOUT THE MENTOR: Branimir Herceg is an expert with over 10 years of professional experience, primarily in the energy sector, operations, data management, and banking.

He currently serves as Head of Operations at ENNA Next d.o.o., responsible for managing operational processes and business optimization. Throughout his career, he has held roles such as Product Coordinator (E.ON Croatia) and Energy Procurement, Pricing, and Product Specialist (RWE Croatia), gaining deep knowledge of energy markets and wholesale trading. He holds a degree in Information Technology (University of Zagreb) and is recognized for his skills in team leadership, Microsoft Excel, analytics, energy, and project planning.

TOPIC: Generate complex predictive reports that forecast future realized quantities and margins, requiring data collection from multiple sources (e.g., measurement systems, databases, exchanges), processing, standardization, and integration into a final report. The project also explores possibilities for automation and visualization of this process.

Our 2024 Internship Program

XEnergy, in collaboration with E.ON Croatia, hosted the first internship program for female students of master’s and professional university programs across various fields: STEM, economics, and law.

The program offered students an outstanding opportunity to gain experience in the international company E.ON Croatia, a leader in energy transition in Croatia and Slovenia, which employs 72,000 people across 16 countries and serves 48 million customers worldwide.

During the program, participants were actively involved in various company activities at E.ON, gaining professional experience and learning about corporate culture. They also had the chance to work on concrete projects under the guidance of their E.ON mentors and experts from various XEnergy boards.

Internship program 2024.