The Role

Are you passionate about energy storage and eager to apply your engineering skills in a fast-growing renewable energy environment? We are looking for a motivated BESS Intern to join our Energy Storage team, supporting the development and operation of Battery Energy Storage System (BESS) assets. Based in Madrid within the wider technical team and reporting to the relevant BESS Manager, this role offers the opportunity to contribute to operational excellence while gaining exposure to project development, construction, commissioning, and asset performance activities.

The BESS Intern will support the analysis and optimization of operating assets, develop tools and insights for BESS operations, and assist with projects under construction. You will collaborate closely with engineering, construction, operations, and commercial stakeholders, contributing to schedule reviews, commissioning activities, contract assessments, and technical design reviews that help ensure the successful delivery and performance of energy storage projects.

Desirable skills:





• Electrical Engineering degree or currently pursuing a degree in Electrical Engineering
• Strong analytical skills with the ability to interpret operational and performance data
• Familiarity with project documentation, technical specifications, and engineering drawings
• Exposure to or interest in developing knowledge of Battery Energy Storage Systems (BESS) and power system fundamentals
• Proficient English communication skills, with the ability to collaborate effectively in an international environment
• AI & Digital Literacy: experience using or developing digital tools or workflows to improve efficiency, innovation, and productivity

We deploy AI across the business, from generation and trading decisions to the everyday workflows of every team. We invest in our people’s digital fluency so everyone works alongside these tools with confidence.

Studies show that many qualified candidates hesitate to apply unle

📌 BESS Intern (Madrid)
🏢 Sonnedix
📍 Madrid