"Techno-Economic Calculations in Energy" by V.I. Denisov is an essential work that will appeal to both students and professionals working in the energy sector. This book is more than just a textbook—it's a practical reference guide for anyone seeking a deeper understanding of the economic aspects of energy projects and their technical and economic justification. Centered on key questions related to techno-economic calculations, the book explores the essential methods needed for effective management of energy systems. The author shares his extensive experience and insights, helping readers master fundamental techniques for analyzing and evaluating investment projects in the energy industry. Covering a broad range of topics—including cost-benefit analysis, risk assessment, and optimization of energy processes—each chapter is written with clarity and accessibility, making complex concepts understandable even for those just beginning their journey in this challenging yet fascinating field. Who will find this book valuable? Primarily, it is a useful resource for students of engineering and economics studying energy, as well as graduate students and young professionals looking to deepen their expertise in techno-economic analysis. Additionally, practicing engineers, managers, and economists working in energy companies will benefit from its practical insights, enhancing their decision-making skills based on solid economic calculations. The themes addressed in this book are highly relevant in today’s world, where sustainable development and efficient resource utilization are more critical than ever. Denisov emphasizes the importance of thorough techno-economic justification for projects, which helps avoid unprofitable investments and promotes more rational use of energy resources. In the context of global climate change and the shift toward alternative energy sources, knowledge of these analytical methods becomes especially vital for specialists in the field. Denisov’s writing style is characterized by logical structure and clarity, making complex ideas easier to grasp. He frequently incorporates real-world examples, which enhance the practicality and applicability of the material. The author also references his previous works, such as *Energy Efficiency and Sustainable Development* and *Innovative Technologies in Energy*, providing readers with a comprehensive view of his research approach and solutions to pressing industry challenges. If you're looking for a book that will help you understand the intricacies of techno-economic calculations in energy, *Techno-Economic Calculations in Energy* by V.I. Denisov is your reliable guide. It will enrich your knowledge, inspire new ideas, and support your projects in the energy field. Read, learn, and apply these insights to contribute to the development of sustainable and efficient energy systems.