The energy sector is at a pivotal moment, facing unprecedented challenges from climate change, resource scarcity, and a rapidly evolving global economy. For decades, the industry has relied on established, centralized models. However, the Fourth Industrial Revolution, or Industry 4.0, is now providing the tools to fundamentally rethink how we generate, transmit, and consume energy. This book, Industry 4.0 in Energy Systems, is for the professionals on the front lines of this transformation. It moves beyond the buzzwords to offer a clear, practical roadmap for leveraging technologies like AI, IoT, and digital twins to build a more efficient, resilient, and sustainable energy future. Our goal is to bridge the gap between theoretical innovation and real-world application, providing actionable insights that can be implemented today to prepare for the grid of tomorrow. This is not just a book about technology; it's a guide to the future of energy.