A new Views & Comments article published in Engineering outlines a structured four-stage system integration pathway to guide global energy system transformation toward carbon neutrality, based on systems theory and systems engineering principles. The study indicates that energy system transformation toward carbon neutrality is more complex than historical energy shifts, as it faces insufficient public awareness of climate urgency and incomplete market readiness for key enabling technologies such as energy storage, demand-side response, distributed energy systems, and green hydrogen. The authors emphasize that such transformation requires an energy-societal paradigm shift involving coordinated changes in politics, economy, industry, and society, rather than technological or policy measures alone.

The proposed pathway divides the transformation into four sequential phases centered on progressive system integration. The first stage focuses on electrification within the multi-energy era through the deployment of smart grids integrating centralized and distributed energy resources, supported by scaled-up wind and solar power and advances in energy storage and demand-side response to manage intermittency. The second stage evolves smart grids into smart energy systems by integrating electricity, heating, and fuel networks, with technological progress in hydrogen and low-carbon heating supporting cross-sector decarbonization in industry, transportation, and power generation. The third stage aims to develop ecological energy systems that align energy cycles with natural systems, using biomass energy, negative emission technologies, and resource recycling to support a circular economy and address resource and environmental constraints. The fourth stage envisions long-term exploration of advanced energy technologies such as nuclear fusion to provide sustainable clean energy, supporting broader human development beyond Earth.

Alongside the pathway, the study introduces the T-ESGO framework, which centers on a Trinity of experts, models, and data to integrate energy, material, carbon, and information flows across society. This framework is driven by three core factors: innovation, interdisciplinary collaboration, and international cooperation, supporting iterative learning and practical implementation to address systemic challenges in decarbonization. The authors note that international cooperation mechanisms need to evolve with each transformation stage, covering technological alliances, green energy trade agreements, and ecosystem-level collaboration. The research provides a systematic framework for coordinated global action, highlighting the need for sustained technological innovation, interdisciplinary research, and inclusive international collaboration to advance energy system integration and achieve long-term carbon neutrality goals.

The paper “Promoting Global Energy System Transformation Toward Carbon Neutrality: A Four-Stage Pathway of System Integration,” is authored by Linwei Ma, Maximilian Arras. Full text of the open access paper: https://doi.org/10.1016/j.eng.2025.07.031. For more information about Engineering, visit the website at https://www.sciencedirect.com/journal/engineering.