The Evolution of Insulating Paper: Bio‐Based and Circular Solutions for High‐Performance Electrical Insulation

Conventional electrical insulating papers, primarily cellulose-based and synthetic aramid, have long been foundational in the power industry but exhibit significant sustainability deficits and emerging performance limitations. Their production is resource-intensive, reliant on fossil fuels, and poses end-of-life challenges, while modern high-frequency and high-voltage systems expose their technical bottlenecks. This work details a paradigm shift towards advanced bio-based dielectrics, centered on nanocellulose and functional hybrid materials, which offer superior mechanical, dielectric, and thermal properties. It further advocates for a systemic transition integrating green manufacturing pathways, such as enzymatic refining and foam-forming, within a circular economy framework. This approach utilizes Life Cycle Assessment (LCA) for quantitative environmental evaluation and incorporates “Design for Circularity” principles to ensure recyclability and upcycling, paving the way for the next generation of high-performance, eco-friendly electrical insulation.