State-grid-affiliated Chinese entities dominate the assignee ranking in this dataset, led by State Grid Corporation of China and its research affiliates such as China Electric Power Research Institute Co., Ltd.. International players including Siemens AG (Siemens), Hitachi Energy Ltd. (Hitachi Energy) and ABB-affiliated entities also appear, but with lower filing volumes. Recent-year momentum for most of the top-ranked assignees shows zero filings in the latest year, which reflects either genuine slowdown or the normal publication lag rather than an abrupt exit from the field.

Every record in this corpus carries an H02J classification, the core power-supply-and-grid subclass, which confirms filings are squarely about grid hardware and control rather than adjacent software alone. The next largest groups — G06Q for business/data processing and G06F for digital data processing — show that dispatch optimisation and data handling are established secondary claim areas. Smaller subclasses like G06N (AI models), H04L (digital communications), B60L (EV propulsion) and G05F (electric variable control) each account for single digits of the 165 records, indicating those integration points are still open rather than heavily claimed.

Of the receiving offices in this dataset, China accounts for 117 of roughly 156 identifiable filings, far ahead of India (15), the United States (11), the EPO (5), South Korea (4) and WIPO/PCT filings (4). This concentration tracks China’s large-scale microgrid and distributed-energy deployment programmes, which have driven state-grid-affiliated entities to file defensively and offensively around energy-management and protection architectures. It does not necessarily mean the underlying technology originated in China, but it does mean freedom-to-operate analysis for the Chinese market needs to weight this corpus heavily.