This paper explores the impact of digital government on the innovation and reuse of renewable energy firms in depth from a sustainability perspective. The survey found that digital government support for renewable energy businesses has grown at an average annual rate of 30% over the past five years. In the past three years, digital government investment in technological innovation of renewable energy enterprises has increased by 70%, enabling renewable energy enterprises to make breakthroughs in technology research and development. The digital government has implemented a series of policies and measures conducive to the development of renewable energy enterprises, such as tax incentives, subsidies, and green finance, which have provided more development opportunities for renewable energy enterprises and opportunities for innovation and reuse. In the future, digital government will continue to play a role in the field of renewable energy and contribute to the achievement of the SDGS. This study reveals the significant promotion effect of digital government support on the innovation and reuse of renewable energy enterprises, and further promotes the development of sustainable energy. These findings not only provide access to policy makers with valuable information on how to promote the green energy transition through digital means, but also provide innovative directions for renewable energy companies, and provide researchers with a perspective to further explore the relationship between digital government and sustainable development.