Energy Internet has presently become a research focus of academic and industrial circles. As one of the key technologies

big data will play a pivotal role in its development. Achievements in big data research and practice of Energy Internet at home and abroad are summarized

its concepts and characteristics enunciated

and its significance and main application domains detailed. Furthermore

challenges confronted by big data in terms of technology and management are summed up. On this basis

important application domains in Energy Internet are combed

meanwhile research framework and technology roadmap of big data are proposed. Finally

the status quo of big data research in Energy Internet is presented

its development and advancement asking for endeavors of multiple quarters.This work is supported by State Grid Basic Prospective Research Program(No. DZ71-15-004)and State Grid Corporation of China(No. TX71-15-056).