[en] Highlights: • Recent progress in blue energy harvesting with TENG technology is reviewed. • The fundamental physics mechanism of nanogenerators is the Maxwell's displacement current. • The TENG network is proposed for large-scale blue energy harvesting. Widely distributed across the globe, water wave energy is one of the most promising renewable energy sources, while little has been exploited due to various limitations of current technologies mainly relying on electromagnetic generator (EMG), especially its operation in irregular environment and low frequency (the energy for the new era – the era of internet of things.