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The solar power satellite (SPS), Space Solar Power (SSP), or Space Based Solar Power (SBSP) attracts attention since they can send CO2 free clean energy 24 hours a day. However, SPS sends the energy by microwave. Frequency allocation is an important issue for SPS as well as WPT (wireless power transmission). ITU (international telecommunication union) activities on spectral management are an essential step for this purpose. We have contributed to ITU-R Question 210/1 entitled, Wireless power transmission. The present frequency allocations and interferences to existing services by SPS or WPT should be examined. International cooperation is essential in ITU. Issues related to frequencies for SPS and WPT and international activities will be reviewed.