1. Tokyo Electric Power Co On surplus electricity buyback program for photovoltaic power generation.
2. METI Agency for Natural Resources and Energy Convincing - renewable energies 2015
3. The electric business law enforcement regulations, Art. 48.
4. METI On handling residential photovoltaic power generation facilities and chief electrical engineers.
5. METI On amendment to Interpretation of the technical standards of electrical equipment (regulations on bank reverse power flow).