PROBLEM TO BE SOLVED: To transmit electric power between different regional blocks without restricted by flexible electric energy and frequency by improving the liquidity of the electric power as a commodity and substantially mitigating the simultaneity of the power demand supply. SOLUTION: An electric power transaction market by a computer 1 is established using a communication network 2 such as Internet, power sellers (power generator, PPS, etc.), 3, and power buyers (demanders, PPS, etc.), 4 and 5 transact one another via a power transaction market computer so as to improve the liquidity of the electric power as the commodity. The electric power can be transferred by issuing electronic securities, which imposes an obligation on the power buyer to feed the power equivalent to the quantity of the power bought at an appropriate time as a substitute for paying the electricity rate, so as to substantially mitigate the simultaneity of the power demand supply. The electric power transaction market is made wide range by expanding into multiple regional blocks of general electric utilities and power demand/supply is substantially attained between the different regional blocks without restricted by the flexible electric energy and the frequency due to the distributability of the electronic securities.
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