(a) Power retailers are responsible for purchasing power:<br>Japan's power companies have the responsibility to purchase the remaining electricity generated by small-scale solar photovoltaic system at a fixed feed in price, and grant power grid connection rights.<br>However, in order to balance the supply and demand of electricity, grid operators can stop importing renewable energy power from each facility for up to 30 days each year without compensation. If the power grid operator is expected to stop importing power for more than 30 days, he can also refuse to sign an agreement to connect the power grid;<br>
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