Kirk here with news that's old but should still be of interest if, like me, you missed it when it first came out:

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Osaka-based Kansai Electric Power Co. is at the heart of the anti-competitive behavior. It had formed one-on-one cartels with Chugoku Electric, Chubu Electric and Kyushu Electric, according to the sources.
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Our electric bills here in Kumamoto (where we rely on Kyushu Electric) have probably been excessively high because of the collusion.