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Diamond Transmission Partners Limited is a partnership between Diamond Transmission Corporation Limited ("DTC") and MUL Infrastructure UK Limited (“MIUK”) and Chubu Electric Power Netherlands.

DTC is a wholly owned subsidiary of Mitsubishi Corporation (“MC”) since 2012 which is one of the largest Japanese trading and investment houses. MC has established DTC in London as a holding company to integrate MC’s investment activities in European transmission sector. As of January, 2018, DTC has 9 assets in the UK and Germany totalling circa 4.4GW and c.£3.6bn.

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MUL Infrastructure UK Limited (“MIUK”) is a wholly owned subsidiary of Mitsubishi HC Capital Inc. (“MHC”). MHC has established MIUK as an investing arm for MHC’s investment activities in European infrastructure. MHC has made investments in renewables, power transmission, power distribution and water business as these sectors being MHC’s strategic areas.

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CEPCON (Chubu Electric Power Company Netherlands B.V.) is a wholly owned subsidiary of Chubu Electric Power Co., Inc.("Chubu"), which as a whole Chubu group is a major transmission operator in Japan with responsibility for over 12,000km of transmission lines and 900 substations. Chubu's total assets as of March 2020 is £40.7 billion.

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