Huaneng Power International, Inc. shares are currently trading up about 7.9% on the day.

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Huaneng Power gained 4.6% in Hong Kong after reporting late Tuesday that its first quarter net profit almost tripled on-year to 2.55 billion yuan.

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In the case of Huaneng Power International, Inc.

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Duke Energy recently announced a memorandum of understanding with the China Huaneng Group, China's largest power generator, and the ENN Group, one of the nation's largest private energy companies.

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