Power lines and wind turbines are pictured at a wind and solar energy storage and transmission power station of State Grid Corporation of China, in Zhangjiakou of Hebei province, China, March 18, 2016. REUTERS/Jason Lee/

BEIJING, July 15 (Reuters) - China's energy regulator will strengthen supervision of power dispatch transactions and the overall market to ensure a stable power supply, it said on Friday.

The statement by the National Energy Administration during a meeting with the country's largest state-owned power generators comes only three days after the national power load hit a new high during summer heatwaves.

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Volkswagen Group sales fell by around a fifth in the first half of this year from a year earlier, company data showed on Friday, led by a steep drop in Europe, but battery-electric sales were boosted by growth in China.

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