SINGAPORE, May 21 (Reuters) -

* State-run China Southern Power Grid completed the firstspottrading of electricity in the country's southern provinces,official Xinhua News Agency reported on Tuesday

* The trades involve 123 power distribution companies, 190powergenerators and three major users, the report said

* Average ex-plant power prices were reported at 0.263 yuan ($0.0381) per kilowatt hour (kwh) during the pilot transactions;Prices for low-demand night hours were 0.082 yuan/kwh and thosefor peak-demand hours at 0.362 yuan/kwh, the report said

* The government said last year it would launch spot powertradingin eight regions, including Guangdong, western Inner Mongolia,Zhejiang, Shanxi, Shandong, Fujian, Sichuan and Gansu, as partof the efforts to liberalise power prices currently set by thestate

($1 = 6.9060 Chinese yuan renminbi)

(Reporting by Chen Aizhu; editing by David Evans) ((aizhu.chen@thomsonreuters.com; +65 6870 3284; ReutersMessaging: aizhu.chen.reuters.com@reuters.net))