China’s Huaneng Power International, Inc. (NYSE: HNP; HKEx: 902; SSE: 600011) said that the on-grid tariff for the expansion project of Jining Power Plant Units 5 and 6, each with a capacity of 135MW, has been approved by the government. The on-grid tariff was RMB 320 per MWh (including VAT), which has been effective from…