NYSE-listed Huaneng Power International, Inc. has announced tariff cuts of between 0.2% to 2.4% for its four power plants in Jiangsu Province on China’s east coast retroactive from January 30. The on-grid tariff for the Nanjing plant was adjusted from RMB336.1 per MWh to RMB334 per MWh while Nantong’s was lowered from RMB334.6 per MWh…