China's largest independent electricity provider, Huaneng Power (NYSE:HNP), announced an increase of on-grid tariffs by Yuan22.51/MWh or 5.7% as of August 20, 2008. This increase is the second in 2008 aimed at compensating for high coal prices. China is potentially facing one of the worst power shortages in years, similar to 2004, when brown outs were rampant. The government has just ordered coal exporters to cut back on exports - so far it was an oral note. The fact of the matter is that since coal prices has been capped to keep prices low domestically, Chinese coal miners preferred to sell coal on the spot market instead. The result is low coal inventory level at power producers, potentially threatening stable power supply.