Qingdao Anbang received the reply it was waiting for, on Sept 6, from the Qingdao Power Supply Bureau, saying that the Qingtao Anbang 35 kv substation could use a two-way independent power supply, at the 35-kv industrial electricity rate, a basic tariff charged according to maximum demand, with no high-reliability electricity charge. This means Qingdao Anbang will have a coordinated double-power operational mode for its oil and gas system, with a power supply reliability of 200 percent. It can save 3.84 million yuan annually in tariff charges after the new system takes effect.