This law was implemented in 2004, with later amendments. Through this law, a higher electricity price is applied to industries and products with an electricity-consumption level higher than the standard. The policy is implemented at a national level, but the prices are set by provinces individually.
"The study finds that, during 2004–2009, the policy accounted for a drop of roughly 115 TWh in electricity use, which amounted to a reduction of 82 million tons of CO2 emissions." (http://www.sciencedirect.com/science/article/pii/S0301421512001668)