China will raise power tariff surcharges for some energy-intensive companies by 50 to 100 percent from June 1 in renewed efforts to curb expansions in energy-guzzling and polluting industries, according to a notice on the website of the National Development and Reform Commission (NDRC).

These companies are mainly in the aluminum, cement, steel, zinc, ferroalloy, calcium carbide and sodium hydroxide sectors.

In the notice, the NDRC requires local governments and power suppliers to cancel favorable power rates to aluminum, ferroalloy and calcium carbide makers at a designated date, and halt unapproved preferential power rates in the name of direct trade between power generators and power users immediately.

Similar regulations have been loosely observed at local levels especially since late 2008 when fending off an economic slowdown became a priority agenda.