The event will take place at August Revolution Square in Hanoi and other locations across the country at 8 p.m today (March 19th). All lights and electric devices will be turned off from 8:30 p.m. The campaign began in the beginning of March and has attracted thousands of people and enterprises, with several activities, such as cycling and running. Vietnam launched the campaign in 2009. Last year, the country saved 520 thousand Kw/h, equivalent to about 38 thousand USD.