MANILA (Philippine Daily Inquirer/ANN): The Department of Energy (DOE) is investigating if there was collusion among power firms amid the rotational brownouts experienced in Luzon earlier this month. During the hearing of the Senate Committee on Energy on Thursday (June 10), DOE Secretary Alfonso Cusi said the “ultimate cause” of the rotational brownout was the forced and unplanned outages of several major power plants servicing the Luzon region. “The loss of supply from major power plants happened simultaneously. That is the ultimate cause, ” Cusi said. “We are already investigating these power plants and we have asked the assistance of the Department of Justice, the Philippine Competition Commission, and the Energy Regulatory Commission to determine if there was collusion. If found to be so, proper charges shall be filed against those who are responsible, ” he added.