TOKYO -- Japanese trading conglomerate Mitsubishi Corp. will develop a massive onshore wind farm in Laos that will supply electricity to Vietnam. The facility will have power generation capacity of 600 megawatts, making it one of the largest onshore wind farms in Southeast Asia. The price tag is expected to run in the hundreds of millions of dollars. A Mitsubishi subsidiary will take a 20% stake in a joint venture to be formed with two Thai renewable-energy developers. Construction by the new company is slated to start by the end of this year with operations to begin in 2024.