Penn West Energy Trust, Calgary, (NYSE: PWE; Toronto: PWT) has entered an agreement to acquire Vault Energy Trust, Calgary, (Toronto: VNG) for approximately C$380 million in stock. Vault operates in west-central Alberta and northeastern British Columbia, including properties at Wimborne, Bigoray, Pembina, Crystal, and Westerose, all near Penn West's core area of light-oil properties. Assets include more than 2,300 wells producing 6,500 barrels equivalent per day (65% gas, 35% light oil and gas liquids), 20 oil batteries, four gas plants, numerous compressor stations, and 120,000 net undeveloped acres.