DALLAS, Oct. 29 /PRNewswire/ -- Fall's cool temperatures are here, marking the best time for homeowners to plant trees that will flourish in the spring. Autumn provides the perfect environment for planting tree seedlings because root systems have plenty of time to establish themselves before the intense Texas summer begins. (Logo: http://www.newscom.com/cgi-bin/prnh/20070829/ONCORLOGO) Trees are vital to any landscape. According to the International Society of Arboriculture, trees provide shade and shelter, reducing yearly heating and cooling costs by $2.1 billion. However, trees are one of the primary causes of power outages when planted too close to power lines and electrical equipment. Tree limbs in contact with power lines can act as conductors and can potentially cause serious injury if there is contact. "Oncor encourages homeowners to check for overhead and underground power lines before planting and to review native trees recommended by Oncor that can be planted near power lines," said Brenda Pulis, Oncor's senior vice president of distribution. "Ideally, trees should be planted where they can grow without any chance of touching power lines." The DIG TESS program can help with locating underground power lines. State law requires Texans to call the toll-free DIG TESS number in order to have underground utility lines located and marked before digging 16 inches or deeper. The number is 1-800-DIG-TESS (1-800-344-8377). Always call at least two working days before digging. Oncor wants all Texans this season and year-round to make the right decisions when planting trees. Information on Oncor's Know Before You Grow program is available at http://www.oncor.com under the Community section. Go to Vegetation Management for a downloadable brochure and information on 20 native trees recommended by Oncor. Oncor is an electric distribution and transmission business that provides power to more than 3 million homes and businesses and operates more than 115,000 miles of transmission and distribution lines in Texas. Information about Oncor can be obtained by going directly to http://www.oncor.com.