Due to the complexity of interconnecting large-scale DG projects, an impact study must be performed. Customers should allow six to eight weeks for the completion of this study. Based on the results of the impact study, upgrades or changes may need to be made to the transmission or distribution equipment, and in some cases this equipment may have long lead times. In addition, some changes may require clearances that cannot be scheduled during high-load periods and could result in project delays. Oncor will work with customer schedules and provide expected construction scheduling timelines after funding and securing of proper documentation.

Upon request, Oncor will perform prescreens prior to an impact study. This simple screen will assess the requested generation capacity and determine if there is available distribution capacity at the requested location. Results of prescreens are subject to change and may vary from the findings of the final impact study.