Pennsylvania Public Utility Commission
Annual Winter Reliability Assessment

Introduction – How Gas Is Delivered

• Extracted from wells and moved from collection point into gathering system for sale into the wholesale market
  • Includes processing facility where natural gas is purified and useful by-products such as propane and butane are removed
• Moved into transmission system using compressors
  • counteracts friction that is created when gas is moved through steel pipe
• Transported by midstream companies to utility’s delivery point (“city gate”) or to upstream storage
  • Pressure reduced
  • Odorant added
• Moved into utility’s distribution pipeline and delivered through individual service lines to customer
  • pressure further reduced for delivery

Supply and Demand – Winter 2018-2019
(all natural gas volumes in billions of cubic feet)