In many cases, an invoice has been issued because there is an outstanding fee for the use of LPG Equipment. This charge includes the use of gas cylinders and tanks and is charged annually, monthly, or quarterly depending on your LPG Supply Agreement.
Your invoice will have “LPG Equip Fee” detailed in the product description typically on the second page of your invoice. The LPG Equipment Fee was previously called a Facility Fee or referred to as a “rental fee”.
There’s more information on your LPG bill online.