A natural gas bill is not a single number. It is a stack of line items: a fixed customer charge, delivery charges (covering transportation, storage, and distribution through the utility's pipes), and the gas supply charge itself, which is the commodity cost passed through from the wholesale market. A quarterly rate adjustment mainly moves the commodity and transportation portions. Delivery rates and the customer charge are set separately in annual rate cases and will not change on April 1.
The practical effect is that the April 1 decrease shows up primarily in the "Gas Supply Charge" line, with some additional movement in transportation costs depending on the zone. That is also why the zone-by-zone impact varies so dramatically — Enbridge sources gas from different pipeline routes depending on geography, and the transportation component is bundled differently in each zone. A customer in Union North West, served by a shorter and currently less expensive supply path, sees a far larger percentage drop than a customer in the densely populated Enbridge Gas Distribution zone around the GTA.
Here is the zone-by-zone breakdown for a typical residential customer, based on the OEB's approved rates:
Two patterns jump off the page. Union North West gets more than twice the dollar relief of any other zone. And Union North East — which started with the highest typical annual bill of the four — sees the smallest percentage drop. Neither is unusual. Transportation and supply costs in the north are driven by a different mix of pipelines and long-haul routes, and when wholesale conditions shift, the northern zones tend to move in larger steps than the more stable southern zones.
One small bill-line caveat worth flagging: the federal carbon charge was removed from Enbridge bills effective April 1, 2025, and it does not return on April 1, 2026. A separate, much smaller facility carbon charge — about 32 to 35 cents per year for a typical residential customer — remains embedded in the "Delivery to You" line, unchanged by this QRAM.