Glossary

Distributor/LDC

The local company delivering electricity and issuing the bill.

IESO

The organization operating Ontario’s bulk electricity system and wholesale market.

OEB

Ontario’s energy regulator.

RPP

Regulated Price Plan, including TOU, Tiered and ULO options.

TOU

Time-of-Use pricing with off-, mid- and on-peak periods.

ULO

Ultra-Low Overnight pricing with a very low overnight price and a high weekday on-peak price.

Delivery

Transmission and local distribution charges, including fixed and variable elements.

Ontario Price

Renewed wholesale-market price terminology used after market renewal in 2025.

HOEP

Historical Hourly Ontario Energy Price used in the legacy market through April 30, 2025.

GA

Global Adjustment, a system-level reconciliation mechanism.