Power Supply and Delivery

Most of the electricity we provide to customers comes from several utility-owned hydroelectric resources located in the Pacific Northwest. To make up the difference, we purchase any additional power needed from other energy providers.

City Light Energy Resources

Map showing the sources of City Light's energy

Map Key:

Blue color swatchCity Light owned hydropower

Orange color swatchTreaty rights from British Columbia

Black color swatchLong-term hydropower contracts (CBH is Columbia Basin Hydropower)

Yellow color swatchOther long-term contracts

To maintain our carbon-neutral status, we purchase Renewable Energy Credits (RECs) to offset carbon from energy purchased from other providers. We also invest in energy conservation that minimizes electricity demand.

How Your Energy Gets to Your Home or Business

Electricity is delivered to your home or business through our extensive network of transmission towers, substations, and distribution lines.

Graphic of a dam7 hydroelectric facilities
owned by City Light

Graphic of a transmission tower2,330.9 miles
of distribution circuit

Graphic of an electrical substation16 major substations
in City Light service territory

Graphic of an electrical meter461,496 meters
in City Light service territory

Power Transmission and Distribution

Graphic showing how power is transmitted from a dam to a home

  1. Power is generated from the dam and powerhouse
  2. Substation transformer steps up the voltage for transmission
  3. Transmission lines carry electricity long distances
  4. Neighborhood substation transformer steps down voltage
  5. Distribution lines carry electricity to residents
  6. Transformers on poles step down electricity before entering residence
  7. Service lines deliver power from the pole to the residence