Power Supply Outlook Update

A snapshot of Northwest power supply and electricity demand

Columbia River Runoff volume forecast

Updated biweekly between December and July

January to July runoff at the Dalles Dam is at 101% of the 30-year average from 1981-2010.

For more narrative information, see the National Weather Service Northwest River Forecast Center. For more data including runoff history, see BPA Hydrology.

Figures in million acre-feet Low Avg High
Current forecast (2020-09-21) 102
30-year history (1981-2010) 53 101 159

Reservoir elevations and flows

Updated daily

Elevations for major U.S. reservoirs

Data for
09/20
Elevation
(ft)
Normal Full
Pool (ft)
Avg 09/20 Elevation (ft)
for last 10 years
Hungry Horse 3550.9 3561.0 3549.0
Libby 2447.1 2459.0 2444.9
Grand Coulee 1281.0 1290.0 1281.8
Dworshak 1522.4 1600.0 1521.0
courtesy of U of W's DART program

River flow at key Lower Snake and Columbia dams

Data for
09/20
Outflow
(kcfs)
Avg 09/20 Outflow (kcfs)
for last 10 years
Lower Granite 21.0 23.1
The Dalles 79.1 87.8
courtesy of U of W's DART program

Power flow in and out of the region

Updated daily (current period 21AUG20-20SEP20)

This shows how much average power has been imported and exported in the last 30 days.

For more information, see Bonneville's intertie analyses

IntertieAvg power flowDirection
California (AC+DC) 5,195 mw export to California
Canada (BC) -1,187 mw import from Canada
Total 4,008 mw export

Acronyms and glossary

  • DSI - Direct Service Industry, like aluminum processors
  • intertie - high-voltage transmission lines connecting the Northwest to other regions
  • KCFS - thousand cubic feet per second
  • load - demand
  • MAF - million acre-feet
  • MW - megawatt
  • NMFS - National Marine Fisheries Service

This website was archived in 2018. Go to this page on the current site or keep browsing.

Contact Eric Schrepel with any questions or requests, thank you.