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 105% 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 (2014-04-21) 106
30-year history (1981-2010) 53 101 159

Reservoir elevations and flows

Updated daily

Elevations for major U.S. reservoirs

Data for
April 21
Normal Full
Pool (ft)
Avg Apr 21 Elevation
for last 10 years (ft)
Hungry Horse 3501.1 3561.0 3520.5
Libby NA 2459.0 NA
Grand Coulee 1240.0 1290.0 1251.9
Dworshak 1486.6 1600.0 1532.8
courtesy of U of W's DART program

River flow at key Lower Snake and Columbia dams

Data for
April 21
Daily Outflow
Avg Apr 21 Outflow
for last 10 years (kcfs)
Lower Granite 73.4 73.9
The Dalles 232.6 219.0
courtesy of U of W's DART program

Power flow in and out of the region

Updated daily (current period 23MAR14-21APR14)

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) 5021 mw export to California
Canada (BC) 978 mw export to Canada
Total 5999 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
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