Bonneville Power Administration
Transmission Services

http://www.transmission.bpa.gov

Total Transmission System Load (TTSL)

TTSL is an approximation of loading on any part of the BPA transmission system, based on federal and non-federal generation within the BPA control area, and interchange and wheeling onto the system. It is unadjusted for temperature or streamflow conditions. The date and time of the monthly TTSL peak is used for billing purposes. TTSL is not a typical "end-use" load measure, and is not used as a "system load" measure for any formal regulatory reporting. TTSL data are unavailable prior to 1/1/07. Source: RODS acct 272500.

Total Transmission System Load, Monthly Peaks, Beginning Jan-07
Total Transmission System Load, Rolling 60-Day Report
Data and plot of TTSL by hour over the last 60 days, including date, time,
and amount of peak for current month and prior month. Updated daily.
Total Transmission System Load, Hourly Data, beg Jan07, updated monthly

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