Your PUD Getting Started

To get started, please be sure to review the Legal Disclaimer. Next, please submit your contact information at Submit Your Contact Info. We will rely on this information for our e-mailings, mailers, and phone directory. Also, be sure to visit the Event Calendar to stay on track with important due dates and events. If you have any questions about the Power Auction, please contact us at SliceAuction@chelanpud.org.

Here is a quick overview of the data files found within this site. Files can be accessed by clicking on the file name displayed below, or by visiting the Slice Data page. Each Excel file also has an explanation of the data.

Rocky Reach Hydro Data 1990-2011 and Rock Island Hydro Data 1990-2011

These files contain multiple data sets. The first sheet contains the project net inflow, available capacity and available generation. The project net inflow is expressed in MWh and is the amount of energy entering the Project Paper Pond. All data has been adjusted for encroachments, but NOT CEAEA energy. Capacity data is reflective of operations, so outages of any kind are reflected.

Historical project minimum capabilities and recent minimum energy requirements during high flows are contained in this file also. See notes on "Project_Minimum_Capabilities" and "Min_Energy_Requirement" tabs in the excel file for explanation of this data.

Historical month average CEAEA is also found in this file. The Rocky Reach and Rock Island projects are obligated to return a predetermined amount of energy on heavy load hours to BPA under the Columbia River Treaty (see below for explanation).

2009 Hourly Flow Generation Data

Provides 2009 total flow, turbine flow and project generation along with an explanation and example of the hydro generation equation that is used to estimate the amount of generation given flow. Note that the generation is metered at the switchyard and does not account for encroachments or CEAEA energy.

1990-2010 Hourly Flow Generation Data

Provides 1990-2010 hourly total flow, turbine flow, spill flow and project generation along with an explanation and example of the hydro generation equation that is used to estimate the amount of generation given flow. Note that the generation is metered at the switchyard and does not account for encroachments or CEAEA energy.

District Hydro Projects

Provides various project and unit capacity numbers. There can be many numbers used to describe the capacity or capability of the hydro projects. This documents the various ways to calculate the capacity or capability at the projects.

Rocky Reach Hydroregulation and Rock Island Hydroregulation

Tables that show an estimate of the project net generation assuming a repeat of natural flows from 1928-1998, assuming current day local and regional non-power constraints. The data is in average megawatts for the periods shown. Please note that August and April are split into two half-months.

Rocky Reach Encroachment Data 1990-2010 and Rock Island Encroachment Data 1990-2010

These files contain historical encroachment data for the time period 1990-2010. The Rocky Reach project receives encroachment energy from the downstream Rock Island project and delivers encroachment energy upstream to the Lake Chelan project. The net effect is a net gain in energy to Rocky Reach. The Rock Island project receives encroachment energy from the downstream Wanapum project and delivers encroachment energy to the upstream Rocky Reach project. The net effect is a net gain in energy to Rock Island.

Rocky Reach Forced Outages and Rock Island Forced Outages

These files contain the date, time, duration, unit outage, and reason of all unplanned or forced outages lasting over five (5) hours.

Rocky Reach Planned Outages and Rock Island Planned Outages

The District plans ongoing maintenance/overhaul/rehab outages for many years into the future as part of the District's asset management program. These files contain the date, duration, unit outage, and reason for the planned outages.

Rocky Reach Spill Evaluator and Rock Island Spill Evaluator

Given that projected fish spill programs contain a degree of uncertainty, these calculators allow the user to vary the fish spill percentage at a project and observe the impact to generation. Although absolute project generation levels net of encroachments are calculated, they are not intended to represent actual generation that would occur at a specific fish spill level.

Historic Fish Spill Data

This file lists the historical fish spill levels expressed as a percentage of total project flow for spring and summer fish spill for the time period of 1995-2010. The spring fish spill time period typically begins in mid April and runs through early June. The summer fish spill time period typically begins in early June and runs through mid August.

In addition to spilling for fish, spill can also be affected by total dissolved gas (TDG) levels. When gases reach a certain level, spill may be reduced to stay within an acceptable band as set by the Washington Department of Ecology.

Fish Spill Projections 2011-2016

This file lists the District's 'best estimate' for spring and summer fish spill and studies at Rocky Reach and Rock Island. The file contains both a written description and table showing best estimates for project spill and alternative spill likelihoods if juvenile survival standards are not met.

Operations Overview

This file describes the Hourly Coordination objectives, operating strategies, megawatt accounting and other operational issues.

Canadian Entitlement Allocation Agreement (Canadian Treaty)

The Columbia River Treaty (the "Treaty"), a 60-year treaty between the United States and Canada relating to cooperative development of the water resources of the Columbia River basin, was placed in effect on September 16, 1964. Pursuant to the Treaty, Canada has constructed three water storage facilities in Canada and is entitled, among other things, to receive one-half of the downstream power benefits defined in the Treaty.

In general, the Treaty and its implementing agreements provide a means to coordinate the operation of all major power plants and transmission systems in the Northwest for the mutual benefit of the participants and a method to obtain and distribute the increased power benefits resulting from the construction of the Canadian water storage facilities. These agreements expired in 2003. The parties to the Pacific Northwest Coordination Agreement have negotiated a replacement ageement which extends the term to 2024.

The return of energy to Canada, via a schedule to BPA is referred to as CEAEA which is the abbreviation for Canadian Entitlement Allocation Extended Agreement.

The Rocky Reach and Rock Island projects are obligated to return a predetermined amount of energy on heavy load hours under the extended agreement. This file contains this return energy schedule.