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In our 10-Year Assessments and Updates, projects are identified that address reliability issues, transmission service issues, generation interconnections or some distribution interconnections, or a combination of two or more of the above. In general, these projects address system performance issues per the governing system planning criteria. We have numerous other projects under way or under evaluation that address other issues, including obsolete substation equipment, line facilities in poor condition, line relocations and most distribution interconnections. The projects referenced in the project tables PR-2 through PR-27 include only those projects that address system performance issues.

To facilitate an understanding of the status of the various future projects, we classify projects into one of three possible categories – Planned, Proposed or Provisional. Each classification has specific criteria based on the status of the project as outlined below:

Planned projects:

• ATC planning is complete;
• if required, we have applied for regulatory approvals, which may be pending or have been issued;
• project may be under construction or in construction planning phase; and
• project typically is included in power flow models used to analyze transmission service requests.

Proposed projects:

• ATC planning is not complete;
• ATC has not yet pursued regulatory approvals;
• project represents ATC’s preliminary preferred project alternatives from a system performance perspective; and
• project typically is not included in power flow models used to analyze transmission service requests.

Provisional projects:

• ATC planning is not complete;
• ATC has not yet sought regulatory approvals;
• project does not necessarily represent ATC’s preliminary preferred project alternative, but reflects a placeholder project designation; and
• project is not included in power flow models used to analyze transmission service requests.

In the 2001-2006 10-Year Assessments and Updates, we identified or assumed responsibility for 591 projects that address system performance issues. Figure PR-6 illustrates the status of all Planned, Proposed, and Provisional projects from 2001-2006. Regarding Figure PR-6, it is worthwhile to note that:

• ATC has completed 181 projects and another 14 are under construction. Notable projects most recently completed are listed in Table PR-1. Projects under construction range from capacitor bank installations to the Arrowhead-Weston/Gardner Park transmission line project.
• 85 projects have been replaced with alternate project solutions. It is not unusual that the status of certain projects will change or evolve since customer needs and uses of the transmission system continually are changing.
• ATC canceled 112 projects that were identified in previous Assessment reports. Due to changing needs and up-to-date information, these projects were determined unnecessary. Most of these projects were relatively minor projects, involving only replacement of equipment at existing substations.
• 199 future projects are in various stages of evaluation or development (Planned, Proposed or Provisional).