1. WECC Staff Conference Call December 15, 2010 Substation Cost Revisions

2. Cost Estimates Currently Available From E3s capital cost estimating tool: linklink 2

3. Enhancements Desired Distinguish between substation work required in existing versus new substations Provide cost estimate for transformers that may be required Other cost breakouts needed? 3

4. Using the New Cost Estimates External to the existing E3 spreadsheet? Determine for each project, use appropriate cost estimate: Terminations: #1 – Existing/New Substation? oTransformers required? #2 – Existing/New Substation? oTransformers required? Intermediate Substations: #1 – Existing/New Substation? oTransformers required? Repeat for n intermediate substations Simple approach, so does this improve our cost estimates? 4