Balanced Portfolio Project Sooner Cleveland 345 k V

Balanced Portfolio Project Sooner - Cleveland 345 k. V Original Cost Estimate $33, 530, 000 Q 3 2012 $58, 906, 000 Latest Update Cost Variance % Change $59, 880, 000 $26, 350, 000 78. 6% Seminole - Muskogee 345 k. V $129, 000 $161, 700, 000 $32, 700, 000 25. 3% Tuco - Woodward 345 k. V $227, 727, 500 $328, 733, 021 $328, 645, 462 $101, 917, 692 44. 3% Iatan - Nashua 345 k. V Spearville - Post Rock - Axtell 345 k. V $54, 444, 000 $236, 557, 015 $64, 800, 000 $10, 356, 000 19. 0% $224, 000, 000 ($12, 557, 015) -5. 3% Swissvale - Stilwell Tap 345 k. V $2, 000, 000 $1, 922, 840 ($77, 160) -3. 9% Gracemont Substation $8, 000 $15, 200, 000 $15, 966, 210 $7, 966, 210 99. 6% $855, 339, 021 $857, 002, 071 $165, 743, 556 24. 0% Total $691, 258, 515 1

Tuco - Stateline 345 k. V Ckt 1 (SPS) Original Cost Estimate In-Service Date $122, 597, 500 5/19/2014 Expenditure to Date 38. 9% $4, 195, 822 2. 5% 7% Environmental Studies 50% 0% Engineering 38% 95% Permit Status 35% Latest Cost Estimate Cost Variance $170, 247, 072 $47, 649, 572 Material Procurement Percentage of Construction Completion % Change % of Latest Estimate Siting and Routing CREZ projects in same area elevating ROW costs Cost Estimate 13% increase in line length (178 to 202. 4 miles) Increase Justifications 43% increase in number of corner/angle structures Switch from in-house engineering and construction to consultants and contractors 30% 30% 10% Increased costs of purchasing easements (due to recent awards for CREZ projects) Potential Future Cost Increase Factors Number of corner/angle structures may increase for minor route adjustments Labor/material costs could increase due to steel/aluminum price fluctuations and availability of contract labor In-service date may change due to length of time to acquire easements Final Pedestrian survey could cause archeological or biological mitigation requirements 2

Tuco 345/230 k. V Transformer Ckt 2 (SPS) Original Cost Estimate In-Service Date $11, 250, 000* 3/31/2013 % Change Expenditure to Date % of Latest Estimate 37. 8% $7, 086, 641 45. 7% 7% Environmental Studies N/A Latest Cost Estimate Cost Variance $15, 498, 390 $4, 248, 390 *SPS estimate at time of Modified NTC issuance Material Procurement Percentage of Construction Completion Siting and Routing 25% Engineering 85% N/A Permit Status N/A Cost Estimate None provided Increase Justifications Potential Future Cost Increase Factors None mentioned 3