1 ercot lrs detail sample design pwg presentation april 24, 2007

1

ERCOT

LRS Detail

Sample Design

PWG Presentation

April 24, 2007

2

Overview

• High-level Sample Design Review

• Detail Sample Design and Allocation to TDSPs

• Sample Point Retention

• New Primary and Backup Sample Point Selection

3

Final Round 2 High Level Design

• Total sample size 9,160

Sample Cells RESHIWR RESLOWR BUSHILF BUSMEDLF BUSLOLF BUSNODEM TotalCOAST 560 600 120 400 300 120 2,100 EAST 120 120 120 120 120 120 720

FWEST 120 120 120 120 120 120 720 NCENT 600 600 120 400 400 120 2,240 NORTH 120 120 120 120 120 120 720 SCENT 120 120 120 120 120 120 720 SOUTH 360 160 120 180 120 120 1,060 WEST 120 120 120 120 120 120 720 Total 2120 1960 960 1580 1420 960 9,000

Round 2 Sample

Sample Cells BUSHILF BUSMEDLF BUSLOLF TotalFWEST 40 40 40 120NORTH 40 0 0 40

Total 80 40 40 160

Primary Voltage Strata

4

Detail Sample Design Inputs

• Error Ratios in each sample cell – Median value used within each cell

• Preliminary sample size in each cell• Load factor in each cell (from LRS results)• Population data at the ESIID level including

annualized kWh to be used as the basis for stratification within cells

5

Detail Sample Design Inputs

Ptype_WzoneSample

SizePrecision Load Factor Error Ratio

BUSHILF_COAST 120 3.0% 75.0% 0.2BUSHILF_EAST 120 2.9% 67.3% 0.19BUSHILF_FWEST 120 5.7% 81.0% 0.38BUSHILF_NCENT 120 3.8% 68.3% 0.25BUSHILF_NORTH 120 3.5% 74.2% 0.23BUSHILF_SCENT 120 2.9% 72.8% 0.19BUSHILF_SOUTH 120 3.9% 76.3% 0.26BUSHILF_WEST 120 2.9% 76.7% 0.19BUSLOLF_COAST 400 7.4% 38.8% 0.9BUSLOLF_EAST 120 10.2% 38.0% 0.68BUSLOLF_FWEST 120 21.2% 33.8% 1.41BUSLOLF_NCENT 400 7.6% 29.3% 0.92BUSLOLF_NORTH 120 12.6% 37.6% 0.84BUSLOLF_SCENT 120 11.7% 34.3% 0.78BUSLOLF_SOUTH 180 13.7% 39.6% 1.12BUSLOLF_WEST 120 13.4% 36.3% 0.89BUSMEDLF_COAST 300 5.1% 54.7% 0.54BUSMEDLF_EAST 120 8.6% 54.2% 0.57BUSMEDLF_FWEST 120 12.9% 47.6% 0.86BUSMEDLF_NCENT 400 4.4% 52.9% 0.54BUSMEDLF_NORTH 120 10.8% 49.8% 0.72BUSMEDLF_SCENT 120 5.7% 52.8% 0.38BUSMEDLF_SOUTH 120 8.3% 56.9% 0.55BUSMEDLF_WEST 120 6.9% 55.6% 0.46BUSNODEM_COAST 120 19.2% 51.2% 1.28BUSNODEM_EAST 120 14.6% 47.0% 0.97BUSNODEM_FWEST 120 15.2% 49.4% 1.01BUSNODEM_NCENT 120 16.4% 56.8% 1.09BUSNODEM_NORTH 120 17.3% 41.4% 1.15BUSNODEM_SCENT 120 17.6% 43.3% 1.17BUSNODEM_SOUTH 120 15.2% 23.7% 1.01BUSNODEM_WEST 120 15.3% 44.1% 1.02

Ptype_WzoneSample

SizePrecision Load Factor Error Ratio

RESHIWR_COAST 560 6.3% 32.9% 0.9RESHIWR_EAST 120 12.9% 30.1% 0.86RESHIWR_FWEST 120 14.0% 30.3% 0.93RESHIWR_NCENT 600 6.5% 27.9% 0.97RESHIWR_NORTH 120 13.4% 25.0% 0.89RESHIWR_SCENT 120 13.1% 29.5% 0.87RESHIWR_SOUTH 360 7.7% 44.0% 0.89RESHIWR_WEST 120 13.4% 28.5% 0.89RESLOWR_COAST 600 4.4% 32.9% 0.65RESLOWR_EAST 120 10.7% 34.9% 0.71RESLOWR_FWEST 120 12.2% 30.1% 0.81RESLOWR_NCENT 600 4.8% 32.3% 0.71RESLOWR_NORTH 120 11.6% 31.1% 0.77RESLOWR_SCENT 120 11.1% 32.9% 0.74RESLOWR_SOUTH 160 10.0% 21.9% 0.77RESLOWR_WEST 120 10.7% 32.1% 0.71

6

Determine Stratum Boundaries

• Model Based sample design was used to determine stratum boundaries and sample allocation to strata (equal allocation results)

• Number of strata within a cell was specified based on the cell total sample size

– Minimum sample size within a stratum is 40 (3 strata for cells with 120 total points)

– Error Ratios in each sample cell – Maximum number of strata is 5

• Model Based stratification occasionally resulted in additional certainty strata (100% sampling within the stratum)

– Caused by ESIIDs with unusually high or low usage values– Eliminated by changing the boundary to include the ESIIDs in the

adjacent stratum• Primary voltage ESIIDs were included

in the population for all cells except the 4 identified as having significant proportion of the load

• These four were treated as separate strata within each cell

Profile Type WZoneEnergy Percent

ESIID Count

BUSHILF FWEST 47.1 782BUSHILF NORTH 4.8 115BUSLOLF FWEST 5.2 936BUSMEDLF FWEST 16.0 865

Note:Oil/Gas ESIID's supplied by AEP and TXU are removed from analysis

CELLS WITH AT LEAST 4 PERCENTPRIMARY VOLTAGE ENERGY

7

Determine TDSP Sample Allocation

• Determine percent of ESIIDs within each stratum by TDSP

• Assign proportional share of sample points to each TDSP

• Apply TDSP valid data factor to their share of the sample points and round up to the nearest whole number to account for expected valid data collection rate

TDSP Simple AverageAEPC 95%AEPN 96%CNP 97%Nueces N/ASharyland N/ATXU-ED 97%TNMP 94%

8

Sample Point Retention

• Retainable Round 1 sample points for each TDSP were identified by cell and stratum

• TXUED new load research sample points also were identified by cell and stratum

• The number of additional sample points needed by cell and stratum was determined for each TDSP, within each cell and stratum :

– For TXUED:ERCOT new points = required sample size – retained points – TXUED new points

– For all other TDSPs:ERCOT new points = required sample size – retained points

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Sample Point Lists

• Three sample point lists will be provided to TDSPs for both the RES and BUS profile groups

– Retainable Round 1 sample points for each TDSP were identified by cell and stratum• The number of new sample points needed by cell and stratum was determined for

each TDSP – TXUED new load research sample points also were identified by cell and stratum– within each cell and stratum :

ERCOT new points = required sample size – retained points

• The number of retained sample points by cell and stratum was determined for each TDSP :

Retained Sample Points = LRS Rnd1 Retainable Points + (TXUED new LR points)**

• A list of Backup (Replacement) Sample Points by cell and stratum

# of Backup Sample points = Max(25, Required Count * 15)

** Applied to TXUED proportionate share of required sample points

10

Retainable Round 1 Sample Points

• Table shows retainable secondary sample points only• Non retained sample points may be selected for the round 2 sample• TDSPs should consider waiting until round 2 sample list is provided

to start recorder removal

COAST EAST FWEST NCENT NORTH SCENT SOUTH WESTRESHI 40 42 43 93 41 40 41 44RESLO 45 38 50 70 56 44 31 45BUSHI 17 16 12 21 22 16 15 18BUSMED 35 51 44 54 40 88 34 37BUSLO 75 84 76 77 76 78 80 68BUSNODEM 98 82 87 179 91 70 23 38

310 313 312 494 326 336 224 250

ALL TDSPS -- PROFILE_TYPE 2004 - 2007

RESHI 384 RESLO 379 BUSHI 137 BUSMED 383 BUSLO 614 BUSNODEM 668 Points same as 2004 2,565 Ttl Points no O & G 3,452 % POINTS - Eligible 74.3%

PROFILE_TYPE 2004 & 2007

CNP TXU-ED TNMP AEPC AEPNRESHI 35 249 7 58 35RESLO 43 239 9 41 47BUSHI 17 74 5 21 20BUSMED 33 249 8 49 44BUSLO 68 348 26 113 59BUSNODEM 92 492 21 29 34

288 1651 76 311 239

PROFILE_TYPE 2004 - 2007

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Round 2 – Required RESHI Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRH_COAST 1 9,320 108 0 5 4 0 0 0 117RH_COAST 2 13,328 106 0 6 5 0 0 0 117RH_COAST 3 17,883 103 0 9 6 0 0 0 118RH_COAST 4 23,929 101 0 10 6 0 0 0 117RH_COAST 5 761,337 103 0 10 5 0 0 0 118RH_EAST 1 15,617 0 41 1 0 0 0 0 42RH_EAST 2 22,717 0 41 1 0 0 0 0 42RH_EAST 3 387,949 0 41 1 0 0 0 0 42RH_FWEST 1 12,615 0 33 4 0 6 0 0 43RH_FWEST 2 20,714 0 36 2 0 4 0 0 42RH_FWEST 3 236,297 0 38 2 0 3 0 0 43RH_NCENT 1 10,870 0 119 5 0 1 0 0 125RH_NCENT 2 15,344 0 120 5 0 1 0 0 126RH_NCENT 3 19,834 0 120 4 0 1 0 0 125RH_NCENT 4 25,646 0 120 4 0 1 0 0 125RH_NCENT 5 494,760 0 121 3 0 1 0 0 125RH_NORTH 1 15,167 0 36 3 0 4 0 0 43RH_NORTH 2 22,287 0 36 3 0 3 0 0 42RH_NORTH 3 168,298 0 38 3 0 2 0 0 43RH_SCENT 1 13,292 0 36 0 6 0 0 0 42RH_SCENT 2 20,323 0 35 0 7 0 0 0 42RH_SCENT 3 148,944 0 36 0 7 0 0 0 43RH_SOUTH 1 11,085 0 0 0 75 0 1 1 77RH_SOUTH 2 15,276 0 0 0 75 0 1 1 77RH_SOUTH 3 19,318 0 0 0 74 0 1 2 77RH_SOUTH 4 24,825 0 0 0 74 0 1 2 77RH_SOUTH 5 961,293 0 0 0 73 0 1 3 77RH_WEST 1 13,235 0 4 0 10 29 0 0 43RH_WEST 2 19,506 0 4 0 10 29 0 0 43RH_WEST 3 155,929 0 5 0 9 28 0 0 42RH Total 521 1060 81 446 113 5 9 2235

Required Sample Size

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Round 2 – Required RESLO Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRL_COAST 1 10,379 116 0 6 4 0 0 0 126RL_COAST 2 14,121 116 0 7 3 0 0 0 126RL_COAST 3 18,014 115 0 7 3 0 0 0 125RL_COAST 4 24,018 114 0 8 3 0 0 0 125RL_COAST 5 1,071,505 116 0 7 2 0 0 0 125RL_EAST 1 11,703 0 41 1 0 0 0 0 42RL_EAST 2 17,862 0 41 1 0 0 0 0 42RL_EAST 3 345,984 0 42 1 0 0 0 0 43RL_FWEST 1 10,750 0 31 6 0 6 0 0 43RL_FWEST 2 16,418 0 37 3 0 2 0 0 42RL_FWEST 3 676,825 0 38 2 0 2 0 0 42RL_NCENT 1 11,220 0 118 5 0 2 0 0 125RL_NCENT 2 15,288 0 120 4 0 1 0 0 125RL_NCENT 3 19,904 0 120 4 0 1 0 0 125RL_NCENT 4 27,812 0 121 3 0 1 0 0 125RL_NCENT 5 11,602,406 0 123 2 0 1 0 0 126RL_NORTH 1 11,045 0 31 4 0 8 0 0 43RL_NORTH 2 16,436 0 34 4 0 6 0 0 44RL_NORTH 3 440,838 0 35 3 0 5 0 0 43RL_SCENT 1 12,305 0 37 0 5 0 0 0 42RL_SCENT 2 17,657 0 39 0 3 0 0 0 42RL_SCENT 3 343,952 0 39 0 3 0 0 0 42RL_SOUTH 1 11,053 0 0 0 55 0 1 2 58RL_SOUTH 2 17,421 0 0 0 55 0 1 2 58RL_SOUTH 3 1,354,924 0 0 0 53 0 1 4 58RL_WEST 1 10,313 0 5 0 7 31 0 0 43RL_WEST 2 15,395 0 4 0 6 33 0 0 43RL_WEST 3 291,006 0 4 0 7 32 0 0 43RL Total 577 1060 78 209 131 3 8 2066


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Round 2 – Required BUSHI Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBH_COAST 1 441,071 37 0 3 2 0 0 0 42BH_COAST 2 1,293,830 39 0 2 2 0 0 0 43BH_COAST 3 4,412,389 39 0 2 2 0 0 0 43

BH_EAST 1 443,538 0 41 2 0 0 0 0 43BH_EAST 2 1,340,700 0 41 1 0 0 0 0 42BH_EAST 3 4,076,044 0 42 0 0 0 0 0 42

BH_FWEST 1 321,115 0 16 20 0 7 0 0 43BH_FWEST 2 1,079,091 0 31 5 0 7 0 0 43BH_FWEST 3 4,740,043 0 32 7 0 4 0 0 43BH_FWEST 4 Primary 0 31 9 0 0 0 0 40

BH_NCENT 1 638,049 0 39 3 0 1 0 0 43BH_NCENT 2 2,047,120 0 41 2 0 1 0 0 44BH_NCENT 3 6,281,794 0 41 2 0 0 0 0 43

BH_NORTH 1 419,605 0 24 8 0 11 0 0 43BH_NORTH 2 1,184,833 0 34 3 0 6 0 0 43BH_NORTH 3 4,263,034 0 36 1 0 6 0 0 43BH_NORTH 4 Primary 0 15 2 0 3 0 0 20

BH_SCENT 1 496,743 0 26 0 16 0 0 0 42BH_SCENT 2 1,175,872 0 32 0 10 0 0 0 42BH_SCENT 3 4,327,466 0 33 0 9 0 0 0 42

BH_SOUTH 1 426,225 0 0 0 41 0 1 1 43BH_SOUTH 2 1,193,358 0 0 0 42 0 0 1 43BH_SOUTH 3 4,379,118 0 0 0 41 0 1 1 43

BH_WEST 1 373,859 0 3 0 9 31 0 0 43BH_WEST 2 1,201,998 0 4 0 7 32 0 0 43BH_WEST 3 3,633,600 0 8 0 4 30 0 0 42

BH Total 115 570 72 185 139 2 3 1086


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Round 2 – Required BUSLO Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBL_COAST 1 36,803 68 0 8 8 0 0 0 84BL_COAST 2 76,708 75 0 5 5 0 0 0 85BL_COAST 3 162,154 76 0 4 4 0 0 0 84BL_COAST 4 438,285 77 0 4 4 0 0 0 85BL_COAST 5 2,644,911 77 0 4 3 0 0 0 84BL_EAST 1 47,306 0 41 1 0 0 0 0 42BL_EAST 2 133,097 0 41 1 0 0 0 0 42BL_EAST 3 2,531,289 0 41 1 0 0 0 0 42BL_FWEST 1 50,968 0 29 9 0 5 0 0 43BL_FWEST 2 151,471 0 35 4 0 3 0 0 42BL_FWEST 3 1,992,002 0 35 4 0 4 0 0 43BL_FWEST 4 Primary 0 31 7 0 2 0 0 40BL_NCENT 1 35,027 0 76 6 0 1 0 0 83BL_NCENT 2 67,610 0 80 3 0 1 0 0 84BL_NCENT 3 130,177 0 80 3 0 1 0 0 84BL_NCENT 4 320,175 0 79 4 0 1 0 0 84BL_NCENT 5 2,874,742 0 80 4 0 1 0 0 85BL_NORTH 1 44,864 0 29 6 0 7 0 0 42BL_NORTH 2 129,249 0 34 3 0 6 0 0 43BL_NORTH 3 2,199,476 0 34 3 0 5 0 0 42BL_SCENT 1 48,528 0 26 0 16 0 0 0 42BL_SCENT 2 145,787 0 34 0 8 0 0 0 42BL_SCENT 3 1,866,350 0 34 0 8 0 0 0 42BL_SOUTH 1 26,807 0 0 0 47 0 1 1 49BL_SOUTH 2 63,440 0 0 0 47 0 1 1 49BL_SOUTH 3 195,493 0 0 0 47 0 1 1 49BL_SOUTH 4 1,976,494 0 0 0 47 0 1 1 49BL_WEST 1 46,819 0 4 0 12 27 0 0 43BL_WEST 2 141,207 0 5 0 8 30 0 0 43BL_WEST 3 1,392,143 0 4 0 7 32 0 0 43BL Total 373 852 84 271 126 4 4 1714


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Round 2 – Required BUSMED Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBM_COAST 1 110,168 55 0 5 4 0 0 0 64BM_COAST 2 225,150 57 0 3 3 0 0 0 63BM_COAST 3 465,486 57 0 4 3 0 0 0 64BM_COAST 4 991,928 58 0 3 2 0 0 0 63BM_COAST 5 6,067,086 59 0 2 2 0 0 0 63BM_EAST 1 160,718 0 41 1 0 0 0 0 42BM_EAST 2 473,416 0 41 1 0 0 0 0 42BM_EAST 3 3,068,772 0 42 1 0 0 0 0 43BM_FWEST 1 133,915 0 25 7 0 11 0 0 43BM_FWEST 2 416,064 0 33 6 0 4 0 0 43BM_FWEST 3 2,961,999 0 37 3 0 3 0 0 43BM_FWEST 4 Primary 0 35 5 0 0 0 0 40BM_NCENT 1 123,899 0 78 4 0 2 0 0 84BM_NCENT 2 268,172 0 80 3 0 1 0 0 84BM_NCENT 3 527,803 0 80 3 0 1 0 0 84BM_NCENT 4 1,066,964 0 80 3 0 1 0 0 84BM_NCENT 5 5,726,810 0 80 3 0 0 0 0 83BM_NORTH 1 162,431 0 26 3 0 14 0 0 43BM_NORTH 2 516,298 0 35 2 0 5 0 0 42BM_NORTH 3 3,319,034 0 40 1 0 2 0 0 43BM_SCENT 1 163,545 0 34 0 9 0 0 0 43BM_SCENT 2 515,097 0 37 0 5 0 0 0 42BM_SCENT 3 2,769,928 0 39 0 3 0 0 0 42BM_SOUTH 1 143,302 0 0 0 42 0 1 1 44BM_SOUTH 2 423,020 0 0 0 42 0 1 1 44BM_SOUTH 3 5,838,657 0 0 0 42 0 1 1 44BM_WEST 1 136,764 0 2 0 5 36 0 0 43BM_WEST 2 447,213 0 4 0 8 31 0 0 43BM_WEST 3 2,857,794 0 2 0 6 34 0 0 42BM Total 286 871 63 176 145 3 3 1547


16

Round 2 – Required BUSNODEM Sample Size

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBN_COAST 1 7,370 39 0 2 2 0 0 0 43BN_COAST 2 17,021 41 0 1 1 0 0 0 43BN_COAST 3 11,852,233 41 0 1 1 0 0 0 43BN_EAST 1 6,610 0 41 1 0 0 0 0 42BN_EAST 2 15,338 0 41 1 0 0 0 0 42BN_EAST 3 525,911 0 41 1 0 0 0 0 42BN_FWEST 1 6,182 0 32 4 0 7 0 0 43BN_FWEST 2 14,783 0 35 2 0 6 0 0 43BN_FWEST 3 6,330,786 0 38 2 0 3 0 0 43BN_NCENT 1 7,360 0 40 2 0 1 0 0 43BN_NCENT 2 16,226 0 41 2 0 1 0 0 44BN_NCENT 3 2,115,365 0 41 1 0 1 0 0 43BN_NORTH 1 5,812 0 31 3 0 9 0 0 43BN_NORTH 2 13,564 0 36 2 0 5 0 0 43BN_NORTH 3 800,482 0 40 2 0 1 0 0 43BN_SCENT 1 7,242 0 36 0 6 0 0 0 42BN_SCENT 2 15,424 0 40 0 2 0 0 0 42BN_SCENT 3 234,066 0 42 0 1 0 0 0 43BN_SOUTH 1 3,917 0 0 0 41 0 1 2 44BN_SOUTH 2 8,053 0 0 0 40 0 1 3 44BN_SOUTH 3 142,741 0 0 0 34 0 1 8 43BN_WEST 1 4,191 0 6 0 5 32 0 0 43BN_WEST 2 8,375 0 6 0 4 33 0 0 43BN_WEST 3 2,707,142 0 14 0 2 27 0 0 43BN Total 121 601 27 139 126 3 13 1030


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Round 2 – RESHI Retained Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRH_COAST 1 9,320 8 2 10RH_COAST 2 13,328 12 12RH_COAST 3 17,883 5 2 7RH_COAST 4 23,929 6 6RH_COAST 5 761,337 4 1 5RH_EAST 1 15,617 15 15RH_EAST 2 22,717 16 16RH_EAST 3 387,949 19 19RH_FWEST 1 12,615 12 2 1 15RH_FWEST 2 20,714 11 1 1 13RH_FWEST 3 236,297 15 1 16RH_NCENT 1 10,870 66 66RH_NCENT 2 15,344 41 41RH_NCENT 3 19,834 38 38RH_NCENT 4 25,646 22 22RH_NCENT 5 494,760 21 21RH_NORTH 1 15,167 13 13RH_NORTH 2 22,287 12 2 14RH_NORTH 3 168,298 15 1 1 17RH_SCENT 1 13,292 17 1 18RH_SCENT 2 20,323 14 2 16RH_SCENT 3 148,944 8 2 10RH_SOUTH 1 11,085 9 9RH_SOUTH 2 15,276 6 6RH_SOUTH 3 19,318 10 10RH_SOUTH 4 24,825 7 7RH_SOUTH 5 961,293 9 9RH_WEST 1 13,235 2 4 13 19RH_WEST 2 19,506 1 1 8 10RH_WEST 3 155,929 3 1 11 15RH Total 35 361 7 57 35 0 0 495

Retained Sample Points

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Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRL_COAST 1 10,379 13 1 14RL_COAST 2 14,121 6 6RL_COAST 3 18,014 12 12RL_COAST 4 24,018 9 9RL_COAST 5 1,071,505 3 1 4RL_EAST 1 11,703 21 21RL_EAST 2 17,862 15 15RL_EAST 3 345,984 7 1 8RL_FWEST 1 10,750 13 2 15RL_FWEST 2 16,418 23 23RL_FWEST 3 676,825 16 16RL_NCENT 1 11,220 57 57RL_NCENT 2 15,288 42 42RL_NCENT 3 19,904 27 1 28RL_NCENT 4 27,812 18 18RL_NCENT 5 11,602,406 14 14RL_NORTH 1 11,045 20 3 5 28RL_NORTH 2 16,436 16 1 3 20RL_NORTH 3 440,838 14 2 16RL_SCENT 1 12,305 17 17RL_SCENT 2 17,657 14 1 15RL_SCENT 3 343,952 11 2 13RL_SOUTH 1 11,053 15 15RL_SOUTH 2 17,421 8 8RL_SOUTH 3 1,354,924 8 8RL_WEST 1 10,313 1 4 14 19RL_WEST 2 15,395 1 11 12RL_WEST 3 291,006 1 1 12 14RL Total 43 347 9 41 47 0 0 487


Round 2 – RESLO Retained Sample Points

19

Round 2 – BUSHI Retained Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBH_COAST 1 441,071 5 5BH_COAST 2 1,293,830 7 7BH_COAST 3 4,412,389 5 5

BH_EAST 1 443,538 6 6BH_EAST 2 1,340,700 6 6BH_EAST 3 4,076,044 4 4

BH_FWEST 1 321,115 3 1 4BH_FWEST 2 1,079,091 1 1 2BH_FWEST 3 4,740,043 2 1 1 4BH_FWEST 4 Primary 2 1 3

BH_NCENT 1 638,049 5 1 6BH_NCENT 2 2,047,120 12 12BH_NCENT 3 6,281,794 18 18

BH_NORTH 1 419,605 4 1 2 7BH_NORTH 2 1,184,833 7 7BH_NORTH 3 4,263,034 7 7BH_NORTH 4 Primary 0

BH_SCENT 1 496,743 5 5BH_SCENT 2 1,175,872 3 3BH_SCENT 3 4,327,466 5 1 6

BH_SOUTH 1 426,225 1 1BH_SOUTH 2 1,193,358 8 8BH_SOUTH 3 4,379,118 6 6

BH_WEST 1 373,859 6 6BH_WEST 2 1,201,998 2 4 6BH_WEST 3 3,633,600 1 1 3 5

BH Total 17 91 5 19 17 0 0 149


20

Round 2 – BUSLO Retained Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBL_COAST 1 36,803 21 3 1 25BL_COAST 2 76,708 11 1 1 13BL_COAST 3 162,154 9 9BL_COAST 4 438,285 17 17BL_COAST 5 2,644,911 10 1 11BL_EAST 1 47,306 30 1 31BL_EAST 2 133,097 29 1 30BL_EAST 3 2,531,289 17 17BL_FWEST 1 50,968 17 9 3 29BL_FWEST 2 151,471 23 1 1 25BL_FWEST 3 1,992,002 21 21BL_FWEST 4 Primary 5 5BL_NCENT 1 35,027 44 1 1 46BL_NCENT 2 67,610 21 2 23BL_NCENT 3 130,177 16 16BL_NCENT 4 320,175 21 1 22BL_NCENT 5 2,874,742 21 21BL_NORTH 1 44,864 26 3 3 32BL_NORTH 2 129,249 21 1 2 24BL_NORTH 3 2,199,476 20 1 21BL_SCENT 1 48,528 19 13 32BL_SCENT 2 145,787 17 3 20BL_SCENT 3 1,866,350 20 4 24BL_SOUTH 1 26,807 28 28BL_SOUTH 2 63,440 10 10BL_SOUTH 3 195,493 22 22BL_SOUTH 4 1,976,494 16 16BL_WEST 1 46,819 5 4 17 26BL_WEST 2 141,207 3 6 15 24BL_WEST 3 1,392,143 2 1 17 20BL Total 68 398 26 109 59 0 0 660


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Round 2 – BUSMED Retained Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBM_COAST 1 110,168 4 1 5BM_COAST 2 225,150 5 5BM_COAST 3 465,486 8 8BM_COAST 4 991,928 11 1 12BM_COAST 5 6,067,086 5 5BM_EAST 1 160,718 20 20BM_EAST 2 473,416 18 18BM_EAST 3 3,068,772 14 14BM_FWEST 1 133,915 8 1 2 11BM_FWEST 2 416,064 12 4 16BM_FWEST 3 2,961,999 15 1 2 18BM_FWEST 4 Primary 1 1BM_NCENT 1 123,899 25 25BM_NCENT 2 268,172 11 11BM_NCENT 3 527,803 14 2 1 17BM_NCENT 4 1,066,964 18 18BM_NCENT 5 5,726,810 21 21BM_NORTH 1 162,431 13 13BM_NORTH 2 516,298 14 3 17BM_NORTH 3 3,319,034 10 2 12BM_SCENT 1 163,545 24 2 26BM_SCENT 2 515,097 28 5 33BM_SCENT 3 2,769,928 25 4 29BM_SOUTH 1 143,302 11 11BM_SOUTH 2 423,020 12 12BM_SOUTH 3 5,838,657 11 11BM_WEST 1 136,764 6 6BM_WEST 2 447,213 1 2 14 17BM_WEST 3 2,857,794 1 14 15BM Total 33 293 8 49 44 0 0 427


22

Round 2 – BUSNODEM Retained Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBN_COAST 1 7,370 31 4 35BN_COAST 2 17,021 29 1 30BN_COAST 3 11,852,233 30 1 31BN_EAST 1 6,610 67 67BN_EAST 2 15,338 26 26BN_EAST 3 525,911 22 22BN_FWEST 1 6,182 52 6 1 59BN_FWEST 2 14,783 26 1 27BN_FWEST 3 6,330,786 28 1 29BN_NCENT 1 7,360 288 2 290BN_NCENT 2 16,226 74 1 75BN_NCENT 3 2,115,365 62 62BN_NORTH 1 5,812 40 3 6 49BN_NORTH 2 13,564 21 1 1 23BN_NORTH 3 800,482 31 31BN_SCENT 1 7,242 30 1 31BN_SCENT 2 15,424 24 24BN_SCENT 3 234,066 23 23BN_SOUTH 1 3,917 13 13BN_SOUTH 2 8,053 6 6BN_SOUTH 3 142,741 4 4BN_WEST 1 4,191 10 3 11 24BN_WEST 2 8,375 1 6 7BN_WEST 3 2,707,142 4 4 8BN Total 90 828 20 28 30 0 0 996


23

Round 2 – RESHI New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRH_COAST 1 9,320 100 0 5 2 0 0 0 107RH_COAST 2 13,328 94 0 6 5 0 0 0 105RH_COAST 3 17,883 98 0 9 4 0 0 0 111RH_COAST 4 23,929 95 0 10 6 0 0 0 111RH_COAST 5 761,337 99 0 10 4 0 0 0 113RH_EAST 1 15,617 0 26 1 0 0 0 0 27RH_EAST 2 22,717 0 25 1 0 0 0 0 26RH_EAST 3 387,949 0 22 1 0 0 0 0 23RH_FWEST 1 12,615 0 21 2 0 5 0 0 28RH_FWEST 2 20,714 0 25 1 0 3 0 0 29RH_FWEST 3 236,297 0 23 1 0 3 0 0 27RH_NCENT 1 10,870 0 53 5 0 1 0 0 59RH_NCENT 2 15,344 0 79 5 0 1 0 0 85RH_NCENT 3 19,834 0 82 4 0 1 0 0 87RH_NCENT 4 25,646 0 98 4 0 1 0 0 103RH_NCENT 5 494,760 0 100 3 0 1 0 0 104RH_NORTH 1 15,167 0 23 3 0 4 0 0 30RH_NORTH 2 22,287 0 24 1 0 3 0 0 28RH_NORTH 3 168,298 0 23 2 0 1 0 0 26RH_SCENT 1 13,292 0 19 0 5 0 0 0 24RH_SCENT 2 20,323 0 21 0 5 0 0 0 26RH_SCENT 3 148,944 0 28 0 5 0 0 0 33RH_SOUTH 1 11,085 0 0 0 66 0 1 1 68RH_SOUTH 2 15,276 0 0 0 69 0 1 1 71RH_SOUTH 3 19,318 0 0 0 64 0 1 2 67RH_SOUTH 4 24,825 0 0 0 67 0 1 2 70RH_SOUTH 5 961,293 0 0 0 64 0 1 3 68RH_WEST 1 13,235 0 2 0 6 16 0 0 24RH_WEST 2 19,506 0 3 0 9 21 0 0 33RH_WEST 3 155,929 0 2 0 8 17 0 0 27RH Total 486 699 74 389 78 5 9 1740

New Sample Points Needed

24

Round 2 – RESLO New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalRL_COAST 1 10,379 103 0 6 3 0 0 0 112RL_COAST 2 14,121 110 0 7 3 0 0 0 120RL_COAST 3 18,014 103 0 7 3 0 0 0 113RL_COAST 4 24,018 105 0 8 3 0 0 0 116RL_COAST 5 1,071,505 113 0 6 2 0 0 0 121RL_EAST 1 11,703 0 20 1 0 0 0 0 21RL_EAST 2 17,862 0 26 1 0 0 0 0 27RL_EAST 3 345,984 0 35 0 0 0 0 0 35RL_FWEST 1 10,750 0 18 4 0 6 0 0 28RL_FWEST 2 16,418 0 14 3 0 2 0 0 19RL_FWEST 3 676,825 0 22 2 0 2 0 0 26RL_NCENT 1 11,220 0 61 5 0 2 0 0 68RL_NCENT 2 15,288 0 78 4 0 1 0 0 83RL_NCENT 3 19,904 0 93 3 0 1 0 0 97RL_NCENT 4 27,812 0 103 3 0 1 0 0 107RL_NCENT 5 11,602,406 0 109 2 0 1 0 0 112RL_NORTH 1 11,045 0 11 1 0 3 0 0 15RL_NORTH 2 16,436 0 18 3 0 3 0 0 24RL_NORTH 3 440,838 0 21 3 0 3 0 0 27RL_SCENT 1 12,305 0 20 0 5 0 0 0 25RL_SCENT 2 17,657 0 25 0 2 0 0 0 27RL_SCENT 3 343,952 0 28 0 1 0 0 0 29RL_SOUTH 1 11,053 0 0 0 40 0 1 2 43RL_SOUTH 2 17,421 0 0 0 47 0 1 2 50RL_SOUTH 3 1,354,924 0 0 0 45 0 1 4 50RL_WEST 1 10,313 0 4 0 3 17 0 0 24RL_WEST 2 15,395 0 4 0 5 22 0 0 31RL_WEST 3 291,006 0 3 0 6 20 0 0 29RL Total 534 713 69 168 84 3 8 1579


25

Round 2 – BUSHI New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBH_COAST 1 441,071 32 0 3 2 0 0 0 37BH_COAST 2 1,293,830 32 0 2 2 0 0 0 36BH_COAST 3 4,412,389 34 0 2 2 0 0 0 38

BH_EAST 1 443,538 0 35 2 0 0 0 0 37BH_EAST 2 1,340,700 0 35 1 0 0 0 0 36BH_EAST 3 4,076,044 0 38 0 0 0 0 0 38

BH_FWEST 1 321,115 0 13 19 0 7 0 0 39BH_FWEST 2 1,079,091 0 30 5 0 6 0 0 41BH_FWEST 3 4,740,043 0 30 6 0 3 0 0 39BH_FWEST 4 Primary 0 29 8 0 0 0 0 37

BH_NCENT 1 638,049 0 34 2 0 1 0 0 37BH_NCENT 2 2,047,120 0 29 2 0 1 0 0 32BH_NCENT 3 6,281,794 0 23 2 0 0 0 0 25

BH_NORTH 1 419,605 0 20 7 0 9 0 0 36BH_NORTH 2 1,184,833 0 27 3 0 6 0 0 36BH_NORTH 3 4,263,034 0 29 1 0 6 0 0 36BH_NORTH 4 Primary 0 15 2 0 3 0 0 20

BH_SCENT 1 496,743 0 21 0 16 0 0 0 37BH_SCENT 2 1,175,872 0 29 0 10 0 0 0 39BH_SCENT 3 4,327,466 0 28 0 8 0 0 0 36

BH_SOUTH 1 426,225 0 0 0 40 0 1 1 42BH_SOUTH 2 1,193,358 0 0 0 34 0 0 1 35BH_SOUTH 3 4,379,118 0 0 0 35 0 1 1 37

BH_WEST 1 373,859 0 3 0 9 25 0 0 37BH_WEST 2 1,201,998 0 4 0 5 28 0 0 37BH_WEST 3 3,633,600 0 7 0 3 27 0 0 37

BH Total 98 479 67 166 122 2 3 937


26

Round 2 – BUSLO New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBL_COAST 1 36,803 47 0 5 7 0 0 0 59BL_COAST 2 76,708 64 0 4 4 0 0 0 72BL_COAST 3 162,154 67 0 4 4 0 0 0 75BL_COAST 4 438,285 60 0 4 4 0 0 0 68BL_COAST 5 2,644,911 67 0 3 3 0 0 0 73BL_EAST 1 47,306 0 11 0 0 0 0 0 11BL_EAST 2 133,097 0 12 0 0 0 0 0 12BL_EAST 3 2,531,289 0 24 1 0 0 0 0 25BL_FWEST 1 50,968 0 12 0 0 2 0 0 14BL_FWEST 2 151,471 0 12 3 0 2 0 0 17BL_FWEST 3 1,992,002 0 14 4 0 4 0 0 22BL_FWEST 4 Primary 0 26 7 0 2 0 0 35BL_NCENT 1 35,027 0 32 5 0 0 0 0 37BL_NCENT 2 67,610 0 59 1 0 1 0 0 61BL_NCENT 3 130,177 0 64 3 0 1 0 0 68BL_NCENT 4 320,175 0 58 3 0 1 0 0 62BL_NCENT 5 2,874,742 0 59 4 0 1 0 0 64BL_NORTH 1 44,864 0 3 3 0 4 0 0 10BL_NORTH 2 129,249 0 13 2 0 4 0 0 19BL_NORTH 3 2,199,476 0 14 2 0 5 0 0 21BL_SCENT 1 48,528 0 7 0 3 0 0 0 10BL_SCENT 2 145,787 0 17 0 5 0 0 0 22BL_SCENT 3 1,866,350 0 14 0 4 0 0 0 18BL_SOUTH 1 26,807 0 0 0 19 0 1 1 21BL_SOUTH 2 63,440 0 0 0 37 0 1 1 39BL_SOUTH 3 195,493 0 0 0 25 0 1 1 27BL_SOUTH 4 1,976,494 0 0 0 31 0 1 1 33BL_WEST 1 46,819 0 0 0 8 10 0 0 17BL_WEST 2 141,207 0 2 0 2 15 0 0 19BL_WEST 3 1,392,143 0 2 0 6 15 0 0 23BL Total 305 455 58 162 67 4 4 1054


27

Round 2 – BUSMED New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBM_COAST 1 110,168 51 0 5 3 0 0 0 59BM_COAST 2 225,150 52 0 3 3 0 0 0 58BM_COAST 3 465,486 49 0 4 3 0 0 0 56BM_COAST 4 991,928 47 0 3 1 0 0 0 51BM_COAST 5 6,067,086 54 0 2 2 0 0 0 58BM_EAST 1 160,718 0 21 1 0 0 0 0 22BM_EAST 2 473,416 0 23 1 0 0 0 0 24BM_EAST 3 3,068,772 0 28 1 0 0 0 0 29BM_FWEST 1 133,915 0 17 6 0 9 0 0 32BM_FWEST 2 416,064 0 21 2 0 4 0 0 27BM_FWEST 3 2,961,999 0 22 2 0 1 0 0 25BM_FWEST 4 Primary 0 34 5 0 0 0 0 39BM_NCENT 1 123,899 0 53 4 0 2 0 0 59BM_NCENT 2 268,172 0 69 3 0 1 0 0 73BM_NCENT 3 527,803 0 66 1 0 0 0 0 67BM_NCENT 4 1,066,964 0 62 3 0 1 0 0 66BM_NCENT 5 5,726,810 0 59 3 0 0 0 0 62BM_NORTH 1 162,431 0 13 3 0 14 0 0 30BM_NORTH 2 516,298 0 21 2 0 2 0 0 25BM_NORTH 3 3,319,034 0 30 1 0 0 0 0 31BM_SCENT 1 163,545 0 10 0 7 0 0 0 17BM_SCENT 2 515,097 0 9 0 0 0 0 0 9BM_SCENT 3 2,769,928 0 14 0 0 0 0 0 13BM_SOUTH 1 143,302 0 0 0 31 0 1 1 33BM_SOUTH 2 423,020 0 0 0 30 0 1 1 32BM_SOUTH 3 5,838,657 0 0 0 31 0 1 1 33BM_WEST 1 136,764 0 2 0 5 30 0 0 37BM_WEST 2 447,213 0 3 0 6 17 0 0 26BM_WEST 3 2,857,794 0 1 0 6 20 0 0 27BM Total 253 578 55 128 101 3 3 1120


28

Round 2 – BUSNODEM New Sample Points

Profile Stratum Boundary CNP TXU_ED TNMP AEPC AEPN SHRY NUE TotalBN_COAST 1 7,370 8 0 0 2 0 0 0 10BN_COAST 2 17,021 12 0 0 1 0 0 0 13BN_COAST 3 11,852,233 11 0 0 1 0 0 0 12BN_EAST 1 6,610 0 0 1 0 0 0 0 1BN_EAST 2 15,338 0 15 1 0 0 0 0 16BN_EAST 3 525,911 0 19 1 0 0 0 0 20BN_FWEST 1 6,182 0 0 0 0 6 0 0 6BN_FWEST 2 14,783 0 9 2 0 5 0 0 16BN_FWEST 3 6,330,786 0 10 1 0 3 0 0 14BN_NCENT 1 7,360 0 0 0 0 1 0 0 1BN_NCENT 2 16,226 0 0 1 0 1 0 0 2BN_NCENT 3 2,115,365 0 0 1 0 1 0 0 2BN_NORTH 1 5,812 0 0 0 0 3 0 0 3BN_NORTH 2 13,564 0 15 1 0 4 0 0 20BN_NORTH 3 800,482 0 9 2 0 1 0 0 12BN_SCENT 1 7,242 0 6 0 5 0 0 0 11BN_SCENT 2 15,424 0 16 0 2 0 0 0 18BN_SCENT 3 234,066 0 19 0 1 0 0 0 20BN_SOUTH 1 3,917 0 0 0 28 0 1 2 31BN_SOUTH 2 8,053 0 0 0 34 0 1 3 38BN_SOUTH 3 142,741 0 0 0 30 0 1 8 39BN_WEST 1 4,191 0 0 0 2 21 0 0 23BN_WEST 2 8,375 0 6 0 3 27 0 0 36BN_WEST 3 2,707,142 0 10 0 2 23 0 0 35BN Total 31 134 11 111 96 3 13 399


29

Round 2 – TDSP Summary

Required Retained New Required Retained New RESHI 521 35 486 RESHI 1060 361 699RESLO 577 43 534 RESLO 1060 347 713BUSHI 115 17 98 BUSHI 570 91 479BUSMED 286 33 253 BUSMED 871 293 578BUSLO 373 68 305 BUSLO 852 398 455BUSNODEM 121 90 31 BUSNODEM 601 828 134

1993 286 1707 5014 2318 3058


1426 303 1124 780 232 548

TXU_ED

AEPNAEPC

CenterPoint

30

Round 2 – TDSP Summary


405 75 334 20 0 20


40 0 40 9678 3214 6831

Nueces ALL TDSPS

SharylandTNMP

31

Next Steps

• PWG will discuss installation timelines for the new IDR installs and other issues related to Round 2

• PWG will work on LPG Section 15 to reflect PUCT Rule and procedures being adopted to conduct load research in the ERCOT market

1 ercot lrs detail sample design pwg presentation april 24, 2007

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