Settlement and Extracts GroupJune 20, 2011

Base Point Deviation – NPRR377ERCOT Settlement & Billing Group

Base Point Deviation – NPRR377 GREDP Inputs

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Base Point Deviation – NPRR377 GREDP Inputs

5-Min Clock

IntervalAvg MW

Avg Base Point

Avg Reg Instruction

14:00:00 179.013 177.825 0

14:05:00 174.106 176.326 0

14:10:00 187.9733 188.489 0

Total 541.09 542.64 0.00

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Under Generation 95% 5MW Minimum UGEN5M

5MIN - 1 168.9345 172.825778 -10.07884444 0

5MIN - 2 167.5103 171.326649 -6.596350223 0

5MIN - 3 179.0654 183.489936 -8.907893872 0

Over Generation 1.05% 5MW Minimum OGEN5M

5MIN - 1 186.7171 182.825778 -7.703733333 0

5MIN - 2 185.143 181.326649 -11.03631467 0

5MIN - 3 197.9144 193.489936 -9.941099755 0

Base Point Deviation – NPRR377 GREDP Inputs

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Base Point Deviation – NPRR377 GREDP Inputs

Once the over and under volume for each 5 minutes is calculated, then apply the price for the 15 minute settlement interval.

Over Generation:BPDAMT q, r, p, i = Max (PR1, RTSPP p, i) * (OGEN q, r, p, i *1/12)

OGEN q, r, p, i = (OGEN5M q, r, p, i, y)

Under Generation:BPDAMT q, r, p, i = -1 * Min (PR2, RTSPPp,i) * Min (1, KP) * (UGEN q, r, p, i * 1/12)

UGEN q, r, p ,i = (UGEN5M q, r, p, i, y)

y

5

y

Base Point Deviation – NPRR377 changes for IRR

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 [ab1]Some of the cons seemed the same, maybe my notes weren’t good

Base Point Charges for IRR are upgraded to calculate on a 5 minute clock interval basis

Please note:

• Charges will be assessed for each 5 minute clock interval where the resource received a flag signifying a Base Point below HDL for all SCED intervals within the five-minute clock interval

• KIRR is changed to 5%