10 Krey Boulevard     Rensselaer, NY  12144

July 31, 2012

Via Electronic Delivery

Honorable Kimberly D. Bose, Secretary Federal Energy Regulatory Commission 888 First Street, NE

Washington, DC 20426

Re: New York Independent System Operator, Inc., Docket No. ER06-1014-000
Twelfth Price Validation Informational Report

Dear Ms. Bose:

Pursuant to Ordering Paragraph (B) of the Commission’s July 14, 2006, order (“July 14 Order”) in the above-captioned proceeding,1 the New York Independent System Operator, Inc. (“NYISO”) respectfully submits this Price Validation Informational Report (“Report”), which details the corrections that the NYISO has made to erroneous Locational Based Marginal Prices (“LBMPs”)2 from the period January 1, 2012, through June 30, 2012, as well as actions the NYISO has taken to minimize pricing errors.

Due to the NYISO’s continued efforts, conducted in collaboration with its stakeholders, price errors and the need for price corrections continue to be infrequent.  In 2005, the NYISO corrected prices in approximately 16% of hours.  In 2006, that number was reduced to
approximately 3% of hours.  In 2007, the number was further reduced to approximately 1% of hours.  In 2008, the percentage of hours containing price errors continued to decline to
approximately 0.7%.  In 2009 the percentage of hours corrected was 0.3%.  In 2010 the
percentage of hours corrected was 0.2%.  In 2011 the correction rate showed a slight increase, with the percentage of hours corrected moving up to 0.3%.  This increase in price corrections
was due to issues related to the deployment of Enhanced Interregional Transaction Coordination (EITC) code, which introduced 15-minute scheduling of external transactions.3  In the first-half of 2012 the percentage of hours corrected dropped back to 0.2%.

1 New York Independent System Operator, Inc., 116 FERC ¶ 61,037 (2006).

2 Capitalized terms not otherwise defined herein shall have the meaning specified in Section 1 of the

NYISO’s Open Access Transmission Tariff (“OATT”) and Section 2 of the NYISO’s Market Administration and Control Area Services Tariff (“Services Tariff”).

3 See New York Independent System Operator, Order Conditionally Accepting Proposed Tariff Revisions
and Granting Waiver, Docket No. ER11-2547-000, 134 FERC 61,186 (issued March 14, 2011);  New York
Independent System Operator, Order Granting Deferral of Effective Dates and Waivers, Docket Nos. ER11-2454-
000 and ER11-2547-000, 135 FERC 61,256 (issued June 20, 2011); New York Independent System Operator, Inc.,

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 2

This dramatic reduction in price corrections indicates that the NYISO has substantially fulfilled the purpose behind the Commission-ordered price correction reports4 and, as a result, the NYISO will soon file with the Commission a Motion to cease making them.  Pursuant to its Services Tariff, the NYISO will continue to issue occurrence-driven and quarterly price
correction reports, which are posted on the NYISO website.  Since these provide substantially identical information to the information the NYISO regularly includes in the Commission-
ordered informational reports, the NYISO believes its price correction process will remain
transparent, even if these informational reports cease.5

I.Background

In its July 14 Order, the Commission conditionally accepted proposed revisions to the
NYISO’s tariffs to eliminate its temporary extraordinary procedures (“TEPs”) and establish a
framework and time limits for price corrections outside of the TEPs.  In that order, the
Commission required the NYISO to submit informational reports every six months thereafter
which indicate the causes of pricing errors that occurred during the reporting period, the duration
and rate impact of those errors and the associated corrections, and the actions the NYISO took to
correct the pricing errors.  In addition, the Commission directed the NYISO to summarize and
discuss what actions it undertook to reduce or eliminate the types of pricing errors that occurred.

This is the twelfth Report submitted in compliance with the July 14 Order.6  This Report details all of the price corrections the NYISO made for the period January 1, 2012, through
June 30, 2012, in its Real-Time Market.7  There were no Day-Ahead Market price corrections
during the reporting period.  The Report identifies the causes of each pricing error, the number of Real-Time Dispatch (“RTD”) intervals affected,8 and the amount by which each corrected price was changed.  In addition, the Report describes the measures taken by the NYISO to minimize
the incidence of pricing errors and to improve its price validation and correction practices.
Attachments A and B to this Report detail the Real-Time Market price corrections for the period January 1, 2012, through June 30, 2012.

Letter Order (accepting April 13, 2011, compliance filing on scheduling at proxy buses), Docket No. ER11-2547-
001 (issued July 21, 2011).

4 New York Independent System Operator, Inc., 116 FERC ¶ 61,037 (2006) ¶ 43.

5 Market Administration and Control Area Services Tariff §20.4.

6 The NYISO submitted the eleven prior reports to the Commission on January 31, 2007, July 31, 2007, January 31, 2008, August 1, 2008, January 30, 2009, July 31, 2009, January 31, 2010, July 29, 2010,
January 28, 2011, July 29, 2011, and January 31, 2012, respectively.

7 The Real-Time Market is defined as the “ISO-administered markets for Energy and Ancillary Services,

resulting from the operation of the RTC [Real-Time Commitment] and RTD [Real-Time Dispatch]” models.  OATT at Section 1.18; Services Tariff at Section 2.18.  While the NYISO corrects prices in the hour-ahead market, as
necessary, that “market” consists of only advisory prices that are not used in NYISO settlements.  Furthermore, the NYISO has corrected relatively few advisory prices during the period covered by this Report.

8 RTD intervals normally occur every five minutes.

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 3

II.Communications and Correspondence

Communications regarding this filing should be directed to:

Robert E. Fernandez, General Counsel

*Mollie Lampi, Assistant General Counsel

Raymond Stalter, Director of Regulatory Affairs
New York Independent System Operator, Inc.

10 Krey Boulevard

Rensselaer, NY 12144
Tel:  (518) 356-6000
Fax:  (518) 356-4702
rfernandez@nyiso.com
mlampi@nyiso.com
rstalter@nyiso.com

*Person designated to receive service.

III.Service

The NYISO will send an electronic link to this filing to the official service list compiled
by the Secretary in this proceeding, to the official representative of each of its customers, to the
New York Public Service Commission, and to the New Jersey Board of Public Utilities.  In
addition, a complete copy of this filing will be posted on the NYISO’s website at
www.nyiso.com.

IV.Report Details

A.Types and Causes of Pricing Errors

Attachment Q of the OATT and Attachment E of the Services Tariff define two types of price errors.9  The first type of error (“Type I - Calculation Error”) results from a simple
miscalculation and can reflect a software programming error or a failure of the software to
produce an accurate price calculation.  The second type of error (“Type II - Incorrect Marginal Resource”) results when a price is based on an incorrect price-setting resource.

The NYISO classifies pricing errors at two levels.  The first level is the type of error, as described above.  The second level provides a more detailed description of the underlying cause of the error.  The NYISO recognizes eight second-level error classifications, as follows:

9 See OATT, Attachment Q at Sections 23.1.1 and 23.1.2; Services Tariff, Attachment E at Sections 20.1.1 and 20.1.2.

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 4

1 -  Posting Error - Posting errors occur when prices do not properly post on NYISO’s
website.  These include instances when prices posted incorrectly or did not post at
all.

2 -  Indeterminacy / Penalty or Shift Factor Trade-offs - Indeterminacies occur when
the pricing solution cannot be tied to a specific resource.  Penalty and shift factor
trade-offs are dispatch schedules that are mathematically correct but inconsistent
with actual operating practices or procedures.

3 -  Static Data Error - Static data errors are instances when incorrect non-metered data
are used in the pricing and scheduling system software.

4 -  Computer System Failure - Computer system failures include all IT hardware
systems used in compiling data, and calculating and posting prices.

5 -  Software Error - Software errors are programming errors in the computer code that
is used in the commitment, dispatch and price calculation processes.

6 -  Telemetry - Telemetry issues are caused by problems in the metering, compilation
and conveyance of meter data from generators, loads, tie lines and phase angle
regulators to the NYISO.

7 -  Prices Inconsistent with Dispatch / No Marginal Unit - Errors here are the result
of the unit dispatch and pricing not being consistent.  Also included are instances
when no marginal unit can be identified.

8 -  Operator Input - Operator input errors occur when the system operator enters an
erroneous value that results in incorrect pricing.

B. Discussion of Pricing Errors from January through June 2012

The NYISO has conducted an analysis of its Real-Time Market from January through

June 2012 to determine the number of intervals and hours that required price corrections, as well as the causes of the underlying price errors.  Table 1-A below provides a count of hours
corrected by month in the Real-Time Market.

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 5

Table 1-A

RTD Hours Corrected
January - June 2012

2012

January
February

March
April

May
June

Hours

CorrectedTotal% Corrected

07440.00%

06960.00%

07440.00%

27200.28%

87441.08%
0 720 0.00%

Total104,3680.23%

As shown above, the NYISO corrected prices in only 0.23% of the hours in the first half of 2012.  It should be noted that any hour that had at least one interval corrected is included in this tabulation.  During this period, four months, January, February, March and June, had no price corrections.  April had two hours corrected, and May had price corrections in eight hours. Nearly all of the hours with price corrections in May were due to load forecaster issues,
primarily from data feeds and inputs used by the load forecaster model.

Table 1-B below provides a compilation, by month, of the number of RTD intervals
corrected from January through June of 2012.  The percentage of intervals corrected is
significantly less than the percentage of hours corrected because not all intervals in a corrected hour were erroneous.

Table 1-B

RTD Intervals Corrected
January - June 2012

2012

January
February

March
April

May
June

Intervals

CorrectedTotal% Corrected

09,0250.00%

08,3990.00%

08,9770.00%

58,7160.06%

409,0190.44%
0 8,786 0.00%

Total4552,9220.09%

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 6

For the period January through June 2012 there were 45 RTD intervals corrected for a

correction rate of 0.09%.  The highest monthly interval correction rate of 0.44% occurred in May due to the load forecaster issue identified above.  All but four intervals corrected in May were because of this problem.

The price corrections from January through June 2012 were classified by error type and error description for both hours and intervals.  Table 2 provides the distribution of price
corrections by month between the error types (Type I - Calculation Error or Type II - Incorrect Marginal Resource).

As Table 2 shows, all of the RTD interval price corrections in the first half of 2012 were due to Type II errors.

Table 2

RTD Price Correction Error Types
January - June 2012

2012

January
February

March
April

May
June

Intervals

Type IType II

--

--

--

-5

-40

--

Hours

Type IType II

--

--

--

-2

-8

--

Total045010

Table 3 presents a summary of RTD interval price corrections classified by reason for the second half of 2012.

Table 3

January - June 2012

RTD Interval Price Corrections by Reason

ReasonJanFebMarAprMayJunTotal

1- PostingError------0

2- Indeterminacy / Penalty orShift FactorTrade-Off------0

3- DataError-Static------0

4- ComputerSystemFailure------0

5 - Software Error---527-32

6- Telemetry------0

7- Prices Inconsistent w/Dispatch/ NoMarginalUnit------0

8- OperatorInput----13-13

Total000540045

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 7

January Price Corrections

There were no price corrections in January 2012.

February Price Corrections

There were no price corrections in February 2012.

March Price Corrections

There were no price corrections in March 2012.

April Price Corrections

There were five intervals corrected in April spanning a total of 2 hours.  Three intervals were corrected on April 17.  The erroneous prices were the result of an incorrect data feed to the load forecaster.  The remaining two intervals from April 23 were also corrected due to a load forecaster error, this time caused by an incorrect initialization.

May Price Corrections

May 2012 had the largest number of price corrections: 40 intervals over three days

spanning 8 hours.  May 1 had price corrections in 26 intervals covering 6 hours.  These errors
were manifested by unstable behavior of the load forecaster model caused by incorrect load
forecaster model coefficients.  On May 11 there was one interval corrected when a posting
problem resulted in a missing interval.  The final RTD energy price correction occurred on May

21 and was due to an operator error resulting in an incorrect interface limit that erroneously triggered special pricing rules.

June Price Corrections

There were no price corrections in June.

C.Correction of Pricing Errors

When erroneous prices are found, there are a number of ways they can be corrected.  The Services Tariff allows for the following seven correction modes for erroneous LBMPs:

1. Replace with the price of a preceding or subsequent interval;

2. Average the preceding and subsequent interval prices;

3. Replace with the advisory price of a preceding interval;

4. Substitute erroneous LBMP with price from a similar bus;

5. Recalculate prices;

6. Replace with prices of another market (RTC or SCUC); and

7. Repost missing prices.

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 8

In accordance with NYISO Services Tariff, price corrections must accurately reflect

actual system conditions.  A correction mode that is appropriate for an error in one circumstance
may not be appropriate for the same error in another circumstance due, for example, to different
commitment schedules, constraint patterns or external schedules.  When pricing errors are found,
the NYISO conducts an evaluation of the system conditions in the erroneous pricing interval, and
uses a correction mode that most accurately reflects those conditions.  The determining factor is
how closely the final price reflects the state of the system during the erroneous pricing interval.

D.Impact of Price Corrections

The impact of price corrections on zonal LBMPs was evaluated for the period January
through June 2012.  In this evaluation, the average change in LBMP was calculated for each
month using zonal prices in the Real-Time Market.  The number of price increases and decreases
that resulted from the price corrections was also examined.  Tables 4 and 5 present the results of
this analysis.

Table 4

Average Zonal Price Change
January - June 2012

JanFebMarAprMayJun

CAPITAL----538.39126.97-

CENTRAL----514.92121.11-

DUNWOODIE----535.82128.54-

GENESEE----504.44117.67-

HUDSON VALLEY----539.36128.35-

LONG ISLAND----536.78-18.56-

MILLWOOD----536.84128.37-

MOHAWK VALLEY----525.35122.77-

NEW YORK CITY----516.21129.07-

NORTH----422.95114.71-

WEST----486.83114.08-

HQ----426.48113.66-

NPX----531.34124.27-

OH----477.77109.34-

PJM----504.38-311.93-

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 9

Table 5

Zonal Price Change Count (Increase/Decrease)
January - June 2012

JanFebMarAprMayJunTotal

Increase  DecreaseIncrease  DecreaseIncrease  DecreaseIncrease  DecreaseIncrease  DecreaseIncrease  DecreaseIncrease  Decrease

CAPITAL------23251--274

CENTRAL------23251--274

DUNWOODIE------23251--274

GENESEE------23251--274

HUDSON VALLEY------23251--274

LONG ISLAND------231610--1813

MILLWOOD------23251--274

MOHAWK VALLEY------23251--274

NEW YORK CITY------23251--274

NORTH------41251--292

WEST------23251--274

HQ------41191--232

NPX------23231--254

OH------23231--254

PJM------232413--2616

Total0000003441355360038977

As can be seen in Table 4, the average zonal price changes were significantly negative in April and, with the exception of two zones, positive in May.  The April average change across all zones was -$500.  The average change across all zones in May was over $83.  As shown in Table 5, there were a total of 466 zonal interval prices corrected.  Of these, 389 zonal interval prices (83%) were increased and 77 (17%) were decreased.

E.Price Correction Mitigation Initiatives

The NYISO’s efforts to improve initial price accuracy have successfully maintained a

high level of price accuracy in 2012.  This continued success is due to the NYISO’s commitment to identifying pricing problems, thoroughly evaluating the problems, and developing, where
possible, solutions to mitigate the problems.  These efforts have dramatically reduced pricing
errors since 2006.

For the January through June 2012 reporting period the NYISO has initiated a number of efforts - both institutional (e.g., software enhancements) and operational - to revise and develop strategies and procedures to mitigate pricing errors.  Among the measures undertaken during the reporting period are:

•   The Intelligent Source Selection (ISS), an automated system that screens telemetry

and switches to alternate metering sources when erroneous values are found, has been enhanced to expand and improve monitoring of generators, lines and PARs.

•   On-going operator training has an enhanced curriculum to focus on the identification
and response to pricing problems.

•   The NYISO has continued to enhance its network model and scheduling systems to
improve performance.

Honorable Kimberly D. Bose, Secretary July 31, 2012

Page 10

•   Corrections to the Scarcity Pricing posting logic.

V.Conclusion

WHEREFORE, the New York Independent System Operator, Inc., respectfully requests that the Commission accept this informational report.

Respectfully submitted,

/s/ Mollie Lampi

Mollie Lampi

Assistant General Counsel

New York Independent System Operator, Inc.

10 Krey Blvd.

Rensselaer, NY 12144 (518) 356-7530

mlampi@nyiso.com

ATTACHMENT A

RTD Price Correction Report
January - June 2012

RTD Energy Price Correction Report

1Posting Error

2Indeterminacy / Penalty or Shift Factor Trade-offs

3Data Error - Static

4Computer System Failure

5Software Error

6Telemetry

7Prices Inconsistent w/Dispatch / No Marginal Unit

8Operator Input

Error Type:

ICalculation Error
II Incorrect Price Setting Resource

aReplace w/Preceding Interval

bReplace w/Subsequent Interval

cAverage - Preceding & Subsequent

dReplace w/RTD Advisory Price

eSubstitution w/Similar Bus Price

fRTD Re-Run

gReplace w/RTC Prices

hReplace w/SCUC Prices

iRecalculation - External Proxy

jRecalculation
k Re-Post

Intervals Corrected by Zone

Additional Comments

4/17/20129:30:009:40:0039II5d333333333333333Software Error

4/23/20128:01:478:03:1128II5d222222222222222Software Error

Apr 201252555555555555555

5/1/20121:25:001:30:0021II5d222222222222222Software Error

5/1/20121:45:001:45:0011II5d111111111111111Software Error

5/1/20121:49:471:49:4711II5d111111111111111Software Error

5/1/20122:20:002:25:0022II5d222222222222222Software Error

5/1/20124:40:004:45:0024II5d222222222222000Software Error

5/1/20126:25:006:30:0026II5d222222222222222Software Error

5/1/20126:32:596:32:5916II5d111111111110111Software Error

5/1/20126:52:476:52:4716II5a111111111110111Software Error

5/1/20127:00:007:00:0016II5c111111111110111Software Error

5/1/20127:00:417:55:00127II5c121212121212121212121210121212Software Error

5/1/20129:15:009:15:0019II5d111111111110111Software Error

5/11/20124:00:004:00:0013II5k111111111111111Software Error

5/21/201214:05:0015:00:001314II8k0000000000000013Operator Error

May 2012408272727272727272727272721252538

7/4/201206:55:0006:55:0016II5d111111111111111Software Error

Jul 201211111111111111111

ATTACHMENT B

RTD Price Correction Impact
January - June 2012

Note to Attachment B:

The tally of intervals corrected in the body of this report provided in

Tables 1-B, 2 and 3 are for all energy price corrections.  The tables in Attachment
B do not include the May 11, 2012 price correction, which did not have any prices
posted for the 04:00 interval.  The price correction posted these missing prices.

CAPITAL

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0019.6720.02

04/17/201209:35:0020.1620.00

04/17/201209:40:0020.2020.00

04/23/201208:01:472,753.5830.82

04/23/201208:03:110.0230.82

05/01/201201:25:000.0017.74

05/01/201201:30:000.0117.74

05/01/201201:45:0054.2025.55

05/01/201201:49:47-10.2424.52

05/01/201202:20:00-90.6925.37

05/01/201202:25:000.0125.37

05/01/201204:40:00-179.5717.54

05/01/201204:45:00-106.7717.54

05/01/201206:25:00-214.6022.22

05/01/201206:30:000.0122.22

05/01/201206:32:590.0125.03

05/01/201206:52:47-212.0817.43

05/01/201207:00:00-426.6318.71

05/01/201207:00:41-426.6318.71

05/01/201207:08:11-438.2718.71

05/01/201207:11:23-441.1418.71

05/01/201207:15:00-57.8718.71

05/01/201207:20:00-57.8718.71

05/01/201207:25:00-113.6418.71

05/01/201207:30:000.0118.71

05/01/201207:35:000.0118.71

05/01/201207:40:000.0218.71

05/01/201207:45:000.0218.71

05/01/201207:50:00-56.3218.71

05/01/201207:55:000.0118.71

05/01/201209:15:000.0221.82

CENTRAL

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0019.1519.54

04/17/201209:35:0019.6219.52

04/17/201209:40:0019.6819.52

04/23/201208:01:472,633.0829.19

04/23/201208:03:110.0229.19

05/01/201201:25:000.0017.23

05/01/201201:30:000.0117.23

05/01/201201:45:0053.6324.91

05/01/201201:49:47-10.0123.98

05/01/201202:20:00-88.4524.70

05/01/201202:25:000.0124.70

05/01/201204:40:00-173.7916.98

05/01/201204:45:00-103.3416.98

05/01/201206:25:00-209.1321.53

05/01/201206:30:000.0121.53

05/01/201206:32:590.0124.20

05/01/201206:52:47-209.6717.30

05/01/201207:00:00-404.6217.99

05/01/201207:00:41-404.6217.99

05/01/201207:08:11-411.6517.99

05/01/201207:11:23-413.9617.99

05/01/201207:15:00-54.0617.99

05/01/201207:20:00-54.0617.99

05/01/201207:25:00-106.4517.99

05/01/201207:30:000.0117.99

05/01/201207:35:000.0117.99

05/01/201207:40:000.0217.99

05/01/201207:45:000.0217.99

05/01/201207:50:00-52.3417.99

05/01/201207:55:000.0117.99

05/01/201209:15:000.0221.29

DUNWOOD

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0020.2920.63

04/17/201209:35:0020.7720.58

04/17/201209:40:0020.8320.58

04/23/201208:01:472,740.7630.88

04/23/201208:03:110.0230.88

05/01/201201:25:000.0017.72

05/01/201201:30:000.0117.72

05/01/201201:45:0054.2025.55

05/01/201201:49:47-10.2224.52

05/01/201202:20:00-89.9125.32

05/01/201202:25:000.0125.32

05/01/201204:40:00-178.8917.52

05/01/201204:45:00-106.2717.52

05/01/201206:25:00-215.6222.43

05/01/201206:30:000.0122.43

05/01/201206:32:590.0125.27

05/01/201206:52:47-212.2917.53

05/01/201207:00:00-433.4418.93

05/01/201207:00:41-433.4418.93

05/01/201207:08:11-446.4618.93

05/01/201207:11:23-450.6218.93

05/01/201207:15:00-59.1118.93

05/01/201207:20:00-59.1118.93

05/01/201207:25:00-115.9618.93

05/01/201207:30:000.0118.93

05/01/201207:35:000.0118.93

05/01/201207:40:000.0218.93

05/01/201207:45:000.0218.93

05/01/201207:50:00-57.7918.93

05/01/201207:55:000.0118.93

05/01/201209:15:000.0222.21

GENESEE

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0018.5719.01

04/17/201209:35:0019.0518.99

04/17/201209:40:0019.0718.99

04/23/201208:01:472,579.2428.38

04/23/201208:03:110.0228.38

05/01/201201:25:000.0016.98

05/01/201201:30:000.0116.98

05/01/201201:45:0052.9624.58

05/01/201201:49:47-9.9023.70

05/01/201202:20:00-87.2524.24

05/01/201202:25:000.0124.24

05/01/201204:40:00-171.7416.78

05/01/201204:45:00-102.0216.78

05/01/201206:25:00-207.1021.17

05/01/201206:30:000.0121.17

05/01/201206:32:590.0123.78

05/01/201206:52:47-206.2417.10

05/01/201207:00:00-392.6117.63

05/01/201207:00:41-392.6117.63

05/01/201207:08:11-394.0317.63

05/01/201207:11:23-395.8317.63

05/01/201207:15:00-51.7417.63

05/01/201207:20:00-51.7417.63

05/01/201207:25:00-101.9017.63

05/01/201207:30:000.0117.63

05/01/201207:35:000.0117.63

05/01/201207:40:000.0217.63

05/01/201207:45:000.0217.63

05/01/201207:50:00-50.0917.63

05/01/201207:55:000.0117.63

05/01/201209:15:000.0221.04

HUDSON VALLEY

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0020.3120.64

04/17/201209:35:0020.7920.60

04/17/201209:40:0020.8520.60

04/23/201208:01:472,758.7131.02

04/23/201208:03:110.0231.02

05/01/201201:25:000.0017.80

05/01/201201:30:000.0117.80

05/01/201201:45:0054.5125.64

05/01/201201:49:47-10.2724.63

05/01/201202:20:00-90.2625.47

05/01/201202:25:000.0125.47

05/01/201204:40:00-179.7417.57

05/01/201204:45:00-106.7717.57

05/01/201206:25:00-216.8422.51

05/01/201206:30:000.0122.51

05/01/201206:32:590.0125.36

05/01/201206:52:47-213.2917.63

05/01/201207:00:00-432.2418.87

05/01/201207:00:41-432.2418.87

05/01/201207:08:11-444.4118.87

05/01/201207:11:23-448.1418.87

05/01/201207:15:00-58.7318.87

05/01/201207:20:00-58.7318.87

05/01/201207:25:00-115.3318.87

05/01/201207:30:000.0118.87

05/01/201207:35:000.0118.87

05/01/201207:40:000.0218.87

05/01/201207:45:000.0218.87

05/01/201207:50:00-57.4218.87

05/01/201207:55:000.0118.87

05/01/201209:15:000.0222.17

LONG ISLAND

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0020.3620.63

04/17/201209:35:0020.7820.60

04/17/201209:40:0020.9020.60

04/23/201208:01:472,745.8931.11

04/23/201208:03:110.0231.11

05/01/201201:25:000.0017.95

05/01/201201:30:000.0117.95

05/01/201201:45:0055.1425.91

05/01/201201:49:47-10.3224.84

05/01/201202:20:00-90.6025.61

05/01/201202:25:000.0125.61

05/01/201204:40:00-180.9417.77

05/01/201204:45:00-107.3817.77

05/01/201206:25:00-219.0723.21

05/01/201206:30:000.0123.21

05/01/201206:32:590.0125.69

05/01/201206:52:47-212.0817.55

05/01/201207:00:00-447.4431.60

05/01/201207:00:41-447.4431.60

05/01/201207:08:11-466.5231.60

05/01/201207:11:23378.5531.60

05/01/201207:15:00374.2731.60

05/01/201207:20:00374.2731.60

05/01/201207:25:00407.9331.60

05/01/201207:30:00354.2431.60

05/01/201207:35:00354.2431.60

05/01/201207:40:00354.2431.60

05/01/201207:45:00354.2431.60

05/01/201207:50:00353.3531.60

05/01/201207:55:000.0131.60

05/01/201209:15:000.0222.36

MILLWOOD

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0020.2920.63

04/17/201209:35:0020.7720.58

04/17/201209:40:0020.8320.58

04/23/201208:01:472,745.8930.91

04/23/201208:03:110.0230.91

05/01/201201:25:000.0017.74

05/01/201201:30:000.0117.74

05/01/201201:45:0054.2025.50

05/01/201201:49:47-10.2424.47

05/01/201202:20:00-90.0925.32

05/01/201202:25:000.0125.32

05/01/201204:40:00-179.4017.56

05/01/201204:45:00-106.4717.56

05/01/201206:25:00-215.4222.45

05/01/201206:30:000.0122.45

05/01/201206:32:590.0125.29

05/01/201206:52:47-212.2917.53

05/01/201207:00:00-432.6418.91

05/01/201207:00:41-432.6418.91

05/01/201207:08:11-445.2318.91

05/01/201207:11:23-449.3818.91

05/01/201207:15:00-58.9518.91

05/01/201207:20:00-58.9518.91

05/01/201207:25:00-115.6418.91

05/01/201207:30:000.0118.91

05/01/201207:35:000.0118.91

05/01/201207:40:000.0218.91

05/01/201207:45:000.0218.91

05/01/201207:50:00-57.6318.91

05/01/201207:55:000.0118.91

05/01/201209:15:000.0222.17

MOHAWK VALLEY

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0019.4719.87

04/17/201209:35:0019.9519.84

04/17/201209:40:0019.9919.84

04/23/201208:01:472,686.9230.02

04/23/201208:03:110.0230.02

05/01/201201:25:000.0017.10

05/01/201201:30:000.0117.10

05/01/201201:45:0052.9124.65

05/01/201201:49:47-9.8923.75

05/01/201202:20:00-88.5424.70

05/01/201202:25:000.0124.70

05/01/201204:40:00-172.7716.89

05/01/201204:45:00-102.7316.89

05/01/201206:25:00-207.5121.61

05/01/201206:30:000.0121.61

05/01/201206:32:590.0124.35

05/01/201206:52:47-208.0617.10

05/01/201207:00:00-412.6218.25

05/01/201207:00:41-412.6218.25

05/01/201207:08:11-421.8918.25

05/01/201207:11:23-425.0818.25

05/01/201207:15:00-55.4018.25

05/01/201207:20:00-55.4018.25

05/01/201207:25:00-109.2018.25

05/01/201207:30:000.0118.25

05/01/201207:35:000.0118.25

05/01/201207:40:000.0218.25

05/01/201207:45:000.0218.25

05/01/201207:50:00-54.0218.25

05/01/201207:55:000.0118.25

05/01/201209:15:000.0221.56

NEW YORK CITY

Time StampOriginal LBMPFinal LBMP

04/17/201209:30:0020.5520.78

04/17/201209:35:0020.9820.74

04/17/201209:40:0021.0420.74

04/23/201208:01:472,641.0930.18

04/23/201208:03:110.0230.18

05/01/201201:25:000.0017.74

05/01/201201:30:000.0117.74

05/01/201201:45:0054.0525.55

05/01/201201:49:47-10.2324.52

05/01/201202:20:00-89.9125.32

05/01/201202:25:000.0125.32

05/01/201204:40:00-178.8917.52

05/01/201204:45:00-106.1717.52

05/01/201206:25:00-215.8222.47

05/01/201206:30:000.0122.47

05/01/201206:32:590.0125.31

05/01/201206:52:47-212.6917.60

05/01/201207:00:00-435.0419.06

05/01/201207:00:41-435.0419.06

05/01/201207:08:11-448.5119.06