National GridLocal System Plan2009 LSP Presentation Related Questions and Answers

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2009 LSP Questions and Answers

Question:

Patricia Kelly from the Massachusetts Attorney General office

requested that asset owner (by company) of each project be

included in the LSP Project List.

Answer:

Attachment K requires the LSP Project List to be comparable to the

RSP Project List. The RSP Project List contains a column for

“Primary Equipment Owner”. We interpret this to be “National

Grid” for the RSP Project List. We do not see any issue with

listing the asset company owner of the facility associated with the

project in the LSP Project List. A column that indicates “Asset

Owner by company” will be added to future LSP Project Lists.

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2009 LSP Questions and Answers Continued

Question:

Patricia Kelly from the Massachusetts Attorney General office

requested that estimated cost of each project be included in the

LSP Project List similar to the RSP Project List.

Answer:

Attachment K requires the LSP Project List to be comparable to the

RSP Project List. The RSP Project List does include cost

estimates with accuracies that reflect the maturity of the project or

Project Stage. A column that lists the cost estimate with

accuracies and variances that reflect the Project Stage, similar to

the RSP Project List, will be added to future LSP Project Lists.

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2009 LSP Questions and Answers Continued

Question:

Bruce McKinnon of CMEEC asked if the planned load transfer,

associated with listed Union Loop study, from Chartley Pond

Substation to the Proposed Patriot Place Substation, will alleviate

the need to replace the Chartley Pond T1 transformer as shown in

the 2009 LSP Project List.

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2009 LSP Questions and Answers Continued

Answer: As part of the Foxboro area load addition, associated with Patriot Place, the proposed

Patriot Place Substation 40 MVA,115 – 13 kV transformer will accommodate the new

load and load transfers from South Wrentham Substation and Chartley Pond

Substation. The proposed load transfer from Chartley Pond Substation to the

proposed Patriot Place Substation in 2013 is approximately 1 MW.

Presently, Chartley Pond Substation has two 115-23 kV transformers. The T1

transformer has a summer emergency capability of 54.7 MVA and the T2

transformer has a summer emergency capability of 77 MVA. The 2009 summer

peak load on both T1 and T2 was approximately 69.3 MVA. As such, in 2010 it is

proposed that T1 be replaced with a larger transformer size to have similar summer

emergency capability as T2. Furthermore, the planned distribution load transfer in

2013 is associated with area distribution feeder load management, and does not

defer the need to replace transformer T1 with a larger sized transformer in 2010.