National Grid Local System Plan 2009 LSP Presentation Related Questions and Answers

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.

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.

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.

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 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.