NH Conservation

C-129 115kV line

map showing line location

2023, December 2020-2023 Revision 1 PAC presentation

2022, June 3: request to ISO for pool supported cost treatment

2021, March 15: order granting crossing. "The Company proposes to replace four existing wood structures with newly constructed steel support structures to ensure continued safe and reliable operation. Two existing shield wires will be replaced with two optical ground The scope of this project is located to the south of Flagg Road and east of Stillwater Circle in Rochester beginning at Structure 208 then traversing northeast to Structures 209, 210, and 211 thereby creating two public water crossings...the OPGWs and three existing conductors will be transferred to the new structures

2021, January 19 & 21: PAC presentation; "Nearly all structures cannot support new conductor and/or OPGW"

2020, November 30: staff recommendation; "All (3) existing ACSR 795 kcmil [36/1] conductors for the C129 line will be transferred to the new structures with replacement of the (2) existing shield wires with (2) 48 fiber optical ground wire (OPGW)"

2020, November 25: revised exhibit for Isinglass River crossings

2020, November 9: crossing petition; " replace four original wood structures (208, 209, 210 & 211) at the two crossing spans... with steel structures...replacement of the two existing shield wires with two OPGW communications wires"

2020, November 9: crossing petition exhibits, clearance 23.9' and 20.7'

2011, April 5: petition for crossings; “As presently existing, an 8.51 mile length of the C-129 line between Deerfield and Rochester Substations (from structure 3 to structure 113) is constructed with 477 18/1 ACSR conductor. The other portions of this line, from Deerfield Substation to structure 3, and from structure 113 to Rochester Substation, are constructed of 795 ACSR 36/1 conductor. The replacement aspect of this project will remove all of the existing 477 ACSR 18/1 (conductor) and 3#6 Alumoweld (static wire) and install new 795 ACSR 26/7 (conductor) and 9#10 Alumoweld (static wire) for the 8.51 mile length of the line between structures 3 and 113. Replacing this conductor will remove an overload condition that will occur when the new transformer at Deerfield Substation is placed in service. On the other portions of the C-129 line with existing 795 ACSR 36/1 conductor, the conductor and static wires will remain but will be up-rated for operation.”

2011, April 5: crossing exhibits with structure diagrams. Bean, North and Oyster River crossings have 795 ASCR 26/7 and 19#10 Alumoweld and the easement includes the L-175 307 345kV lines. Bellamy and Isinglass crossing are 795 ASCR 36/1, 7#8 Alumoweld and the easement includes the L-175

2011, July 22: staff recommendation for Bean River, North River and Little River, in Nottingham. "The Commission has not previously licensed these existing overhead crossings...The upgrade is necessitated by load growth in the seacoast area of New Hampshire and the installation of an additional autotransformer at Deerfield Substation in Deerfield, New Hampshire...staff concludes that this [Little] river crossing does not meet the intent of the statute with respect to the licensing requirements of crossings over public waters, and that approval of the proposed upgrades is consistent with the public interest. Based on the same review of the petition and existing field conditions, Staff has determined that the Bean River and North River crossings meet the intent of the statute and require licensing."

2011, July 22: staff recommendation for two crossing of Isinglass River in Rochester. "The Commission did not previously license these existing overhead crossings...Even though PSNH will not be replacing conductors over the Isinglass River crossings, PSNH is petitioning to license these locations (structures 208-209, and structures 210 211) because of the up-rate and resulting different sag clearances."

2011, July 22: staff recommendation for Oyster River and Bellamy River in Barrington. "The Commission has not previously licensed these two existing overhead crossings...The reconductoring of the C-129 line will require upgrading of one location (structures 104-105) on the Oyster River in the Town of Barrington...PSNH will not be replacing conductors over the Bellamy River

2011, August 11: Order Nisi granting crossing

wetland at ne corner, about to be destroyed

wetland at ne corner prior to destruction

wetland at ne corner

wetland post-fill