LIHI Certificate #92 - Pierce Mills Project, Vermont

Pierce Mills Project - LIHI Certificate #92
项目名称 Pierce Mills
LIHI 证书编号 92
LIHI 证书期限 February 6, 2017 – February 5, 2030
所有者 Green Mountain Power Corporation
状态 佛蒙特
地点 Located at river mile 15.2 on the Passumpsic River, a tributary of the Connecticut River; the most upstream of the Passumpsic River Projects.
装机容量 250 kW
平均年发电量 1,133 MWh
设施类型 径流式
联邦能源管理委员会 不。 P-2396 issued in 1994, expires 11/30/2034

The Pierce Mills Project is located in northeastern Vermont near St. Johnsbury, in Caledonia County, on the Passumpsic River. It was built in 1917-1919 by the Twin State Gas & Electric Company. The 发电站 was completely destroyed in the flood of 1927, although the concrete 坝 was largely undamaged. The plant was rebuilt in 1928 utilizing portions of the earlier substructure.

The Passumpsic River is host to several dams of which the project is the fifth on the river.  Downstream are Arnold Falls (LIHI #93), Gage (LIHI #94), Passumpsic Project (LIHI #95) and East Barnet (FERC No. 3051), the first dam on the river. The river is 22.7 miles long and a tributary to the Connecticut River, entering just downstream of Comerford 坝 (part of the Fifteen Mile Falls Project, LIHI #39). The project is owned by Green Mountain Power (GMP), the first energy utility certified as a B-Corporation.

The project includes: a dam, 闪光板, intake structure, powerhouse, one vertical turbine, 变电站, 泄洪道, and bypassed reach.

The concrete 重力坝 is 93-feet-long by18-feet-high, topped with 18-inch flashboards. A 37-foot-long intake structure forms the left 邻接, with a manually operated bulkhead gate and trashrack. A 6-foot diameter, 246-foot-long wood stave 压力水管 conveys flows from the dam to the powerhouse. The powerhouse contains one vertical shaft turbine and generator with an installed capacity of 0.25 MW, along with appurtenant equipment.

该项目采用 径流 mode and impounds a 24.7-acre reservoir. The project provides a minimum flow of 20 cfs from April 1 through June 15 and from September 15 through November 15. Additionally, downstream 鱼道 is facilitated by an 88 cfs or inflow, whichever is less, passage flow. An aesthetic flow of 7 cfs is spilled over the flashboards from June 1 through October 31. These flow prescriptions were developed in consultation with the Vermont Agency of Natural Resources (VANR) and United States Fish and Wildlife Service.

Waters within the project reach are designated Class B and impaired for E. coli contamination due to the St. Johnsbury wastewater treatment plant passing combined sewer overflows. VANR has confirmed that the project does not adversely impact water quality and is not the source of river impairments. Class B waters are managed to support aquatic biota, wildlife, and aquatic habitat, public water supply, irrigation, primary contact recreation, and aesthetics.

While the Connecticut 流域 historically hosted naturally occurring Atlantic salmon runs, the species was 拔除 from the river system due to the construction of dams. These downstream dams create a barrier to upstream passage at the project. Downstream passage is facilitated year-round via a transition box located in the spillway with an 88 cfs passage flow which leads to a 瀑布水潭. Trashracks with 1-inch spacing mitigate the potential for 夹带.

The project lands consist of 2.8 acres. The lands surrounding the project are primarily mixed industrial and commercial buildings, rural residential housing, and farmland, with no lands of significant ecological value in the project area.

Threatened or endangered species potentially present in the project vicinity include the Northern Long-eared Bat, Spikemoss, and Shining Lady’s Tresses. Significant habitat does exist in the project vicinity but consultation with VANR determined that these habitats would not be adversely impacted by project operations.

Cultural resources in the project area include the project infrastructure which is eligible for listing on the 国家历史遗迹名录. The project owner submits annual reports to the Vermont Division for Historic Preservation and conducts shoreline monitoring every three years to ensure that no known or potential archaeological sites are threatened by erosion events.

Recreational resources at the project include a canoe portage, fishing access, a camping area which is restricted to canoe/kayak through boaters for one night maximum, and a picnic area. Public access is provided free of charge.

PLUS-标准型： Criterion for LIHI certification include a PLUS standard for facilities that demonstrate substantial extra efforts in environmental and social mitigation, enhancement, or restoration. This project has achieved a PLUS standard by voluntarily making significant revisions to the Passumpsic River Canoeing and Recreation Guide which provides the public with enhanced knowledge of recreation opportunities both on and off project lands and waters. The collaborative effort of the multi-party interest groups established that the public needed better information to enhance their recreational experiences.

合规状态

当前证书中没有针对设施的特定条件。

2025: No material changes or compliance issues were identified. The project remains in compliance based on the annual review. The project reported that the plant was damaged during the July 2024 500-year flood event, and remains out of service.  Recreation areas were temporarily closed in 2024 for public safety reasons resulting from the flooding and were re-opened in the Fall of 2024.

2024: 未发现任何重大变化或合规问题。根据年度审查，该项目仍然合规。

2023: 未发现任何重大变化或合规问题。根据年度审查，该项目仍然合规。

2022: No material chances or compliance issues were identified. The project remains in compliance based on the annual review. Of note, the next upstream hydro project (Great Falls, P-2839) received a new FERC license in 2020 that increased its minimum bypass flow from 10 to 62 cfs.

2021: There were no report changes or compliance issues. The project remains in compliance based on the annual review.

2020: There were no report changes or compliance issues. The project remains in compliance based on the annual review.

2019: There were no report changes or compliance issues. The project remains in compliance based on the annual review.

2018: The project reported relocation of public parking, pedestrian access, and signage from the powerhouse area to 1/4 mile north at Highway 15 due to vandalism at the original site. A revised recreation plan was approved by FERC in 2017. The project remains in compliance based on the annual review.

2017: 当前证书的年度报告尚未生效。

认证历史

2022 年 1 月 1 日： LIHI 证书期限已根据 2022 年 1 月 1 日发布的 LIHI 第 2 版认证手册 2.05 版延长。有关新期限，请参阅上面的设施表。

August 15, 2018: The decision to recertify the Pierce Mills Hydroelectric Project is final. No appeals were received during the appeal period which closed on August 11, 2018.  The new term for the Pierce Mills Project is from February 6, 2017 through February 5, 2025.

July 12, 2018: The Low Impact Hydropower Institute (LIHI) preliminarily approved the Pierce Mills Hydroelectric Project for a new 8-year term of Low Impact Certification, having earned a PLUS Standard in the Recreation Criteria. This decision is preliminary pending the 30-day appeal window. Only those who commented in the initial application during the 60-day comment period are eligible to file an appeal. Such appeal needs to include an explanation as to how the projects do not meet the LIHI criteria. Appeal requests can be submitted by email to comments@lowimpacthydro.org with “Pierce Mills Hydroelectric Project” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Ave, Suite 2, Lexington, MA 02420. All requests will be posted to the website and the applicant will have an opportunity to respond and any response will also be posted. Requests must be received by 5 pm Eastern time on August 11, 2018.  The full application and reviewer’s report are available below. If no appeal requests are received and the decision becomes final, the new term for the Pierce Mills Project will be February 6, 2017 through February 5, 2025.

June 11, 2018: The Pierce Mills certification term has been extended again to September 30, 2018.

April 3, 2018: The Pierce Mills certification term has been extended again to June 30, 2018.

2017年11月28日： The Pierce Mills certification term has been extended to March 31, 2018.

December 30, 2016: The Low Impact Hydropower Institute has received a complete application for a new term of Low Impact Certification for the Pierce Mills Hydroelectric project. The application materials can be found in the Files section below. LIHI is seeking public comment on this application.  Specifically, we are interested in knowing whether you think the Pierce Mills project meets the LIHI Low Impact Certification Criteria, as revised in the 2nd Edition Handbook released in March 2016.  Please review the program and criteria in LIHI’s revised 手册 and then review the Project’s 2016 application materials posted below. Comments that are directly tied to specific LIHI criteria (flows, water quality, fish passage, etc.) will be most helpful, but all comments will be considered.  Comments may be submitted to the Institute by e-mail at comments@lowimpacthydro.org with “Pierce Mills Project Comments” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, PO Box 194, Harrington Park, New Jersey 07640.  Comments must be received at the Institute on or before 5 pm Eastern time on March 4, 2017 予以考虑。所有评论都将发布到网站上，申请人将有机会作出回应。任何回应也将发布。

2016年12月16日： The Pierce Mills Hydroelectric project has been granted an extension of the current certificate term. The new expiration date is May 6, 2017. See extension letter for explanation below.

September 9, 2012: The Pierce Mills project has been certified as low impact for a five year term, effective February 6, 2012 and expiring February 6, 2017.

April 6, 2012: Public comment period on application has closed.

February 6, 2012: The Central Vermont Public Service Corporation has submitted an application for the certification of the Pierce Mills project. Public comment period on application has opened.

认证文件

2017 Recertification

2012 Certification

重要文件