LIHI Certificate #99 - Middlebury Lower Project, Vermont

Middlebury Lower Project, LIHI #99
項目名稱 Middlebury Lower
理海證書編號 99
LIHI 證書期限
 February 6, 2017 – February 5, 2027
擁有者 Green Mountain Power Corporation
狀態 佛蒙特
地點 Located at river mile 24.7 on the Lower Falls of the Otter Creek, roughly one mile downstream from Middlebury Village in the towns of Middlebury and Weybridge in Addison County, Vermont.
裝置容量 2..15 MW
平均年發電量 8,643 MWH
設施類型 徑流
聯邦能源監管委員會 不。 P-2737 issued in 2001, expires 07/31/2031

The Middlebury Lower Project is located on the Lower Falls of Otter Creek roughly one mile downstream from Middlebury village in the towns of Middlebury and Weybridge, in Addison County, Vermont. The project first started generating power in 1917 but during the initial watering of the turbines, the 發電站 collapsed. The powerhouse was rebuilt, and the project was back in service in 1920. The Proctor development, part of the Otter Creek Project (LIHI #128) is located approximately 39 miles upstream. Just downstream are the Beldens and Huntington Falls developments, part of the Otter Creek Project (LIHI #128)。這 Weybridge Project (LIHI #98) is located about 5 miles downstream and the Vergennes Project (LIHI #134) is located another 12 miles downstream and is the first 壩 on the river upstream of the confluence with Lake Champlain. The Middlebury Lower project is the fifth most downstream of eight dams located on the Otter Creek. The project is owned by Green Mountain Power (GMP), the first energy utility certified as a B-Corporation.

The project includes two dams, 溢洪道 sections, intake 運河, powerhouse, three turbines, and interconnection equipment.

The two concrete 重力壩 impound the east and west river channels that diverge around a small island. The dam is 30-feet-high and 478-feet-long, with two 弧形 spillway sections, a 123-foot-long western spillway section, and a 260-foot-long eastern spillway section. The intake canal is 400-feet-long, 40-feet-wide, and controlled by a gate structure containing two 23-foot-wide, 13-foot-high 蓋茲. The powerhouse is located at the downstream end of the intake canal and equipped with steel trashracks having a 1.75-inch clear spacing. The powerhouse includes three 混流式水輪機 units with a total installed capacity of 2.04 MW.

該項目運營於 徑流 mode and impounds a 16-acre reservoir. The project provides a minimum flow of 157 cfs into the approximate 750-foot-long bypass reach, and impoundment fluctuations are limited to 1-inch from the crest of the dam. Project operation relies upon inflows from upstream developments. This flow regime was developed in collaboration with Vermont Agency of Natural Resources (VANR) using data from an Instream Flow Incremental Methodology study. This study evaluated habitat conditions in the bypassed reach with varying flows.

Waters within the project reach are designated as Class B and impaired for e. coli, nutrients, sediment, and PCB contamination. Class B waters are managed to achieve a high level of quality habitat for aquatic biota, fish, and wildlife as well as waters that consistently exhibit good aesthetic value and supports primary contact recreation.

Historically, migratory fish have ascended many of the Lake Champlain tributaries to access spawning waters. While landlocked Atlantic salmon exist in the lake and are stocked in lower Otter Creek, natural populations of Atlantic salmon were 消滅的 from the Lake Champlain Basin over 150 years ago. Otter Creek is managed to support both cold-water and warm-water fisheries. The river reach upstream of the project has extensive wild trout populations and supports resident fish including bass, perch, sucker, brown bullhead, sunfish, and various minnow species. Passage facilities have yet to be prescribed by resource agencies. The project has trashracks with 1.75-inch spacing to mitigate the potential for 夾帶.

The project lands consist of roughly four acres. The surrounding lands are primarily forested with patches of wooded and emergent 濕地 along the river’s edge. Further upstream the area is developed with industrial and commercial buildings and rural residential housing. No lands of significant ecological value exist in the project area.

Threatened or endangered species potentially present in the project vicinity include the Indiana Bat, Northern Long-eared Bat, Flutedshell Mussel, Pocketbook Mussel, Giant Floater, Creek Heelsplitter, Frank’s Love-grass, Gray’s sedge, and Cuckoo flower. Consultation with VANR has confirmed that project operations do not impact listed plant species. VANR also confirmed that if project operations continue with run-of-river operations as prescribed by resource agencies, the project will not impact any of the listed species.

Historic properties in the project area include the project infrastructure, which is eligible for listing on the 國家歷史遺跡名錄. The project operates under a historic properties management plan which addresses protective measures for the historic properties at the project site. The project annually reports activities and updates relevant to the plan to FERC and the Vermont Division for Historic Preservation to ensure proper stewardship of the resources.

Recreational resources at the project include a picnic area, canoe portage, and hiking trails. The project provides public access free of charge.

合規狀態

此證書包括以下設施特定條件：

條件一： The Facility owner shall refine the Project’s operations plan in consultation with VDEC to seek to minimize the effects of Project shutdown on 頭 pond fluctuation and spill rates, and shall develop drawdown rate procedures for water level and flow management during maintenance and repair activities for the protection of state-listed freshwater mussel species. The revised operations plan shall be submitted to LIHI within 60 days of approval. If consultation and plan refinement are not completed by December 31, 2019, the Facility owner shall provide a status update in annual compliance submittals to LIHI.

2024: No material changes or compliance issues were identified. The project remains in compliance based on the annual review.  For Condition 1, the project reported that construction activities were recently completed and consultation with VDEC will be resumed.

2023: No material changes or compliance issues were identified. The project remains in compliance based on the annual review.  For Condition 1, the project reported further delays in consultation with VDEC until after construction activities related to powerhouse tailrace pier repairs are complete in 2023 and normal operations of the Project resume.

2022: No material changes or compliance issues were identified. The project remains in compliance based on the annual review. The project reported no change in the status of Condition 1.

2021: For Condition 1, the project reported development of a draft revised operations plan in internal review prior to submittal to VDEC. The project remains in compliance based on the annual review.

2020: For Condition 1 which became effective in 2019, the project reported initiation of consultation with VDEC on the operations plan. The project remains in compliance based on the annual review.

2019: 沒有報告變更或合規問題。根據年度審查，該項目仍符合規定。

2018: 沒有報告變更或合規問題。根據年度審查，該項目仍符合規定。

2017: 目前證書的年度報告尚未生效。

認證歷史

2022 年 1 月 1 日： 根據 2022 年 1 月 1 日發布的 LIHI 第二版認證手冊第 2.05 版，LIHI 證書期限已延長。

May 15, 2019: The decision to recertify the Middlebury Lower Hydroelectric Project is final. No appeals were received during the appeal period which closed on May 11, 2019. The new certification term for the Project is from February 6, 2017 through February 5, 2022.

April 10, 2019:  The Low Impact Hydropower Institute (LIHI) has preliminarily approved Low Impact Certification for the Middlebury Lower Hydroelectric Project, LIHI Certificate #99 for a new 5-year term. This decision is preliminary pending the 30-day appeal window. Only those who commented on 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 Project does not meet the LIHI criteria. Appeal requests can be submitted by email to 評論@lowimpactHydro.org with “Middlebury Lower Hydroelectric Project” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Ave, Suite 6, Lexington, MA 02420. All requests will be posted to the website.  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 May 11, 2019.  The full application and reviewers report are available below.

November 12, 2018: The Middlebury Lower Hydroelectric project has been granted another extension of the current certificate term. The new expiration date is March 31, 2019.

June 11, 2018: The Middlebury Lower Hydroelectric project has been granted another extension of the current certificate term. The new expiration date is December 31, 2018.

August 31, 2017: The Middlebury Lower Hydroelectric project has been granted another extension of the current certificate term. The new expiration date is March 31, 2018.

May 17, 2017: LIHI has received an application for a new term of Low Impact Certification for the Middlebury Lower Hydroelectric project.  LIHI is seeking public comment on this application.  Specifically, we are interested in knowing whether you think the Middlebury Lower 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 手冊 and then review the Project’s 2016 application materials posted on the project page. Comments that are directly tied to specific LIHI criteria (flows, water quality, 魚道等等）將非常有幫助，但所有評論都會被考慮。意見可以透過電子郵件提交給研究所 評論@lowimpactHydro.org with “Middlebury Lower 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 July 16, 2017 予以考慮。所有評論都將發佈到網站上，申請人將有機會回應。任何回應也將被發布。

December 16, 2016: The Middlebury Lower Hydroelectric project has been granted an extension of the current certificate term. The new expiration date is August 6, 2017. See extension letter for explanation below.

November 29, 2012: The Middlebury Lower 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: Central Vermont Public Service (CVPS) has submitted an application for the certification of its Middlebury Lower Project. Public comment period on application has opened.

認證文件

2017-2019 Recertification

2012 Certification

關鍵文件