A corroded circular saw blade from the Oliver Grist & Shingle mill on the West Branch of Robinhood Cove, in Georgetown, Maine (US-ME-071 in the TMI database), has what appears to be a reinforcing hub. TMI’s Harry Hopcroft asks if anyone can provide information about this blade configuration. Was this center hub, apparently attached to the blade with bolts, common on circular saw blades, or was it a special construction for sawing shingles?

The blade is 34 inches in diameter and the center hub is 14 inches in diameter. The spindle hole is 2 inches. The main blade is only 1/8-inch thick, while the add-on hub is 1/2-inch thick at the spindle and tapers to nothing at its edges.

If you can shed light on this type of blade construction, please comment (see link below) or send email to info@tidemillinstitute.org.

On its online media platform, POWERHOUSE, The National Hydropower Association has just published an article by TMI’s David Hoyle explaining how Tide Mill Institute promotes development and use of tidal energy. “How Tide Mill Institute Preserves and Promotes Tidal Energy” outlines how the organization, as part of its mission, promotes re-use of old tide mill sites and development of tidal energy sources.

TMI takes four approaches to fostering tidal energy:

• Advances appreciation of the American and international heritage of tide mill technology.
• Encourages research into the location and history of tide mill sites.
• Serves as a repository for tide mill data for students, scholars, engineers and the general public and to support and expand the community of these tide mill stakeholders.
• Promotes appropriate re-uses of old tide-mill sites and the development of the use of tides as an energy source.

The article includes examples of current TMI efforts to implement tidal power, including active membership in the National Hydropower Association.

Read the complete article in POWERHOUSE

Tide mill enthusiasts who may want to expand their mill interests beyond tide power to those powered by rivers and wind should consider attending the September annual conference being organized by The Society for the Preservation of Old Mills (SPOOM) in Auburn, N.Y. (30 miles west of Syracuse). SPOOM is a long-time ally of Tide Mill Institute in preserving and studying historic mill sites, and it has many members in common with TMI.

The conference, September 7-9, includes two days of mill tours. On this year’s agenda are Pure Functional Food, Birkett Mills, Farmer Ground Flour, Ward O’ Hara Museum, and New Hope Mills historic and modern facilities.

A video produced and shown to selected audiences earlier this year is now available on line via the Tide Mill Institute’s YouTube channel. Sponsored by the Tide Mill Institute and Kennebunk Savings, the one-hour video, “The Tide Mills of the York River,” explores the remains of several York, Maine, tide mills using aerial drone photography and interviews with historians. The video includes an explanation of how tide mills work by Bud Warren, co-founder of TMI.

The first tide mill was erected on the York River in the early 1600s when Fernando Gorges sent men to the area for the purpose of building grist mills and saw mills. Tide mills continued operating on or near that river until the late 1800s or early 1900s.

Compiled by David Hoyle, Tide Mill Institute

General Interest

Volume 4 Issue 3 March – Hydro Leader
This marine energy issue of Hydro Leader magazine includes an informative interview with Stuart Davies, CEO of Ocean Renewable Power Corporation. Also included are some worthwhile interviews with other tidal and wave energy entrepreneurs.

USA

Tapping the power of the sea: Company to begin testing tidal systems again
ORPC plans to begin testing their Advanced TidGen device in Cobscook Bay starting in May 2023. It will use an existing bottom support frame, and will generate 100-120 kW of power (to be dissipated as heat). ORPC will move operations to the Western Passage in 2025, implementing a full scale system with four turbines. They also plan to develop their 1-2 MW Optimor system in Western Passage. They have an agreement with Versant Power for up to 5 MW of power. ORPC also has a DOE Energy Transitions Initiative Partnership Project or ETIPP project with Eastport for a smart micro-grid integrating tidal and solar power with battery storage.

Earthrise | Tidal energy in the Salish Sea
Interesting article about a project involving Orbital Marine Power (see below under UK) around the San Juan Islands in the Salish Sea off of Washington state.

Canada

Tidal power developer slams DFO for years of delays, stops application for N.S. project | CBC News
Sustainable Marine Power announced recently that they have scrapped plans for expanded deployment at the Fundy Ocean Research Center for Energy (FORCE) test site due to permitting issues. This is seen as a blow to the tidal power industry at large.

Continue reading “Tidal Energy News Update: January – April 2023” →

After shutting down in 2022 when its pit wheel became loose on the water wheel axle, a historic tide mill in Totten, Hampshire, England, is once again producing flour with power provided by the tides. Eling Tide Mill is one of only a few tide mills in the world still producing flour regularly, according to the mill’s website.

A tide mill may have existed on the site as early as Roman times and the current building is more than 200 years old. The mill ceased operation in 1946, but restoration to an operating flour mill started in 1975 and it officially opened as a working museum in 1980. After the 2022 shutdown, repairs to the pit wheel began in November, 2022, and the mill was operating again by early February. Additional repairs are planned and may require some brief shutdowns in the near future.

Peter Ramm, miller at Eling, has provided a report on the repair. You can read it by clicking here.