October is Energy Awareness Month!
Join REAP, REAP members, and colleagues at the Alaska Center for Energy and Power and the Alaska Energy Authority for fun events statewide in October. Take part in Energy Awareness Month with our energy efficiency tips!
1.8 MW Wind farm for Tok
Alaska Power and Telephone has announced plans to build a 1.8 MW wind farm near Tok, Alaska. Called 7-Mile Wind, the project is targeted for completion in late 2018 and will provide power to about 1,500 residents in the four rural Interior Alaska communities of Tok, Tetlin, Dot Lake, and Tanacross. The wind farm will be the latest addition to a growing list of 20 + communities across the state already powered by wind. The conceptual design calls for installing two 900 KW turbines on 7-Mile Ridge, which is about 10 miles south of Tok, adjacent to the Glenn Highway. Together the turbines are expected to produce enough power to reduce diesel fuel use in the four communities by 250,000 gallons a year and offset more than 66,650 metric tons of carbon annually. The cost of the project is estimated at $10 million, and will be funded in part by a $3 million High Energy Cost Grant from the United States Department of Agriculture. The utility expects to finalize its financing plan over the next couple months.
Lithium: More than bath salts and mineral water
In 1930, the only markets for lithium were mineral water and Lithia effervescing tablets for rheumatism. Big deal. Today, lithium is so critical for batteries in electric vehicles and personal electronics that recent headlines compel even the risk adverse to call their investment broker: “An increasingly precious metal” (The Economist), “A bold approach in commodities pays off” (Wall Street Journal), or “Hailed as the New Petroleum,” (Forbes). Lithium is so hot, REAP has to write about it again. Tesla isn’t the only firm producing lithium-ion batteries in a gigafactory. So is LG, Samsung and Panasonic. See, lithium batteries are the kryptonite necessary for the clean energy future we are all talking about. Sadly, lithium reserves have not yet been identified in Alaska. Bolivia, Chile, and Argentina hold the lion’s share. The Chinese state-controlled firm CITIQ has aggregated interests in lithium mines internationally. Alaska’s microgrids will benefit from lithium-ion batteries, and urban areas may see more residential storage options like Tesla’s PowerWall. Meanwhile, our insider tip is to invest in funds with lithium in the portfolio.
Erecting a wind turbine in permafrost may be a little more difficult than you think. There are a lot of factors to consider. As the ground softens in the warmer months, the tower may experience a shift in lateral support, changing the relative center of gravity. Turbines cannot settle or tilt in any way or they will first lose efficiency. After that, the equipment will begin to break. The permafrost layer of the earth is constantly fluctuating in depth and distance to the surface. This not only affects the tower itself, but also the construction of the tower. The cranes used to hoist the tower up onto its foundation require leverage, which is sometimes difficult to acquire because of the unstable ground.
The logistics of transporting a crane to a construction site are substantial. Barging a crane to and from a project site is an alternative, but also demands waiting on the weather. Winter sea ice often makes the ocean impassible. To avoid driving on sensitive tundra lands during summer months, cranes used to lift a tower up onto its foundation are often stuck in rural Alaska for the duration of the winter, waiting to drive on the frozen landscape when the light returns. The need for a quick turn around on the crane rental is important for saving money.
There are a few ways to combat these issues. Small-scale “tilt-up” wind towers are available. These do not require a crane at all. Instead, tilt-up towers can be erected with the use of motor/hydraulic equipment or even a four-wheel drive vehicle.
To combat the foundational problems of permafrost, six or more pilings between one-third and two-thirds of the height of the tower may be driven into the ground. To avoid heating the earth, the foundation is generally elevated, allowing cold air to pass over the ground to keep it frozen. All of these solutions work well but are expensive, driving up the cost to erect a wind turbine in remote locations. Wind peaks daily at night and seasonally in the winter. Having a turbine up and ready to produce energy as soon as possible in project development is important in maximizing the return.
Who we are
Renewable Energy Alaska Project is a coalition of energy stakeholders working to facilitate the development of renewable energy in Alaska through collaboration, education, training, and advocacy.