Alaska’s tides scouted for clean energy

Last summer, we reported on the progress of a novel hydrokinetic river turbine on the Yukon River. 

This low-head, in-stream hydrokinetic turbine (pictured below) was thought to be the first of its kind placed into commercial operation – a pretty cool designation for the remote towns of Eagle and Eagle Village. 

However, with 44,000 miles of coastline and some of the largest tidal ranges in the world, Alaska’s largest hydrokinetic resources may in its oceans, not its rivers.

Experts estimate that the wave power potential of southern Alaska’s coast alone is nearly 1,250 terawatt-hours (TWh) per year – about 300 times the state’s annual electricity demand. 

Development of these resources in Alaska is likely to be economically feasible in only a few sites, however, and Cook Inlet, the 180-mile stretch of water that connects Anchorage to the Gulf of Alaska, is at the top of that list for its tidal-power possibilities.

The Alaska Energy Authority, a public corporation dedicated to reducing the cost of energy in Alaska, and the National Oceanic and Atmospheric Administration (NOAA) have announced an agreement to conduct a baseline assessment of tidal hydrokinetic energy potential in Cook Inlet. 

According to, NOAA will measure and model the inlet’s water levels and three dimensional current, salinity and temperature fields over several years to identify locations within the inlet with the highest potential for hydrokinetic energy generation.

The study is not the first of its kind in the area. According to the Renewable Energy Alaska Project, Ocean Renewable Power Company (ORPC) obtained a permit to develop a demonstration tidal project in Cook Inlet in 2008.

In its own feasibility study, ORPC says it found that Cook Inlet has the second highest tidal range in North America. The company plans to begin building a commercial hydrokinetic power plant in 2012.

Lauren Craig, EarthTechling