This group brings together the best thinkers on energy and climate. Join us for smart, insightful posts and conversations about where the energy industry is and where it is going.


Energy Innovation: US Could Tap Into 1400 Terawatt Hours Of Clean Ocean Power

Tina Casey's picture /
  • Member since 2018
  • 60 items added with 32,017 views
  • Aug 31, 2013 9:30 pm GMT

Your access to Member Features is limited.

As the US offshore wind power industry slowly (very slowly) cranks up to speed, let’s not forget that US coastal waters also represent a huge, as-yet-untapped energy resource in the form of waves, tides and currents. The Department of Energy estimates the total could come up to 1400 terawatt hours of electricity per year, enough to power millions of homes. The problem is getting the private sector to take the plunge into uncharted technological waters, and to that end DOE has just announced a new round of $16 million funding, including public-private partnerships, to help kick things into gear.

The money will go to 17 projects that cover efficiency improvements in wave and tidal generators as well as data collection and environmental surveys.

More And Better Tidal and Wave Power

Descriptions of the 17 projects are available here, and since the recipients include a couple of companies that CleanTechnica has been following let’s focus on those.

Ocean Renewable Power Company laid claim to launching the first grid-connected commercial tidal energy project in the US last year, called TideGen. The company will get $1.93 million to develop an advanced control system that will predict tidal conditions, with the goal of improving turbine performance when tidal conditions are extremely rough and less than optimal.

Tidal power system by Ocean Renewable Power Company

Tidal power system courtesy of ORPC.

The company will get another $3 million to develop advanced components for wave, tidal and current generators, to measure performance, and to assess how these components can be incorporated into existing technology.

Ocean Power Technologies has been working extensively with the US Navy on a buoy-based wave power system called PowerBuoy, and it will get $1 million to redesign the float for the device, as well as its spar (the cylindrical body encapsulating the device). The goal is to improve efficiency and reduce production costs by cutting down on float and spar mass, which together account for about half the total mass of the PowerBuoy.

Speaking of the Navy, though Ocean Renewable Energy can lay claim to the first commercial grid connection for tidal power, it looks like the Navy and Ocean Power nailed wave power grid connection back in 2010, at Marine Corps Base Hawaii, in Oahu.

The Navy has also been ramping up facilities at its existing wave power test bed in Hawaii with the goal of providing an up-to-date shared R&D platform for private sector wave power developers.

More Power, Less Impact

A significant chunk of the new round of funding will go to assess impacts on marine life. The Electric Power Research Institute, for example, will get $300,000 to assess the potential impact of undersea electromagnetic fields  from transmission lines, and the University of Washington will get $400,000 to assess the impact of noise from tidal devices specifically on marine mammals including killer whales, porpoises and seals.

Another notable project comes under Oak Ridge National Laboratory, which will get $95,000 to study the impact of tidal turbines on fish populations, based on the operation of an existing tidal power project in New York City by the company Verdant Power. The goal is to develop assessment tools that can be used at other tidal and riverine sites.

Don’t Forget The Inland Waterways!

This round of funding focuses mainly on wave and tidal power along US coasts, but the Obama Administration has also been looking to tap America’s inland waterways as a significant source of low-impact renewable energy. That includes modifying existing dams to extract more power as well as developing hydrokinetic devices that generate power from ambient currents rather than requiring new dam construction.

To help accelerate the private hydrokinetic sector, the Obama Administration is also funding a new shared research and development facility called RiverSphere at Tulane University in Louisiana.

Yet Another Nail In The Keystone XL Coffin

If there is one dead horse worth beating it’s the notorious Keystone XL tar sands oil pipeline proposal, which advocates have touted as an essential job-creating machine even though it will only account for a few dozen permanent positions in the US, virtually none of which involve innovative technology.

Contrast that with all of the current and potential activity surrounding wave, tidal and current energy development in the US, and the job-creating pitch disappears in a puff of smoke.

The pipeline also creates new risks to hundreds of waterways along its route from Canadian tar sands fields to Texas refineries without adding a drop to the domestic energy market (it’s an export project, after all), so in effect US consumers bear all the risk and none of the benefits from this energy project — again, compared to marine and riverine power development, which can tie directly into local grids.

With the US investing billions in both private and public sector dollars for new clean technology designed to reduce greenhouse gas emissions, it’s also worth noting that fossil fuel projects like Keystone essentially nullify those efforts, which the Sierra Club and several other environmental heavy-hitters hope to demonstrate once and for all in a new report on the global warming impact of Keystone.

US Taps Into 1400 Terawatt Hours Of Clean Ocean Power was originally published on: CleanTechnica. To read more from CleanTechnica, join over 30,000 others and subscribe to our RSS feed, follow us on Facebook, follow us on Twitter, or visit our homepage.

Tina Casey's picture
Thank Tina for the Post!
Energy Central contributors share their experience and insights for the benefit of other Members (like you). Please show them your appreciation by leaving a comment, 'liking' this post, or following this Member.
More posts from this member
Spell checking: Press the CTRL or COMMAND key then click on the underlined misspelled word.
John Miller's picture
John Miller on Sep 1, 2013

The challenge of tapping tidal and wave energy is not the feasibility, but once again energy density.  Tapping this rather dilute form of energy will face the same barrier it’s faced for decades, extremely high cost per KWH.  Not only are the various technologies challenged by the relatively poor efficiency of these types of power generation (i.e. very high capital cost per delivered KWH capacity), but other issues are likely to be major barriers including very high maintenance costs (the oceans are highly corrosive and fouling environments), and the relatively low energy density and low electric power generation voltage creates very high gathering & distribution power line system losses (very inefficient power grid connections).  The major positive factor with this source of electric power supply is that it is generally predictable and can feasible displace dispatchable baseload coal and natural gas power generation.

Any comparison to the benefits and economics of the Keystone XL pipeline project is like comparing apples and oranges.  Renewable electric power generation will not significantly affect petroleum consumption for many decades or until EV’s become a very significant part of existing LDV fleets.  Rather than dedicating the funds towards low energy density tidal and wave projects, the available and limited R&D funds could be better spent on the development of alternatives to fossil fuels, such as being directed towards EV/battery technologies R&D.  

John Murray's picture
John Murray on Sep 1, 2013

It takes more energy to extract and refine tar sands oil, leading to a higher carbon footprint than regular oil. Ocean energy would provide so much that we need, and would be a breakthrough. It can happen.

Get Published - Build a Following

The Energy Central Power Industry Network is based on one core idea - power industry professionals helping each other and advancing the industry by sharing and learning from each other.

If you have an experience or insight to share or have learned something from a conference or seminar, your peers and colleagues on Energy Central want to hear about it. It's also easy to share a link to an article you've liked or an industry resource that you think would be helpful.

                 Learn more about posting on Energy Central »