California could generate massive wave and tidal power

image
Author: Bob Morris
Published: 23 Jan, 2012
Updated: 13 Oct, 2022
3 min read

The Department of Energy (DOE) says California has the potential to generate enough power for 14 million homes if its wave and tidal power were fully developed. Even if it was only half of that, it would be a substantial new source of clean renewable energy, all produced a few miles off the California coast.

The DOE studied ocean power nationwide and concluded that up to 15% of all US power could be generated from waves and tides if the west and east coasts, plus Hawaii and Alaska, were fully utilized. That’s a whole lot of untapped power just waiting to be used. Its estimates also include the neglected powerhouse of renewable energy: hydropower. For some reason, hydropower often gets studiously ignored. Yes, dams can have deleterious effects. But Hoover Dam has a nameplate capacity of 2 GW, equal to a big coal or nuclear plant, and supplies power to Arizona, Nevada, and California. Without big hydro, the southwest would be a very different place indeed.

There are actually three types of ocean power, not two. They are wave, tidal, and Ocean Thermal Energy Conversion (OTEC.)  Wave power is generated by the movement of moored devices on the ocean surface. The passing waves move the devices and power is created by hydraulic rams, peristaltic pumps, hydroelectric turbines onshore powered by compressed sea water, and other ways.  Tidal power is created by devices sitting on the ocean floor. They generate power when the tide comes in and out. While tidal power generation is variable, it is also completely predictable. We always know when the tides will be. They too come in a variety of configurations. Some look like giant clam shells, while others resemble wind turbines.  OTEC uses the difference in temperature between deep and surface water to run a heat engine. It works best in areas with big temperatures differential. Hawaii is an ideal location and has an OTEC site on the Big Island.

California has tried before with wave power but was unsuccessful. Lt. Governor Gavin Newsom is a big proponent of ocean power and tried to implement it while mayor of San Francisco. However, PG&E killed test projects after cost overruns and opposition from environmentalists and the fishing industry. The ocean is an unforgiving place. The turbulence is unending and salt corrodes whatever it can. This technology is still in its infancy. So that explains some but not all of the reasons why the US is not utilizing all of its natural resources.

Scotland recently said that it plans to be 100% renewable energy by 2020. They are already well on their way. Not only will they be able to power their entire country with renewables, they will (and already are) selling it to other countries. With their abundant wind, wave, and tides, they are fast becoming the “Saudi Arabia of Renewable Energy.” They have huge amounts of power coming from offshore wind and are on the verge of commercial-scale wind and wave power. The US by contrast, still has no offshore wind. Why is this? We are falling behind Great Britain, Europe, Japan, and China in renewable energy generation and we don’t need to be.

Hopefully the DOE report will spur development of wave and tidal in California and elsewhere. The power is there. We just have to harness it.

Latest articles

CA capitol building dome with flags.
Why is CA Senator Mike McGuire Trying to Kill the Legal Cannabis Industry?
California’s legal cannabis industry is under mounting pressure, and in early June, state lawmakers and the governor appeared poised to help. A bill to freeze the state’s cannabis excise tax at 15% sailed through the State Assembly with a unanimous 74-0 vote. The governor’s office backed the plan. And legal cannabis businesses, still struggling to compete with unregulated sellers and mounting operating costs, saw a glimmer of hope....
03 Jul, 2025
-
7 min read
I voted buttons
After First RCV Election, Charlottesville Voters Back the Reform: 'They Get It, They Like It, They Want to Do It Again'
A new survey out of Charlottesville, Virginia, shows overwhelming support for ranked choice voting (RCV) following the city’s first use of the system in its June Democratic primary for City Council. Conducted one week after the election, the results found that nearly 90% of respondents support continued use of RCV....
03 Jul, 2025
-
3 min read
Crowd in Time Square.
NYC Exit Survey: 96% of Voters Understood Their Ranked Choice Ballots
An exit poll conducted by SurveyUSA on behalf of the nonprofit better elections group FairVote finds that ranked choice voting (RCV) continues to be supported by a vast majority of voters who find it simple, fair, and easy to use. The findings come in the wake of the city’s third use of RCV in its June 2025 primary elections....
01 Jul, 2025
-
6 min read