The Titanic scale of floating wind turbines quantified – Watts Up With That?

From CFACT

By David Wojick

My regular readers know that I have often referred to the huge size of floating wind turbine assemblies. They are much bigger than fixed offshore wind turbine assemblies because there is a big float attached. This makes floating wind far more expensive than fixed wind, which is already far more expensive than reliable fuel-fired electric power.

Simple physics says that if you want to put a 2,000-ton generator on top of a 500-foot tower with three 300-foot wings attached on a boat and have it still stand up in hurricane-force winds, it will have to be a mighty big boat.

Happily, Philip Lewis from strategic analyst Intelatus has put some numbers on this nonsense in Offshore Engineer.

See https://www.oedigital.com/news/504812-addressing-the-challenges-of-developing-floating-wind-at-scale

And https://www.oedigital.com/news/514835-preparing-for-floating-wind-leveraging-the-oil-gas-supply-chain

Of course, these are just estimates based on proposed designs, not measurements. Keep in mind that no one, anywhere, has ever built one of these Titanic monsters. Governments are setting huge targets for a technology that does not exist.

Based on UK permit applications, we are looking at a colossal individual floater footprint of around 160,000 square feet. That is roughly three football fields, so a mighty big float. And the UK does not get anything like hurricane-force winds. Maybe 100 mph, but never 160.

Weight-wise, Lewis suggests up to 5,000 tons of steel or 20,000 tons of concrete per float. Mind you, 5,000 tons of steel floaters will not keep 2,000 tons on a tall pole upright. These designs are what are called “semi-submersible”. This means the Titanic float is something like half full of water. There is enough air to float it but also a lot of water to hopefully weigh it down. I have yet to see the math on all this and have my doubts about its viability, but this is what is reported.

Of course, these huge floaters make floating wind power extremely expensive. The guess is at least three times as much as the already ridiculously expensive fixed-bottom offshore wind power. It could be a lot more.

These enormous numbers are based on 15 MW turbines, which are the biggest built today, although none has yet been installed and operational offshore. But bigger are coming with 18 MW on order and 20 MW advertised. Floater size and weight scale exponentially with turbine weight and height, so the above huge numbers may actually be quite small.

As an engineer, I would build a few of these monster floating assemblies and run them through a few hurricanes to see how they did, especially if they survived. Of course, the hell-bent Biden folks and green States are doing nothing like that.

For example, next month, Biden’s Bureau of Ocean Energy Management is selling 15,000 MW of floating wind leases in the Gulf of Maine. California just announced a 25,000 MW floating wind target with 5,000 MW already leased by BOEM.

Just to play with numbers, this 40,000 MW of floaters would take just under 3,000 of these monster 15 MW floaters. In addition to filling up a lot of surface ocean, each has to be anchored to the sea floor with at least three mooring cables, more likely around eight each. Plus each has a live wire cable transmitting its energy output.

Lewis says the depths involved are like this: “In the U.S., the first commercial-scale projects will be off California (500-1,300 meters). Future activity is planned off Oregon (550-1,500 meters), the Gulf of Maine (190-300 meters), and the Central Atlantic (over 2,000 meters).” A mile is roughly 1,600 meters.

So we have many millions of feet of mooring cables and hot wires filling the ocean between the floaters and the sea floor. This is a whole new form of harassment that needs to be authorized (or not) under the Marine Mammal Protection Act.

What is really funny is I see no plans for building these thousands of Titanic floating wind assemblies. I recently pointed out that the Biden Transportation Dept was illegally diverting almost a billion dollars to build floating wind fabrication facilities in Maine and California. But, neither facility design has what it would take to actually make this stupendous semi-submersible junk, starting with dry docks.

I strongly suggest we put a big hold on leasing and funding floating wind technology. Let’s first see how and if it works and at what cost.