## Concrete battery

We are the Borg.
ceptimus
Posts: 1145
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Location: UK

### Re: Concrete battery

This one in France has been working for about fifty years. https://en.wikipedia.org/wiki/Rance_Tidal_Power_Station

It's supposed to have paid for itself and produces electricity cheaper than nuclear. But it has killed all the sand eels and plaice, and it's silted up the river.

ed
Posts: 35372
Joined: Tue Jun 08, 2004 11:52 pm
Title: The Hero of Sukhbataar

### Re: Concrete battery

Anaxagoras wrote:
Fri Aug 09, 2019 12:37 pm
The problem with tides is that nobody can explain them.
And they wait for no man.
Wenn ich Kultur höre, entsichere ich meinen Browning!

ed
Posts: 35372
Joined: Tue Jun 08, 2004 11:52 pm
Title: The Hero of Sukhbataar

### Re: Concrete battery

Rob Lister wrote:
Fri Aug 09, 2019 2:21 pm
ed wrote:
Fri Aug 09, 2019 12:35 pm
Why not a massive armature that rides on pylons set in an area with large tides. Tide comes in, fucker goes up, generates power. Tide goes out, the reverse (except for the power generation).

It occurs to me that the output would be a sinusoid with a period of 8 hours.
I think the mechanical leverage required for a massive float to turn a generator in response to the tides makes that very impractical. Something more extreme, for example, would be anchoring a cable and generator on both sides of the San Andreas Fault.

But there are tidal generators. Their major issues are cost, saltwater corrosion, and barnacles.
Not turn, pass windings thru a field. up down.
Wenn ich Kultur höre, entsichere ich meinen Browning!

sparks
Posts: 15258
Joined: Fri Oct 26, 2007 4:13 pm
Location: Friar McWallclocks Bar -- Where time stands still while you lean over!

### Re: Concrete battery

ceptimus wrote:
Fri Aug 09, 2019 8:24 pm
This one in France has been working for about fifty years. https://en.wikipedia.org/wiki/Rance_Tidal_Power_Station

It's supposed to have paid for itself and produces electricity cheaper than nuclear. But it has killed all the sand eels and plaice, and it's silted up the river.
I stand corrected. Thanks ceptimus!
You can lead them to knowledge, but you can't make them think.

Witness
Posts: 21398
Joined: Thu Sep 19, 2013 5:50 pm

### Re: Concrete battery

More tidal power:

World’s most powerful tidal turbine to be made in Dundee

Scottish engineering firm Texo Group has won a multi-million-pound contract to manufacture a record-breaking tidal turbine for Orbital Marine Power.

Named O2, the tidal turbine is meant to become the most powerful in the world when it enters operation in 2020 as part of a long term project at European Marine Energy Centre (EMEC). It features several innovations focused on further reducing the cost of energy from the company’s disruptive technology

The tidal turbine builds on the successful 2MW SR2000 turbine which generated over 3GWh in its first year of testing at the EMEC in Orkney, Scotland.

“This is a flagship engineering project for the emerging tidal sector and we are delighted to be working with TEXO Group to showcase the very capable supply chain we are fortunate to have around us in Scotland and the wider UK,” said Orbital’s CEO, Andrew Scott.

Texo will carry out the manufacturing at its quayside facility in Dundee.
[…]
The O2 project has been financed in a number of ways including EU Horizon 2020 funding and a £7m crowdfunding bond which Orbital successfully raised at the start of the year, one of the largest peer-to-peer debentures in UK history. The project also benefits from previously offered market support for the sector via the Renewable Obligation.
https://www.pesmedia.com/texo-group-tid ... -power-o2/

https://orbitalmarine.com/technology-de ... orbital-o2

Anaxagoras
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### Re: Concrete battery

Won't that thing kill a lot of fish and other marine animals?
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

sparks
Posts: 15258
Joined: Fri Oct 26, 2007 4:13 pm
Location: Friar McWallclocks Bar -- Where time stands still while you lean over!

### Re: Concrete battery

And the noise it makes will fuck Trumps ability to tweet at 3AM...

Just sayin'.
You can lead them to knowledge, but you can't make them think.

Rob Lister
Posts: 20812
Joined: Sun Jul 18, 2004 7:15 pm
Title: Incipient toppler
Location: Swimming in Lake Ed

### Re: Concrete battery

Anaxagoras wrote:
Wed Aug 14, 2019 3:47 am
Won't that thing kill a lot of fish and other marine animals?
Maximum rotor speed is only 16rpm. I doubt it is any more dangerous than a slow-moving ship propeller.

It's hard to hate it but I can nitpick it.
The tidal turbine builds on the successful 2MW SR2000 turbine which generated over 3GWh in its first year of testing at the EMEC in Orkney, Scotland.
Nameplate capacity is 2MW but generation is 3GWh/yr which works out to 342KW static (3GWh/364/24). That's a capacitor factor of only 17%. Solar is typically 25%. Why is it so low?

According to the specs
https://orbitalmarine.com/technology-development/sr2000
the Cut-in Current Speed is 1 m/s, and that is probably one reason the capacity factor is so low. Consider a typical tidal waveform:

During the positive and negative peaks, the water isn't moving. But that only accounts for 20% or so. Donno. It was only a proof-of-concept machine so I suppose they get some slack. Will the new one be better?

Cost of the SR2000 was £5.7 million (~$7m) which works out to a build cost of$20/w (7m/342k).

Abdul Alhazred
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Joined: Mon Jun 07, 2004 1:33 pm
Title: Yes, that one.
Location: Chicago

### Re: Concrete battery

sparks wrote:
Wed Aug 14, 2019 6:30 am
And the noise it makes will fuck Trump's Cthulhu's ability to tweet at 3AM...

Just sayin'.
FTFY HTH
The arc of the moral universe bends towards chaos. -- Abdul Alhazred