Surprise, surprise: Wind turbines do lower carbon emissions

Counter-intuitive thinking is counter-intuitive for a reason.

Climate sceptics have long made the counter-intuitive claim that wind turbines don't actually reduce carbon emissions, but data analysed by the Guardian's environment blog suggests that as well as being counter-intuitive, it's just plain false.

The claim the Guardian's Chris Goodall and Mark Lynas investigated relies on the fact that wind power fluctuates with the weather. As a result, when the windspeed drops, gas power stations have to be spun up to provide electricity instead. It has to be gas, because other low-carbon sources of energy either have the same fluctuations as wind, or, like nuclear power, essentially can't be turned off.

The sceptics argue that the need to rapidly turn on the gas generators means that a type of power station known as a "gas-fired open cycle turbine" (OCGT) has to be used. Their key point is that these turbines, which are capable of being put into use extremely quickly, are less efficient than another type of gas generator, a "combined cycle gas turbine" (CCGT). The need to pick up the slack left by wind power, they say, means that so many of these inefficient turbines are used that carbon emissions actually go up compared to the scenario where all the electricity is generated with the more efficient CCGT type.

The Guardian's blog contains a lot of stats taken straight from the National Grid, all of which confirm the intuitive beliefs: wind power replaces fossil fuels. But for the specific claim that it still results in higher carbon emissions, the operative paragraph is the following:

Their arguments are not borne out by current statistics, however. If the sceptics were right, the recent windy conditions would have seen considerable use of less-efficient OCGT as wind input to the grid ramped up and down. In actual fact, during the entire June-September period, OCGTs and equally dirty oil-fired stations produced less than one hundredth of one percent of all UK electricity. In total they operated for a grand total of just nine half hour periods in the first 19 days of the month – and these periods had nothing to do with changing windspeeds.

In other words, the mechanism the sceptics suggested might be at work isn't. The authors go into greater detail about why that is, as well. In essence, it comes down to the fact that wind power isn't actually all that unpredictable. It comes and goes, but we usually have a good few hours warning about when it's going to die down; and it's spread throughout the country, allowing even more flattening of the peaks and troughs in supply.

The bigger reason for having to suddenly spin up big generators isn't sudden drops in supply, but sudden peaks in demand. Take, for example, a World Cup match, where England have made it through to sudden death penalties. The National Grid know there will be a spike in power consumption the minute the match ends, as people get up to put the kettle on – but they can't know when that spike will be until mere seconds before it actually happens. That sort of load will always be problematic to supply with renewables – but it's not much less problematic to supply with fossil fuel either.

Wind turbines. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Everything that is wonderful about The Sun’s HMS Global Britain Brexit boat

And all who sail in her.

Just when you’d suffered a storm called Doris, spotted a sad Ukip man striding around the Potteries in top-to-toe tweed, watched 60 hours of drama about the Queen being a Queen and thought Britain couldn’t get any more Brexity, The Sun on Sunday has launched a boat called HMS Global Britain.


Photo: Newsgroup Newspapers Ltd/Photos published with permission from The Sun

Taking its name from one of Theresa May’s more optimistic characterisations of the UK post-Europe (it’s better than “Red, white and blue Brexit”, your mole grants), this poor abused vessel is being used by the weekend tabloid to host a gaggle of Brexiteers captained by Michael Gove – and a six-foot placard bearing the terms of Article 50.

Destination? Bloody Brussels, of course!

“Cheering MPs boarded HMS Global Britain at Westminster before waving off our message on a 200-mile voyage to the heart of the EU,” explains the paper. “Our crew started the journey at Westminster Pier to drive home the clear message: ‘It’s full steam ahead for Brexit.’”

Your mole finds this a wonderful spectacle. Here are the best bits:

Captain Michael Gove’s rise to power

The pinnacle of success in Brexit Britain is to go from being a potential Prime Minister to breaking a bottle of champagne against the side of a boat with a fake name for a publicity stunt about the policy you would have been enacting if you’d made it to Downing Street. Forget the experts! This is taking back control!


 

“God bless her, and all who sail in her,” he barks, smashing the bottle as a nation shudders.

The fake name

Though apparently photoshopped out of some of the stills, HMS Global Britain’s real name is clear in The Sun’s footage of the launch. It is actually called The Edwardian, its name painted proudly in neat, white lettering on its hull. Sullied by the plasticky motorway pub sign reading “HMS Global Britain” hanging limply from its deck railings. Poor The Edwardian. Living in London and working a job that involves a lot of travel, it probably voted Remain. It probably joined the Lib Dems following the Article 50 vote. It doesn’t want this shit.

The poses

All the poses in this picture are excellent. Tory MP Julian Brazier’s dead-eyed wave, the Demon Headmaster on his holidays. Former education minister Tim Loughton wearing an admiral’s hat and toting a telescope, like he dreamed of as a little boy. Tory MP Andrea Jenkyns’ Tim Henman fist of regret. Labour MP Kate Hoey’s cheeky grin belied by her desperately grasping, steadying hand. Former Culture Secretary John Whittingdale’s jolly black power salute. And failed Prime Ministerial candidate Michael Gove – a child needing a wee who has proudly found the perfect receptacle.

The metaphor

In a way, this is the perfect representation of Brexit. Ramshackle, contrived authenticity, unclear purpose, and universally white. But your mole isn’t sure this was the message intended by its sailors… the idea of a Global Britain may well be sunk.

I'm a mole, innit.