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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Let's seize our chance of a progressive alliance in Richmond - or we'll all be losers

Labour MPs have been brave to talk about standing aside. 

Earlier this week something quite remarkable happened. Three Labour MPs, from across the party’s political spectrum, came together to urge their party to consider not fielding a candidate in the Richmond Park by-election. In the face of a powerful central party machine, it was extremely brave of them to do what was, until very recently, almost unthinkable: suggest that people vote for a party that wasn’t their own.
Just after the piece from Lisa Nandy, Clive Lewis and Jonathan Reynolds was published, I headed down to the Richmond Park constituency to meet local Green members. It felt like a big moment – an opportunity to be part of something truly ground-breaking – and we had a healthy discussion about the options on the table. Rightly, the decision about whether to stand in elections is always down to local parties, and ultimately the sense from the local members present was that it would be difficult  not to field a candidate unless Labour did the same. Sadly, even as we spoke, the Labour party hierarchy was busily pouring cold water on the idea of working together to beat the Conservatives. The old politics dies hard - and it will not die unless and until all parties are prepared to balance local priorities with the bigger picture.
A pact of any kind would not simply be about some parties standing down or aside. It would be about us all, collectively, standing together and stepping forward in a united bid to be better than what is currently on offer. And it would be a chance to show that building trust now, not just banking it for the future, can cement a better deal for local residents. There could be reciprocal commitments for local elections, for example, creating further opportunities for progressive voices to come to the fore.
While we’ve been debating the merits of this progressive pact in public, the Conservatives and Ukip have, quietly, formed an alliance of their own around Zac Goldsmith. In this regressive alliance, the right is rallying around a candidate who voted to pull Britain out of Europe against the wishes of his constituency, a man who shocked many by running a divisive and nasty campaign to be mayor of London. There’s a sad irony in the fact it’s the voices of division that are proving so effective at advancing their shared goals, while proponents of co-operation cannot get off the starting line.
Leadership is as much about listening as anything else. What I heard on Wednesday was a local party that is passionate about talking to people and sharing what the Greens have to offer. They are proud members of our party for a reason – because they know we stand for something unique, and they have high hopes of winning local elections in the area.  No doubt the leaders of the other progressive parties are hearing the same.
Forming a progressive alliance would be the start of something big. At the core of any such agreement must be a commitment to electoral reform - and breaking open politics for good. No longer could parties choose to listen only to a handful of swing voters in key constituencies, to the exclusion of everyone else. Not many people enjoy talking about the voting system – for most, it’s boring – but as people increasingly clamour for more power in their hands, this could really have been a moment to seize.
Time is running out to select a genuine "unity" candidate through an open primary process. I admit that the most likely alternative - uniting behind a Liberal Democrat candidate in Richmond Park - doesn’t sit easily with me, especially after their role in the vindictive Coalition government.  But politics is about making difficult choices at the right moment, and this is one I wanted to actively explore, because the situation we’re in is just so dire. There is a difference between the Conservatives and the Lib Dems. Failing to realise that plays into the hands of Theresa May more than anyone else.
And, to be frank, I'm deeply worried. Just look at one very specific, very local issue and you’ll perhaps understand where I'm coming from. It’s the state of the NHS in Brighton and Hove – it’s a system that’s been so cut up by marketisation and so woefully underfunded that it’s at breaking point. Our hospital is in special measures, six GP surgeries have shut down and private firms have been operating ambulances without a license. Just imagine what that health service will look like in ten years, with a Conservative party still in charge after beating a divided left at another general election.
And then there is Brexit. We’re hurtling down a very dangerous road – which could see us out of the EU, with closed borders and an economy in tatters. It’s my belief that a vote for a non-Brexiteer in Richmond Park would be a hammer blow to Conservatives at a time when they’re trying to remould the country in their own image after a narrow win for the Leave side in the referendum.
The Green party will fight a passionate and organised campaign in Richmond Park – I was blown away by the commitment of members, and I know they’ll be hitting the ground running this weekend. On the ballot on 1 December there will only be one party saying no to new runways, rejecting nuclear weapons and nuclear power and proposing a radical overhaul of our politics and democracy. I’ll go to the constituency to campaign because we are a fundamentally unique party – saying things that others refuse to say – but I won’t pretend that I don’t wish we could have done things differently.

I believe that moments like this don’t come along very often – but they require the will of all parties involved to realise their potential. Ultimately, until other leaders of progressive parties face the electoral facts, we are all losers, no matter who wins in Richmond Park.


Caroline Lucas is the MP for Brighton Pavilion.