Wednesday, 30 November 2016

UK winter energy supply 2016-17

Following on from my previous post on gas supply, here's an update on the overall energy situation in the UK this winter.

The good news is that the gas storage site at Rough is due to come back online by 9 Dec, according to Centrica. Of course, it's still only 1/3 full, so we're not out of the woods yet.

The bad news is that several nuclear power stations in France have been offline for safety checks for some time now, and the result is that instead of importing up to 2GW of electricity from France, the UK is importing less, or even exporting to France. You can see this live on the graphs at Gridwatch. This extra power is largely coming from our CCGT (gas) power stations, which of course means increased gas use - this was already showing up in the graph I posted a few weeks ago, and has continued since then. (The red line is 2016 - click for a larger version)

It's also proving to be a colder than average winter so far in the UK, so we'll have to wait and see how things turn out over the coming months...

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Thursday, 3 November 2016

Outlook for UK gas supply in winter 2016/17

The UK Met Office has released it's long range outlook for Nov 2016 to Jan 2017, and it's expecting at least the first part of the winter to be a bit colder than average - there's some in depth discussion of it in this BBC video. So now's a good time to review what shape UK gas supplies are in.

A few months ago I commented on the news that the long range storage at Rough was out of action and only about one third full. At the time Centrica was expecting withdrawal from Rough to be possible by 1 Nov, but the latest statement on their website now says second half of November. The graph below (click it for a larger version) shows the storage level in Rough over the past decade, with 2016 in red. As you can see, no gas has been injected for some months, leaving the store short of about 26,000 GWh of gas, which is unprecedented in the past decade.
UK long range gas storage 3nov2016

To be fair, the operators of the medium range storage sites have done their best, with gas stored at record levels - but this only equates to an extra couple of thousand GWh compared to recent years, so does not offset the missing gas from Rough.
UK medium range gas storage 3nov2016

LNG stocks are at a fairly typical level, but these fluctuate as imports arrive periodically - the hope will be that more LNG tankers will arrive this winter than a year ago.
UK LNG stocks 3nov2016

The impact of Rough's outage and low stock is showing up in wholesale gas prices, which have more than doubled over the past two months - this has yet to feed through into consumer bills.
UK gas buy price 3nov2016

The other important factor to bear in mind is what's happening with electricity generation. A significant number of coal-fired power plants have closed in the past year or two, and this is good as they are high emitters of CO2. But the slack has been taken up by gas-fired power plants instead, rather than solely renewable energy or nuclear power. The graph below shows how power station demand for gas is at a multi-year high for this time of year.
UK power station gas demand 3nov2016

So what's the conclusion? Well, if it doesn't get too cold, Rough comes back online as planned, nothing else breaks and we get enough LNG deliveries, then we'll just see prices rise. If one or more of those factors doesn't work out favourably, then it may become necessary to restrict industrial gas or electricity usage, to ensure that gas supply to homes can be maintained. Let's hope and pray that we don't get another winter like 2010/11:


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