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11 July 2009
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You are in: Dorset > Places > Places features > Dorset's new gas pipeline

Aerial view of Portland port

14 caverns will be dug under the sea

Dorset's new gas pipeline

It's one of Dorset's biggest ever engineering projects. Fourteen gas-storage caverns will be dug under the sea at Portland, and will connect to the national grid via an 18km pipeline.

A £500m project to create 14 gas storage caverns 1.5 miles (2.4km) under the Dorset coast will now begin work "in July", says the company behind the scheme.

Route of pipeline

The pipeline will be 18km long

The new pipeline will run from Mappowder, north of Dorchester, to Portland, where the caverns to store the gas will be dug under the sea at Upper Osprey Quay.

The plans received the green light last year, when Chief Executive of Portland Gas Ltd, Andrew Hindle, said: "I'm delighted that it's been approved. We've worked really hard for the last four years to get to this stage."

Engineers will dissolve salt deposits and dig out chalk to create a space to store the gas at times of low demand.

At peak demand times the gas would be piped along the line to connect to the national grid at Mappowder.

It's estimated each cavern at Osprey Quay, the former naval base, will take 22 months to dig.

Diagram of how the caverns will store the gas.

Diagram of how the caverns will store the gas.

The first gas will be stored in 2013, with the project complete by 2015, by which time it will store 1% of the national grid's supply.

Pump and brine

There will also be a storage area at West Stafford to pump brine into the pipeline and caverns to ensure the vacuum, created once the gas is taken away, is filled.

Portland Gas is also setting up a trust for community projects. They include transforming a derelict engine shed on Portland into an interpretation centre and using some of the chalk dug from the caverns to whiten the Osmington White Horse.

Engine shed to be turned into visitors centre

Engine shed to be a visitors centre

The project, while having the backing of Dorset County Council, isn't welcomed by everyone.

The residents of Mappowder, where a pipe storage area will be based, are concerned about the large number of lorry movements driving through their village during construction.

Concern was also raised about the construction of the pipeline to be laid under Weymouth Bay in case it should obstruct some of the teams of sailors in training for the 2012 Olympics.

last updated: 21/04/2009 at 13:55
created: 08/02/2008

Have Your Say

What do you think of the plans for an 18km gas pipeline under the Dorset countryside and the gas storage caverns at Portland?

The BBC reserves the right to edit comments submitted.

Pat Bowdler
The need for gas means disconfort for some- especially during the construction of the pipe storage area. Usually the area of such a venture is changed permanently. I hope that this area will be restored to its pleasant atate.

Godfrey Broad
1. We should be putting more resources into solar water heating and solar electricity from photovoltaic cells rather than burning vast quantities of gas which producing carbon dioxide. 2. Some Dorset villages nearby do not have mains gas!

Steve L
Brillient timing, ready for the additional Olympic traffic.

Bill Woodhouse
Rachel Barton says, "Everything has been taken into account." As Chairman of Mappowder Village Meeting I have to dispute this. What so far has not been taken into account is the viable alternative route that Mappowder village has put forward to utilise the infrastructure laid down for the oil well rig a few years ago. This will allow the bulk of the heavy traffic to by-pass the tight bends and narrow village street, which is barely wide enough to accommodate present day milk tankers.We hope that at Friday 16th May's planning meeting the voice of the village will yet be heard and listened to. As a concept the Portland Storage and associated pipeline is brilliant and obviously in the national interest but a little more cooperation with local concerns would be welcome.

C. Holding
I live in the tiny rural village of Mappowder which gets no gas supply but where this important project connects into the main UK gas network. The project is clearly strategicaly important to UK infrastructure and well planned with great care for the environment. But since my village will suffer major disruption from heavy Construction Traffic through the narrow local lanes I feel strongly that we should be compensated by connection of gas to the village.

Russ O'Callaghan
This seems to be a develpoment that will leave very little scarring on the countryside that it involves. There would appear to be sound local and national reasons for its going ahead. it's all very well for people who want to pop down to Portland for one day in their lives and spend tuppence-three-farthings while they're down here, but that's not much of a valuable long-standing contribution to the local economy. Here's a chance to put Dorset on the national map.

Ashley Smith
weymouth is a real nice place lets try to make portland better not worse

martin cobb
this will be good for dorset

Gill McColl
Why on earth do they need to carve up the Dorset countryside to bring it down to Portland. Portland is a unique area so please leave it alone.

Steve, Portland
Portland has the greatest chance in it history to really get something good done for the island with the building of these gas storage chambers & pipeline.For one, councillors could insist on a decent road being built through the island to replace the totally useless one that is there at present.But it seems that the councillors are going to sell Portland short once again. All we Portlanders will be getting is a visitors centre and some other crummy projects involving goats. What use are they to us Portlanders?Come on councillors, get some backbone and do some good for Portland for once.

David Geary
Anything that brings work to this deprived area must be good. This may cause disruption to start but will be invisible after.

Deborah Perry
I think due to the disruption of this building work taking place over a number of years the community should be given more. Perhaps funding to local village that this work will pass through or to build a community leisure centre for the resident of Dorchester. A nice offer for the disruption but not enough.

Kel
Should provide some interesting opportunities for archaeological investigation, ahead of laying the pipeline.

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