The gas processing plant at Nyhamna in Romsdalen has for several years been plagued by power outages. The subsequent stoppage in gas exports to England, according to operator Shell led to losses resulting from ù whole NOK 659 million.
In a concept study to the MPE recommends Statnett now a solution with incremental development because they believe the fastest possible will increase the supply reliability to the gas processing plant at Nyhamna in Romsdal.
The power supply to the Nyhamna plant is currently unilaterally supplied through a 420 kV line from Viklandet, but with the possibility of some reserve supply through 132 kV network.
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Step Development
It has previously been proposed to build a new 420 kV line in one go, to make two-sided supply, so-called N-1. But this solution ready discards now Statnett.
– We recommend to strengthen supply reliability in power supply with a concept where we decide and implement measures incrementally. The most important thing as we see it now is to have a plan as quickly as improve supply reliability to Nyhamna while through project development prepares us to meet the future needs, says Executive Vice President Borgen in a press release.
During 2016-2018 the expansion of the gas processing volume at Nyhamna cause both output and energy requirements of the plant increases.
The consequences of disruptions in the power supply will increase because the plant after the expansion is not longer make use of current reserve supply from the 132 kV network, while more gas is affected by stoppage in gas processing. This applies according to Statnett particularly at fault events with long repair times.
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Finished in 2024
The first step in Statnett’s plans is the construction of the new substation Isfjorden. This will reduce the consequences of protracted fault in the central grid in that it provides increased capacity to reserve supply from the 132-kV network.
At the same time, Statnett shall notify the authorities to build a new 420 kV line between Isfjorden and Fræna. The construction of this will be the next step. If gas operators doubles current industry radial between Fræna and Nyhamna, it becomes a full-fledged N-1 solution to Nyhamna, according to Statnett.
According to Statnett can Isfjorden station scheduled for completion in 2020, while Ørskog- Nyhamna- connection can be completed around 2023. The full N-1 connection from Isfjorden to Nyhamna can then be completed in 2024, according to Statnett.
A technical and economic analysis of possible N-1 solutions for Nyhamna was in 2014 prepared by Statnett in consultation with Shell and Gassco. It is on the basis of this analysis Statnett now completed conceptual study.
Statnett’s proposal is estimated to cost 1.75 billion.
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Photo: Statnett
Photo: Statnett
Animal shutdown
There may be a lot of money to save on better power supply at Nyhamna. According Statnett it is expected that there will be approximately 0.65 outcomes of 420 kV supply per year.
80 to 85 per cent of outcomes is expected to last less than an hour, but because of the startup time entails this almost one day deferred gas production.
Given the maximum production and a gas price of NOK 2 per Sm3 are the direct costs approximately 60,000,000 to 75,000,000 kroner per day, according to Statnett. Costs are related to loss of value due to deferred production, buyback costs to maintain delivery commitments and damage to equipment at the processing facility at Nyhamna.
15 to 20 per cent of outcomes is expected to last two days or more. The reserve supply in today’s 132 kV network could cause a halt in gas exports. The direct costs of the most common causes of such outcomes is approximately three days exposed gas production 180-225000000 million.
At worst, it can take several weeks to repair the errors so that the costs are substantial higher.
“Even with low probability, constitute such incidents about 25 percent of total expected interruption costs, and they will be very serious if they do occur,” writes Statnett.
Such stoppage will also weaken Norway’s reputation as a gas supplier.
According to a note from Gassco attached Statnett Progress will present value loss due to delayed production reduced by 1.5 billion if the mains being improved from 2020 compared to if nothing is done.
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Reserve power plant can help
Today Statnett has been granted an exemption to use the reserve power plant at Nyhamna as a reserve supply for the gas processing plant at fault in 420 kV connection.
But permission from the authorities to the disputed power plant expires when the new 420 line between Ørskog Sogndal being completed, and Statnett therefore planning to sell it.
The company stresses, however, that the reserve power plant reduces the risk of the most extensive consequences of fixed errors and serious errors events that mast problems, until Isfjorden substation is realized.
“The consequences for the value of Norwegian gas at possible prolonged halt in gas exports is not considered, but may improve the profitability of having reserve power plant at Nyhamna,” writes Statnett.
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