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The cost of transporting gas through the Interconnector includes a capital
tariff element, a share of operating costs, a share of fuel costs and
certain additional costs (which arise only under certain operational
conditions and/or reflect a Shipper's specific communications requirements).
The capital tariff element and contribution to operating costs is paid
for at a set tariff (the same for each Shipper for the same category
of Primary Capacity) irrespective of use.
Fuel costs are 'charged' directly to Shippers using capacity. The 'cost'
of fuel at any given time is apportioned amongst Shippers pro-rata to
their transportation requirement at that time.
When the pipeline is in Forward Flow, each Shipper using either Forward
or Reverse Flow Capacity is required to contribute a share of fuel gas
used - principally by the gas turbines that power the IBT compressors.
Fuel gas consumption when the pipeline is in Forward Flow typically
amounts to 0.8% of the quantity of gas transported.
When the pipeline is in Reverse Flow, any use of Forward or Reverse
Flow Capacity results in a charge to cover the cost of electricity used
by the electric motors that power the IZT compressors. Electricity consumption
when the pipeline is in Reverse Flow is typically 0.2% of the quantity
of gas transported. In addition, a small amount of fuel gas, typically
around 0.06% of the quantity of gas transported, is consumed in the
gas heaters, and Shippers are required to provide their share.
IUK will always attempt to manage physical flow to optimise fuel efficiency
– and the fuel consumption rates quoted above will typically apply
across a fairly wide range of ‘normal’ operating conditions.
However, under certain operating conditions, particularly at very low
flow rates, it may be required to operate a compressor at an inefficient
point on its performance ‘map’ and fuel consumption rates
can vary quite widely under such circumstances.
In addition to the Tariff and the Fuel Costs, additional charges arise
in connection with the specific communications requirements of individual
Shippers and may also arise through the use of Interruptible Capacity
and/or through third party pressure service charges.
NOTE: There is currently no Interconnector
capacity available other than through the secondary market The price
of such capacity is as determined in that secondary market and therefore
no 'tariff calculator' is displayed on this website.
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