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DECOMMISSIONING INSIGHT
2015
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7.2.3 Average Cost per Tonne Forecasts for Making Safe
The average cost per tonne forecast for ‘making safe’ of facilities is £440 in the CNS and NNS/WofS regions and
£990 in the SNS and Irish Sea. The range of cost per tonne forecasts is broad in all regions, but especially in the
SNS and Irish Sea. The scope of work associated with ‘making safe’ will be similar across different platform types.
Activity will take longer on larger structures, but the fixed costs will be similar, increasing the cost per tonne
forecasts for the smaller, lighter structures commonly found in the SNS and Irish Sea. The NUIs will also require
transport by helicopter or an accommodation vessel for a team to carry out ‘making safe’ activities, adding further
cost. Many of the installations in the SNS are smaller NUIs, contributing to the higher average cost forecasts and
larger range. Expenditure at the lower end of the range is in line with those seen in the CNS and NNS/WofS areas
and is likely to be associated with larger, manned platforms.
Figure 16: Variation in the ‘Making Safe’ Cost per Tonne Forecasts for Topsides Split by Region
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
2,000
CNS and NNS/WofS
SNS and Irish Sea
Estimated Cost per Tonne (£ Million - 2015 Money)
Source: Oil & Gas UK
Central and Northern North
Sea/West of Shetland
Southern North Sea and
Irish Sea
Average cost per tonne
£440
£990