Whole life costings for rising mains Peel STW
Authority [[manx-utilities-authority
Date received 2017-08-14
Outcome Some information sent but not all held
Outcome date 2017-08-31
Topic [[utilities-infrastructure

Summary

The request sought whole life costings for rising mains to three proposed Peel sewage treatment works sites. Manx Utilities disclosed costs for two viable options but withheld information for the third site as it was not held, citing commercial and economic interest exemptions for the remaining sensitive data.

Key Facts

  • Operational costs for the pipelines are considered insignificant, so whole life costs consist primarily of capital costs.
  • The Glenfaba Road site (Option b) was discounted as not-deliverable, so no cost information is held for it.
  • Cost data for the Peel Power Station site (Option a) and Knockaloe Farm site (Option c) was released.
  • The authority applied a public interest test and concluded that the risk of harm to tendering processes outweighed the benefit of disclosure.
  • The disclosed figures represent total lifetime discounted Net Present Value (NPV) over 25 years at a 3.5% discount rate.

Data Disclosed

  • 12 August 2017
  • 14 August 2017
  • 31 August 2017
  • IM98957I
  • 3.5%
  • 25 years
  • £1,689,962
  • £3,542,496

Exemptions Cited

  • Section 30(2)(b) of the Freedom of Information Act 2015 (Commercial interests)
  • Section 30(1)(a) of the Freedom of Information Act 2015 (Economic interests of the island)
  • Section 11(3)(a) of the Freedom of Information Act 2015 (Information not held)