Cost of capital 2017

The cost of capital is the financial return investors require from an investment given its risk.

The input methodologies require the Commission to publish estimates of the cost of capital at regular intervals for each type of service. Estimates of the cost of capital for information disclosure purposes are determined annually. Estimates of the cost of capital for price-quality regulation are used in setting prices so they are determined before each new regulatory period.

On this page you can find the determinations of the cost of capital made in accordance with the input methodologies determinations.

Previous cost of capital determinations can be found in the IMs archive.

Project timeline

Type Description Indicative date/s
Completed WACC for DPP for GPBs 31/03/2017
Completed WACC for ID for EDBs and Airports with March year-end (EDBs and WIAL) 28/04/2017
Completed WACC for ID for GPBs and Airports with June year-end and Transpower (First Gas, GasNet, AIAL, CIAL and Transpower) 31/07/2017
Completed WACC for ID for GDBs (Powerco) with September year-end 31/10/2017


These dates are not official and may change. Please see the Terms and Conditions for further limitations.


Cost of capital determinations – 31 July 2017

02/08/2017 (1 documents)

[2017] NZCC 19 Cost of capital determination – Transpower, GPBs and Airports ID – 31 July 2017 PDF (547 KB)
Published on 02 August 2017