Taranaki-based First Gas successfully challenged Commerce Commission’s 2023 regulatory changes which would have had the effect of reducing prices for customers served by its 7500 kilometre network.
There was insufficient evidence to support departure from previous practice of setting gas utilities weighted average cost of capital at the same level as that for electricity utilities, the High Court ruled.
Gas and electricity utilities are natural monopolies. It is unlikely that any competitor will seek to duplicate their distribution network. Monopoly profits can be extracted with excessive pricing.
Commerce Commission seeks to limit monopoly profits, primarily by determining the ‘true’ cost of capital a particular utility would face if it were operating in a competitive market; a calculation requiring some speculative assumptions. This calculation feeds into prices charged consumers.
The Commission’s balancing act is that the weighted average cost of capital needs to be high enough to ensure utilities recoup the cost of their investment, but not so high as to generate excessive profits.
As part of its regular review of utility pricing, Commerce Commission decided in 2023 to differentiate between gas utilities and electricity utilities, favouring electricity utilities on the basis they require greater capital investment: failure of electricity supply is more common than failure of gas supply, with the economic effect of any failure in the electricity network being more catastrophic, the Commission decided.
A higher weighted average cost of capital is justified for electricity networks so as to reduce the possibility of under-investment in network assets, the Commission said.
Gas networks were no longer considered ‘similar enough’ to electricity networks for the two to be treated the same.
The only major gas network disruption was in 2011, when a landslide cut a gas pipeline in Taranaki; an network outage not caused by any lack of investment.
On appeal by First Gas, the High Court ruled the Commission did not provide compelling new evidence or analysis as to why gas networks should now be treated differently.
Forcing a change to gas network’s weighted average cost of capital without adequate evidence would undermine confidence in the current regulatory framework, creating uncertainty for businesses and prejudicing future investment decisions, the High Court ruled.
First Gas Ltd v. Commerce Commission – High Court (7.05.26)
26.153