Meridian Energy has appointed Switzerland-based consulting firm ABB as its telecommunications and telemetry provider.
ABB will manage services provided to Meridian by carriers and vendors, Meridian spokesman Alan Seay says.
Seay says the deal, which he describes as "multi-million dollar", is for a three-year term.
"We have a range of providers, such as Vodafone for mobile service and ABB will act as the interface for all of them."
Seay says the deals is "fairly groundbreaking" for Meridian, which previously had separate agreements with the different providers.
"ABB has to deliver the outcome for us; it will manage the interface with all providers and make sure the outcome is that we get the best services we can."
The contract is a departure for Meridian in terms of telecommunications, but many other parts of its business are already outsourced, Seay says.
"We're heavily outsourced. All non-core activities that are best carried out by other people are carried out by other people."
The South Island power generator has 280 fulltime staff, "and $2.6 billion worth of assets".
Meridian issued a request for information for telecommunications services in April and received proposals from "a large number of market participants", including telcos themselves, Seay says.