EnergyAustralia has acquired 7 MHz of Unwired's 2.3 GHz spectrum in NSW for use in its ongoing smart grid project.
The utility purchased the spectrum in Sydney, Newcastle and the Central Coast for $10 million.
EnergyAustralia's $170 million smart grid program began in 2006.
"The 7 MHz leaves Wireless Broadband Australia [formerly called Unwired] with 91 MHz, which is in line with its holdings in other markets and sufficient for the future needs of vividwireless," owners the Seven Network said in a statement.
Plans to transition Unwired customers over to the newer Vividwireless network were announced last month.
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