Construction is well underway on a new Windsor Substation on Sylvan Rd in Parkvale, Hastings, which Unison hopes will be an industry first.
Equipment on the current site was identified as reaching the end of its useful life, and the upgrade and replacement of the substation equipment required a new building.
The new substation will be a "first of its kind" in the country, and aims to be certified as a Living Building Challenge building, using net zero energy.
Work on the new standalone substation began in May this year. It is being installed in front of an existing building measuring 6m x 11m.