Vector says new longer life batteries can help meet peak demand and avoid costly network upgrades.
The electricity network company is bringing in Tesla's lithium-ion batteries for home and commercial use from November.
Vector chief executive Simon Mackenzie said that is a game changer for the energy industry.
He said Vector could use the batteries as a cost-effective way to meet demand, while households could use them in conjunction with Vector's solar products to store energy.
Simon Mackenzie said the domestic battery packs cost about $US3500 each and the interest had been greater than expected.