A woman has been transferred to Christchurch Hospital after a car struck a power pole on State Highway 3 in Kaitoke, near Whanganui.
The crash occurred about 12.30pm on Thursday and caused the highway to be closed, with two people taken to Whanganui Hospital in serious condition.
Te Whatu Ora Whanganui said one patient, a woman, was treated and then transferred to Christchurch Hospital while the second patient, a man, was treated and discharged.
A Powerco representative said the incident involved a car hitting a power pole on the highway, resulting in power being cut to 224 customers and bringing powerlines down.
A field crew was dispatched to make the site safe and assess the damage.