Marlborough Lines Limited (Marlborough Lines) is an electricity distribution company, based in Blenheim, New Zealand.Marlborough Lines is responsible for subtransmission and distribution of electricity to approximately 25,400 customers in the Marlborough Region over a service area of 11,330 km2 (4,370 sq mi). The network includes approximately 3,400 km (2,100 mi) of power lines extending to some very isolated areas across the region, including the extremities of the Marlborough Sounds, which can only be reached by boat or helicopter.