National leader Bill English's campaign pitch to a group of staff at Vodafone was interrupted by a solitary heckler demanding to know what he was doing for poverty and the environment.
After English finished speaking the man was quickly ushered out before media could get to him.
English has said a fourth term National Government would be committed to doing more for the environment now the books were in robust shape.
Speaking to Vodafone staff in Mt Eden, English said National was now in a position to use the surplus to "spread the benefits across the community".
That included the environment and child poverty.