More links and websites
More suggestions and sources
Martin, John E., ed. People, politics and power stations: electric power generation in New Zealand, 1880–1990. 3rd ed. Wellington: Electricity corporation of New Zealand and Historical Branch, Dept. of Internal Affairs, 1998.
Rennie, Neil. Power to the people: 100 years of public electricity supply in New Zealand. Wellington: Electricity Supply Association of New Zealand, 1989.