Mercury NZ Ltd. engages in the generation and distribution of electricity from hydro, geothermal, and gas. It operates through the Energy Markets and Other segments. The Energy Markets segment involves in the electricity production, electricity trading, sale of energy and related services and products to customers, and generation development activities. The Other segment includes metering, sales of solar equipment, and international geothermal operations. The company was founded on December 16, 1998 and is headquartered in Auckland, New Zealand.