Press Release – University of Waikato A plan by two of New Zealands largest electricity generators to create the worlds largest green hydrogen plant in Southland is fundamentally flawed, says one of New Zealands foremost experts in hydro schemes and electricity generation. Meridian … A plan by two of New Zealand’s largest electricity generators to create the world’s largest green hydrogen plant in Southland is fundamentally flawed, says one of New Zealand’s foremost experts in hydro schemes and electricity generation. Meridian and Contact Energy released a report by global consultants McKinsey & Co on Thursday, as they seek interest for what could be the world’s largest hydrogen plant in Southland. Their supply agreement with Aluminium Smelters for Tiwai Point comes to an end in late 2024.