Kaitiakitanga and climate positive energy

Here you can learn more about how we're climate positive, our management of natural resources, and our wonderful partnerships.

What's Kaitiakitanga? It means guardianship and protection - something that is woven into the fabric of Mercury.
Partnerships Sustainability

climate positive energy

Through our efforts we've been climate positive since 2017. How are we doing that? We're proudly supporting activities which ensure carbon dioxide is removed from the atmosphere and stored in a natural form (e.g. carbon stored in a tree). The official term for this is carbon sequestration.

Moving away from thermal generation helped us decrease our total emissions by 36% since 2015.

We love New Zealand and take climate change measures seriously. We're actively measuring and monitoring our carbon emissions, and we've been investing in a wonderful forestry programme since 2010. 


36% DECREASE in emissions since 2015  

more details gas emissions report

Managing climate change

For the last 2 years, we've submitted information to the CDP (formerly the Carbon Disclosure Project). The CDP runs the global disclosure system that enables organisations and government to measure and manage their environmental impacts.

With the 2018 result in, we're pleased to have made it into the top 10 list of New Zealand companies (and the only energy company) that made a submission. This result means that the CDP has acknowledged our current efforts towards management of climate change. There's always more to do, and their response will help us to continue the good work.

our submission More about sustainability

Managing natural resources

There are a number of programmes and surveys that we undertake (or participate in) to ensure we're caring for natural resources. Here are some great examples.


Environmental audits

16 audits were carried out at our operating sites during FY19.

River bed surveys

We conduct 5-yearly bed degredation surveys to understand the potential impacts of sediment retention in the dams along the river from Karapiro to Ngaruawahia.

Foreshore survey

The annual Lake Taupo foreshore survey helps us and others understand how lake processes might be affecting the lake.

Erosion surveys

The 5 yearly erosion survey provides insight on potential impacts of our hydro operations on bank stability along the river.

Ecological monitoring

We've kicked off an ecological monitoring programme to ensure we understand any impacts downstream from Karapiro, beyond our hydro system.


35 years is the term of our most recent Waikato River resouce consent granted in 2006.

renewable generation

renewable generation

The energy we generate is 100% renewable - hydro, geothermal and solar. We think that's pretty wonderful.
renewable sources


We work with iwi in a number of ways, which include commercial partnerships and community programmes.
Iwi partnership


Working with other great people and organisations is an essential part of who we are, and what makes us successful.