Rotohiko 35mw BESS

The Rotohiko BESS has the capacity to store 35 MW of electricity, enough to meet the demand of more than 2,000 homes. The BESS will enhance grid stability and resilience and allow for more renewable energy generation to be connected to the grid.

The BESS was developed by WEL Networks and Infratec. The major equipment supply contractors were Saft for the batteries and Power Electronics for the inverters.

McKay was engaged by Saft to be their local partner for the testing and commissioning scope. McKay provided 2 engineers over a period of 3 months to perform the site-based activities on behalf of the remote Saft technical support team. The engineers were also supported by McKay electricians from the Hamilton branch for the switching and module replacement activities which required NZ registered electricians to perform.

The McKay team were responsible for their own permits and work areas while working on the site, including ensuring all parties were wearing correct PPE for each activity (sometimes up to CAT4 PPE). The main scope was delivered safely in October 2023 although final BESS balancing is ongoing into 2024.

Value Added:

Flexibility to commission the site during challenging weather conditions.
Experience working with stored energy and DC systems safely.
In-house electrical contracting capability allowing for electrician/s to be mobilised where required for cell replacement etc.
Local presence allowing for on the ground commissioning to occur with technical support offshore.
Coordination between Infratec and Saft to facilitate a seamless commissioning process.