Flex solutions – Otumoetai substation security of supply

Overview

We invite expressions of interest (EOI) to provide flex solutions for Otumoetai substation, Tauranga.

The challenge

The Otumoetai substation is supplied by a 33kV grid exit point (GXP) connection from Transpower’s Tauranga substation. Our Otumoetai substation has two transformers – one is rated 10/12MVA and the other 12/15MVA. Demand on the substation is currently peaking at 15MVA, with further growth from infill developments expected to put more pressure on it.

While we’re planning to use the transformers’ variable equipment ratings and temperature monitoring to avoid us needing to replace the transformers immediately, we’re also seeking flex solutions that can assist with supply when extra capacity is needed. 

The opportunity

We invite expressions of interest to provide on-call flex solutions during peak demand times on Otumoetai substation.

What we offer

We’ll provide a retainer for having the flex solution available to us, with additional remuneration each time it is used. 

Our requirements 

Minimum load reduction

A minimum 500kVA load reduction is required to ensure a flex solution is of sufficient scale to be of use.

The total load reduction amount can be established over a period of time, but your solution would need to be in place by December 2027. 

Duration

The times required are set out in the table below. However, we would also consider shorter periods, where these periods align with the middle of the desired load reduction times, with a minimum of two hours duration required.

Demand reduction periods

Load reduction would need to be available at the following times: