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The Coober Pedy “hybrid” renewables plant

The Coober Pedy “hybrid” renewables plant

The Coober Pedy hybrid wind-solar-diesel plant, a clone of the King Island plant discussed in this recent post, achieved 68% renewables generation in its first year of operation and is expected to achieve around 70% for the rest of its operating life. According to Energy Developments (EnGen), the plant’s owner, this “demonstrates the credibility and reliability of renewable hybrid energy systems for off-grid communities and mine sites”. This is questionable. The $38.9 million* Coober Pedy plant is heavily subsidized, saves a negligible fraction of Australia’s CO2 emissions (at an unsubsidized cost of hundreds of dollars/ton CO2), will not lower electricity bills and requires that the existing diesel units be left in place as backup. One has to question whether Coober Pedy and other similar “hybrid” plants currently under development in Australia are worth the expense. (Inset: Coober Pedy golf club).

*All monetary values in this post are in Australian dollars. Conversion factors relative to the 2016-2017 construction period are 0.75 for US dollars and 0.62 for Euros.

Background:

Coober Pedy, 2016 population 1,762, is an “electricity island” with no grid connections to the rest of Australia. Its ~12 GWh/year electricity consumption (peak load is around 3 MW) has historically been filled by eight diesel units owned and operated by EnGen and aggregating 3.9MW. Figure 1 is a location map and Figure 2 an aerial view of the town, which is renowned as the world capital of opal mining:

Figure 1: Coober Pedy location map

Figure 2: Aerial view of town

In 2013 Engen began to explore the possibility of replacing Coober Pedy’s diesel generation with renewables:

In 2013, EnGen began investigating the potential to integrate renewable energy into the existing power station to reduce diesel consumption in Coober Pedy. EnGen submitted an Expression of Interest to the Australian Renewable Energy Agency’s (“ARENA”) Regional Australia’s Renewables Industry Program (IRAR) in November 2013 which ultimately led to the execution of a Funding Agreement with ARENA in July 2014. Construction of the CPRHP commenced in September 2016 and commercial operations commenced on 1 July 2017.

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