Sydney-based company Enosi is working with technology giant Google and the University of New South Wales (UNSW) to advance energy accounting technology to certify 24/7 carbon-free energy.
The last years have seen much talk of companies committing to 100% renewable energy – which, while admirable, almost never means what it says.
While Google has been matching 100% of its operational electricity use with renewable purchases since 2017, the company only used ‘carbon free energy’ 66% of 2021 – meaning renewables actually powered its data centres two thirds of the time, while coal and other fossil generation was still consumed for the difference.
Following on from this discovery, Google set itself a new target of reaching 24/7 carbon-free energy by 2030 and is enlisting Australian companies and research institutes to help it get there.
It will be part of an EnergyTag demonstration led by UNSW’s Cooperative Research Centre, which looks to progress time-based renewable energy certificates.
As part of the trial, Enosi’s PowerTracer software will track clean energy from its source to Google’s Sydney operations and provide real-world case studies to the UNSW Research Centre for analysis.
Time matching renewables
The question of what constitutes green power use is being examined around the world with both the US and Europe moving towards 24/7 time matching – that is, ensuring renewable power is actually used at the time it was generated.
This logical definition is far from the benchmark applied in Australia, where green power use is recognised with certificates which don’t impose limits on either their time of use nor location.
“We’ve separated the characteristics of energy from the energy itself,” Enosi founder and CEO, Steve Hoy, previously told pv magazine Australia.
In 2021, President Biden signed an Executive Order committing the government to use “100 percent carbon pollution-free electricity by 2030, at least half of which will be locally supplied clean energy to meet 24/7 demand.” More broadly, the US is targeting a carbon pollution-free electricity sector by 2035.
Meanwhile, by 2027 the European Union is proposing hydrogen projects must match the electricity they consume with renewable generation on an hourly basis. In the UK, that time window drops to 30 minutes– meaning to be certified as green, electrolysers really can only run when the wind is blowing and the sun is shining.
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