The complex world of crypto mining could be about to come to Central Otago. Reporter Jared Morgan speaks to a Dunedin software engineer concerned about a lack of transparency over plans for a ‘‘data centre’’ in the region.

Late last month Contact Energy announced plans for a data centre to be constructed in the shadow of one of its prime assets, the Clyde Dam.

One word missing from the announcement was ‘‘cryptocurrency’’.

Yet cryptocurrency mining installations are a common addition to power stations worldwide.


Because they are power-hungry.

Dunedin software engineer Oscar McNoe said Contact needed to be more upfront about the proposed data centre planned near the foot of the dam.

Mr McNoe said he believed the plans centred on online blockchain/cryptocurrency mining — a form of online transactions.

He believed the energy company needed to be transparent.

‘‘At least they should be upfront that it is just a crypto mining system and that it will likely raise power prices for all New Zealand.’’

On August 31 Contact announced it, and its 100%-owned energy solutions business Simply Energy, would supply renewable electricity for a data centre being developed near the dam by UK-based digital infrastructure company Lake Parime.

The agreement signed with Lake Parime was for Contact to supply 10MW of renewable electricity to operate the planned low-emissions data centre.

That roughly equates to the power used by 10,000 homes.

Mr McNoe said according to Lake Parime, it supported customers with ‘‘machine learning, blockchain, visualisation, modelling and artificial intelligence’’.

Information online about Lake Parime’s business and hardware suggested it was heavily, if not solely, dedicated to blockchain/cryptocurrency mining, he said.

‘‘They [Lake Parime] are not using their hardware for anything else.

‘‘They are not doing intensive hardware and software development — they are buying hardware and software from maybe China and installing it somewhere where it can be used to make money.’’

It was important to note the hardware/software would be cryptocurrency specific, not general purpose, Mr McNoe said.

Links to Lake Parime checked by the Otago Daily Times appear to back up its links to cryptocurrency.

The London-based company’s chief executive Sath Ganesarajah previously worked as a consultant for a company called Digital Capital Research which specialises in cryptocurrency.

Mr Ganesarajah’s blog was focused exclusively to the currency and a job listing for Lake Parime said an interest in ‘‘blockchain, cryptocurrency (Bitcoin and Ethereum) and other high-performance computing applications would be advantageous’’.

There was no suggestion of any other uses for a data centre and Mr McNoe said he could not see any other use for it than to mine cryptocurrency.

‘‘Part of the problem is it’s not going to be something that in any way contributes to the economy and it just ultimately shouldn’t be appropriate.’’

He said potentially cryptocurrency mining could be a good use of electricity resources but it seemed more likely to raise electricity costs for everyday households.

‘‘It’s not a real data centre, providing jobs and opportunities for local businesses — it’s just several massive cryptocurrency mining boxes, that will just increase electricity demand and prices.’’

Contact generates electricity and sells it on the New Zealand market but by putting the data centre in place he believed the company would then be competing with consumers, he said.

Latest data suggests cryptocurrency mining consumes 0.5% of all electricity used globally, some seven times that used by Google across its global operations.

Analysis by Cambridge University suggests Bitcoin and altcoins use more electricity annually than Finland, Belgium, Austria, and Switzerland.

The latest available data via the university’s Cambridge Bitcoin Electricity Consumption Index ( states if cryptocurrency were a country, it would rank 34th in the world in energy use, consuming 98.2 terawatt-hours (TWh) of electricity per year.

By comparison New Zealand ranks 59th in the world, using 41.1TWh.

The university tracks usage on a 24-hour cycle via the index.


  • Cryptocurrency uses cryptographic signatures to verify all transaction records.
  • Those transactions are recorded on a blockchain and are created using the same ways as cryptography (the science of hiding information).
  • Digital signatures can be used to keep the transactions safe, and allow other people check transactions are real.
  • The first cryptocurrencies were made to be free of government- given currencies.
  • Cryptocurrencies use ‘‘decentralised control’’, meaning they are not controlled by one person or government — differing from ‘‘centralised’’ electronic money and central banks.
  • The control of each cryptocurrency works through a distributed ledger (a list of transactions shared by everyone), usually a blockchain, that serves as a public financial transaction database.
  • Bitcoin, first released as open- source software in 2009, is often called the first decentralised cryptocurrency.
  • Since then, more than 4000 cryptocurrencies (sometimes called ‘‘altcoins’’ — short for alternative coins) have been created.
  • ‘‘Mining’’ for the cryptocurrencies is power-hungry, involving heavy computer calculations to verify transactions.

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