Like what you've read?

On Line Opinion is the only Australian site where you get all sides of the story. We don't
charge, but we need your support. Here’s how you can help.

  • Advertise

    We have a monthly audience of 70,000 and advertising packages from $200 a month.

  • Volunteer

    We always need commissioning editors and sub-editors.

  • Contribute

    Got something to say? Submit an essay.


 The National Forum   Donate   Your Account   On Line Opinion   Forum   Blogs   Polling   About   
On Line Opinion logo ON LINE OPINION - Australia's e-journal of social and political debate

Subscribe!
Subscribe





On Line Opinion is a not-for-profit publication and relies on the generosity of its sponsors, editors and contributors. If you would like to help, contact us.
___________

Syndicate
RSS/XML


RSS 2.0

South Australia - a renewable state?

By Paul Miskelly and Tom Quirk - posted Thursday, 16 March 2017


Figure 3:Storage of surplus wind farm energy to match demand

The challenge is to identify storage technology for some 300 GWh of supply. The base case is to calculate the amount and cost of lead acid batteries to satisfy this need.

A very thorough summary of storage technologies is to be found in Sustainable Energy. Figure 4 is a summary of the storage technology power and energy density capabilities. The range of batteries extends from lead acid to lithium-ion and beyond. For this analysis the energy densities are the mid range values for lead acid and lithium-ion.

Advertisement

On the bottom far right of the figure, the hydrocarbons (fossil fuels) show energy densities of a factor of ten greater than the batteries considered here.

Figure 4:Scatter plot of power and energy density for storage technologies from page 400 of Sustainable Energy, Second Edition2012 by J W Tester, E M Drake, M J Driscoll, M W Golay and W A Peters MIT Press.

So for the lead acid batteries adopting a value of 40 Wh/kg for 300 GWh of storage requires 7,500,000 tonnes of lead acid batteries. For higher energy density lithium-ion batteries have an energy density of 140 Wh/kg so only 2,100,000 tonnes would be needed.

But this could be realized at what cost? Estimates of lead acid battery costs are around $0.20 per Wh while lithium-ion batteries vary from $0.50 to $0.90 per Wh. The Power Wall 2 lithium-ion battery from Tesla is A$8,000 for 14 kWh but this is a retail price of $0.57 per Wh. The wholesale bulk price could be as low as $0.30 per Wh with better performance than the lead acid battery in discharge rate and lifetime.

Willem Post has a detailed article on energy storage in Germany. His base case is lead acid batteries with massive, bulkenergy storage. The cost per Wh is $0.32.

Advertisement

So the battery storage is some $60 to $90 billion to store the surplus energy from 4,000 MW of new wind farms with substantial running costs due to battery lifetime and erratic discharges.


This analysis outlines the storage required to address wind's inherent intermittency. It does not address the requirements, presently unaddressed by wind energy technology, of grid stability and control, which is the need for the provision of synchronous inertia to protect grid stability. Should the battery route be chosen to address this requirement, such provision may indeed require more battery storage.

Of course South Australia could close all the gas fueled power stations and build massive interconnectors to the other states and then blame them for CO2 emissions. Perhaps that is why the South Australian government talks of nationalizing the power stations.

  1. Pages:
  2. 1
  3. Page 2
  4. All


Discuss in our Forums

See what other readers are saying about this article!

Click here to read & post comments.

29 posts so far.

Share this:
reddit this reddit thisbookmark with del.icio.us Del.icio.usdigg thisseed newsvineSeed NewsvineStumbleUpon StumbleUponsubmit to propellerkwoff it

About the Authors

Paul Miskelly is an electrical engineer who worked for ANSTO for 32 years.

Tom Quirk is a director of Sementis Limited a privately owned biotechnology company. He has been Chairman of the Victorian Rail Track Corporation, Deputy Chairman of Victorian Energy Networks and Peptech Limited as well as a director of Biota Holdings Limited He worked in CRA Ltd setting up new businesses and also for James D. Wolfensohn in a New York based venture capital fund. He spent 15 years as an experimental research physicist, university lecturer and Oxford don.

Other articles by these Authors

All articles by Paul Miskelly
All articles by Tom Quirk

Creative Commons LicenseThis work is licensed under a Creative Commons License.

Article Tools
Comment 29 comments
Print Printable version
Subscribe Subscribe
Email Email a friend
Advertisement

About Us Search Discuss Feedback Legals Privacy