Investor Presentaiton
Spa*ark Energy_9
LEMONT IS DIFFERENT
To date, Australian geothermal targets have been mainly petrothermal plays; i.e., hot rocks with low permeability. Some
good temperatures were obtained, but the difficulties in achieving viable flow rates were under-estimated: see figure.
Lemont started as a conceptual play centred on the Tamar Fracture Zone, where high permeabilities and high.
temperatures were anticipated. A good target was defined (see supplementary DATA slides), but for many of the reasons
described by Geoscience Australia*, insufficient funds were available to drill it.
Recent independent financial modelling by Rockwater Pty Ltd# suggests a likely net output of circa 6.5MW per well, after
parasitic and pumping loads (or ~9MW if incorporating a hybrid heating scheme such as described in the previous slide).
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*
http://www.ga.gov.au/ausgeonews/ausgeonews 201306/geothermal.jsp
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# Preliminary Business Case for Electricity Generation from SPA*ARK
Energy's Lemont Geothermal Prospect in Tasmania (Rockwater, 2018).
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Resource Temperature
Range of previous Australian
projects
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Rockwater
modelling
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30 M
28 MW
26 MW
24 MW
22 MW
20 MW
18 MW
16 MW
44 MW
12 MW
10 MW
Target zone for
Lemont
8MW per well
IIIII&MW-
6MW per well
4 MW
Power plant output, expressed here in MW per well, is a function of
reservoir temperature and flow rate. Previous plays in Australia
failed to achieve a viable flow rate (grey shaded area). Lemont is
more akin to a conventional (albeit non-volcanic) hydrothermal play
and much higher flow rates are anticipated (green shaded area).
The 6MW dashed line illustrates the ~12% extra energy which
would be required if Lemont was located in Central Australia.
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T
140
80 degree
rejection
temperature
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11 degree
120
ambient
temperature
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(C. Huddlestone-Holmes, pers comm.)
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40
2MW
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80
100
120
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Flow Rate (kg/s)View entire presentation