ORIGIN ENERGY LIMITED — Capital/Financing Update 2017

Mar 19, 2017

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20 March 2017

The Manager Companies ASX Limited 20 Bridge Street SYDNEY NSW 2000

(3 pages by email)

Dear Madam

SILVER STAR-1 EXPLORATION WELL UPDATE 1

The Directors of Planet Gas Limited ('Planet Gas') are pleased to provide an update of drilling of exploration well ‘Silver Star-1’ within PEL 638 in the South Australian Cooper Basin.

SILVER STAR-1 EXPLORATION WELL

Spud Date: 17 March 2017 Planned Total Depth: 3,600 metres

Current Depth: 175.5 metres as at 2400hrs on 19/03

Operations: Drill 17½" surface hole section to ± 1150m. Participating Interest: Senex Energy Limited (Operator) 53.75% Origin Energy Limited, 33.75% Planet Gas 12.5% (free carried)

Drill 17½" surface hole section to ± 1150m.

About Silver Star-1 exploration well

The Silver Star-1 well is a high impact exploration well and will target basin centred gas and stratigraphic gas in the Permian sandstones, and is expected to be drilled to a depth of approximately 3,600 metres.

Planet Gas Limited[ABN][ 46 098 952 035]

Level 2, 66 Hunter Street Sydney NSW 2000 Australia T +61 2 9300 3322 F +61 2 9221 6333

W www.planetgas.com

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Depending on the properties of the reservoir successfully meeting certain criteria, a lateral section of up to 1,500 metres will then be drilled. Multi-stage fracture stimulation and testing of the well is expected to follow.

The gross drill cost estimate is approximately $15 million with Planet Gas’ 12.5% interest free carried by joint venture partners Senex Energy Limited and Origin Energy Limited.

For further information, contact Peter Nightingale on +61 2 9300 3322.

Yours sincerely

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Peter J. Nightingale Director

pjn8826

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Figure 1: Location of Silver Star-1 Exploration Well

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