Feb 18 (Reuters) - Origin Energy Ltd ORG.AX :
* Origin reports half year results ORG.AX
* Says Origin has initiated cash preservation measures to reduce net debt to below $9 billion in FY 2017
* Reaffirms that it sees FY 2016 underlying EBITDA (excluding lng underlying EBITDA) to be $1.45 billion - $1.55 billion
* Reaffirms FY 2017 underlying EBITDA (excluding lng underlying EBITDA) to be $1.90 billion - $2.10 billion
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