Dec 21 (Reuters) - Origin Energy Ltd ORG.AX
* origin and enn sign lng sale and purchase agreement-org.ax
* had signed lng sale and purchase agreement with ENN LNG Trading Company for delivery of liquefied natural gas to china
* Under SPA, origin will supply 280,000 tonnes of LNG per year for a period of five years
* Says parties have ability to extend supply period by an additional five years
* origin and enn sign lng sale and purchase agreement-org.ax Source text for Eikon: ID:nASX7SB0bp Further company coverage: ORG.AX