** Shares of Australia's Sparc Technologies SPN.AX rises as much as 9.7% to A$0.17, their highest since October 13

** Stock gains 6.5% so far this week, on track for its biggest weekly climb since early October

** Co says its green hydrogen pilot plant in Roseworthy, South Australia achieves sustained hydrogen generation under concentrated solar conditions

** Green tech firm adds the milestone marks completion of commissioning and transition to operational testing

** SPN up 3.1% YTD

(Reporting by Keshav Singh Chundawat in Bengaluru)

((Keshav.singhchundawat@thomsonreuters.com))