** U.S.-based Solar panel maker First Solar's FSLR.O shares advance 1.3% to $236.65 premarket
** Co beat expectations for Q3 sales on Thursday, riding strong demand
** Co to build 3.7 GW U.S. factory, with production starting end-2026, ramping up through H1 2027
** FSLR posts Q3 net sales of $1.6 billion vs estimate of $1.56 billion - data compiled by LSEG
** Narrowed its 2025 sales forecast to between $4.95 billion and $5.2 billion from prior view of between $4.9 billion and $5.7 billion
** "Q3 was challenged by contract terminations and a supply chain issue" contributing to the lower 2025 guidance - analysts at RBC Capital Markets
** Brokerage adds, FSLR is seeing pricing strength which could be more impactful to longer-term outlook
** As of last close, FSLR up 32.5% YTD
(Reporting by Sumit Saha in Bengaluru)
((Sumit.Saha@thomsonreuters.com;))