** AGL Energy AGL.AX slips as much as 11.6% to A$9.03; marks weakest trading session since February 2023
** Stock hits lowest since April 17, 2024
** Power producer forecasts FY26 underlying profit between A$500 mln ($326.4 mln) and A$700 mln
** Midpoint of profit estimate misses Visible Alpha consensus estimate of A$667.8 mln
** Co reports FY25 underlying earnings of A$640 mln, below Visible Alpha estimate of A$653.2 mln and last year's A$812 mln
** Cites higher operating and finance costs, lower margins due to intense competition
** YTD, AGL falls 19.7%
(Reporting by Rishav Chatterjee in Bengaluru)
((Rishav.Chatterjee@thomsonreuters.com;))