** Shares of power producer AGL Energy AGL.AX advances as much as 8.25% to A$9.580, posting their biggest intraday pct gain since early February 2024
** Hits its highest since December 4, 2025
** Co sees FY underlying net profit after tax to be between A$580 million and A$680 million ($410.23 million and $480.96 million), above Visible Alpha consensus estimate's midpoint of A$589.5 million
** HY underlying profit came in at A$353 million, below last year's A$377 million yet beating the A$307.4 million Visible Alpha estimate
** Says forecast reflects stronger HY consumer margins alongside lower-than-expected operating costs and depreciation
** Over 2.6 mln shares change hands, 1.3x 30-day avg
** Stock up 1.3% YTD
(Reporting by Kumar Tanishk in Bengaluru)
((Tanishk.Kumar@thomsonreuters.com; X: @thatstanishk http://www.x.com/thatstanishk))