** AGL Energy AGL.AX down as much as 3.3% to A$10.460; biggest intraday pct loss since Oct. 31

** Energy provider fined A$25 mln ($15.6 mln) by Federal Court for delay in Centrepay refunds to ~500 customers

** Centrepay, a program by Services Australia, enables welfare recipients to handle essential bills through direct deductions from their payments

** Stock hits lowest since Nov. 14

** AGL up 10.5% YTD

($1 = A$1.6069)

(Reporting by Kumar Tanishk in Bengaluru)

((Tanishk.Kumar@thomsonreuters.com;))