Six firefighting crews are at a barn fire in Hundred House, near Llandrindod Wells.
Crews from Builth Wells, Rhayader, Brecon, Knighton and Hereford & Worcester are all in attendance.
Six pumps and two water bowsers are in use.
A Powys Fire and Rescue Service spokesperson said "good progress" was being made.
We have six pumps from @mawwfire and two water bowsers at a Barn Fire Hundred House, good progress being made by crews pic.twitter.com/jK0Bd5UaYo
— Powys Command (@CommandPowys) July 26, 2019
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