AT-TE firepower | a 20 meter (65 ft) fireball (recorded at Geonosis)

AT-TE artillery yields a 20 meter (65 ft) fireball during the 1st battle for Geonosis, hinting at the capacity to harness energy-yields in excess of 1e9J. BlasTech article:
https://www.blastech.info/pyrotechnics

Note the fireball is scaled against the Hardcell Techno Union Transport. The AT-TE gun could not pierce the transports main armour, so the blast & fireball was produced entirely by the weapon itself. Even the much more powerful mass-drivers on a LAAT could not pierce the Hardcell's, main armour, and had to strike a relative-weak-spot "just above the fuel cells" to have an effect.

QUOTE: "Aim right above the fuel cells" - Anakin Skywalker directing LAAT crew on mass driver missile placement for effect against a Hardcell transport.

Note the anti-personnel blasts at 0:49, likely produced by anti-personnel laser cannons mounted in ball turrets on the Republic's LAAT gunships or AT-TE tanks, or possibly by small-arms blaster rifles set to full power.

The footage was taken from the 1st battle of Geonosis
Source: Star Wars Episode II Attack of the Clones