The first time the Flint Lockwood Diatonic Super Mutating Dynamic Food Replicator (FLDSMDFR) is activated it requires over 17000 gigajoules (or 17 terajoules), which alters the weather and creates a rain of cheeseburgers. That's 4.0630975 kilotons.
Final Results
FLDSMDFRs first activation = 4.063 kilotons
This is the first time it activates too. It later becomes far more powerful.