Cumulative distributions of the rate of optical flares detected with TESS as a function of their energies. Black points and black lines refer to KELT-24, and red symbols and lines refer to WASP-18. The vertical lines mark the peak from the best fit to the histogram of flare energies (cf. Fig. 5). The fit to the points of the distributions above the knee are marked with solid lines. The slope is about −2.57 ± 0.04 (dN/dE ∝ E^{−1.57 ± 0.04}) for KELT-24 and −2.04 ± 0.07 (dN/dE ∝ E^{−1.04 ± 0.07}) for WASP-18.