  In this paper, we reanalyze the M1.2 confined flare with a large
extreme-ultraviolet (EUV) late phase on 2011 September 9, focusing on its
energy partition. The radiation ($\sim$5.4$\times$10$^{30}$ erg) in 1$-$70
{\AA} is nearly eleven times larger than the radiation in 70$-$370 {\AA}, and
is nearly 180 times larger than the radiation in 1$-$8 {\AA}. The peak thermal
energy of the post-flare loops is estimated to be (1.7$-$1.8)$\times$10$^{30}$
erg based on a simplified schematic cartoon. Based on previous results of
Enthalpy-Based Thermal Evolution of Loops (EBTEL) simulation, the energy inputs
in the main flaring loops and late-phase loops are (1.5$-$3.8)$\times$10$^{29}$
erg and 7.7$\times$10$^{29}$ erg, respectively. The nonthermal energy
((1.7$-$2.2)$\times$10$^{30}$ erg) of the flare-accelerated electrons is
comparable to the peak thermal energy and is sufficient to provide the energy
input of the main flaring loops and late-phase loops. The magnetic free energy
(9.1$\times$10$^{31}$ erg) before flare is large enough to provide the heating
requirement and radiation, indicating that the magnetic free energy is adequate
to power the flare.
