[en] Estimation of the radiation energy of 15 thousand flares observed during the period of 1978-1979 is made and the analysis is performed of their energy distribution. The equation is suggested for energetic flare index which is characteristic of the flare energy release. The arguments are presented in favour of the idea that solar flares are an independent class of events on the Sun. It is shown that the energy distributions of the flares both on the Sun and on the UV Cet-type stars can be expressed by power dependences and have the same exponent