To further the understanding of physical processes that cause weak flares, it is planned to analyse multi-wavelength observations acquired in the era of high spatial and temporal resolution observations acquired by advanced observatories, for example, Solar Orbiter Mission. Spectrometer Telescope for Imaging X-rays (STIX) is one of the instruments which was flown onboard the Solar Orbiter mission. STIX is a hard X-ray imaging spectrometer observing in the energy range from 4 to 150 keV. The unique orbit of the Solar Orbiter, allowing the spacecraft to reach as close to the Sun as ~0.3 AU, provides an opportunity to observe weak flares with an improved count statistics. This enables exploring the characteristics of non-thermal plasma during weak flares. Besides, the nature of low-temperature flare plasma will be probed using the concurrent satellites which observe in the wavelengths sensitive to low-temperature plasma. Further, microwave emission and hydrodynamical modelling of coronal loops offer an alternative approach to determining the thermal and non-thermal energetics of the flares. Therefore, I plan to understand the thermal-nonthermal energy partition in the weak flares by analyzing the X-ray and Microwave observations. Finally, it is planned to distinguish the nature of physical mechanisms that lead to strongly non-thermal weak flares compared with those that produce thermal weak flares, and their role in widening the applicability of the energy release scheme of solar flares.