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Ultra-luminous X-ray sources (ULXs) are off-nuclear sources having unusual luminosity in X-rays, nearly or higher than the Eddington limit. Though they have been studied extensively using data from different observatories, their powering mechanism is still a topic of debate. It is believed that stellar mass black holes (BHs) accreting in the super-Eddington limit, intermediate mass BHs accreting in the sub-Eddington regime or accreting in the super-Eddington regime with lower accretion efficiency can power such systems. In this work, we studied X-ray spectral variability of the ULX NGC 4395 X-1 using two decades of XMM-Newton observations from 2002 to 2022. It is one of the nearest ULXs detected outside our Galaxy at a distance of ~5 Mpc. The X-ray luminosity of this source is (1-3)x10^39 erg/s. This source also exhibited variability and X-ray flaring activities over time. All available spectra of the source are fitted using both phenomenological and physical models. In this talk, I will discuss the progress of the work in understanding the powering mechanism and the intrinsic properties of the central black hole from different model fitted parameters.BGS Office