Despite the known benefits of simulations in the study of mixed energy systems in the context of smart grid, the lack of collaboration facilities between multiple domain experts prevents a holistic analysis of smart grid operations. Current solutions do not provide a unified tool-chain that supports a secure and collaborative platform for not only the modeling and simulation of mixed electrical energy systems, but also the elastic execution of co-simulation experiments. To address above limitations, this paper proposes a design studio that provides an online collaborative platform for modeling and simulation of smart grids with mixed energy resources.