When looking for quotes, one electrician said I needed to upgrade 100A -> 150A in order to install a NEMA 14-50 plug. From what I heard, the costs would of been between 8-10k just for hydro to do their work and then probably another few thousand for running a new wire from meter to panel, upgrade panel, install plug etc.. Luckily other electricians said I didn't need to upgrade and they were right, the work is all done now and ESA inspected on 100A.