I've been messing about in my (relatively) new Corvette
I almost got my arse shot off because I switched out some modules, including adding Rail Guns, but didn't check my power usage. I let myself get interdicted by a Deadly Anaconda, then when I pushed the button to deploy hardpoints my ship just went dark.
I managed to get back to a station and play around with priorities enough to be able to fight the ship. I haven't had to do that very much since I had my Vulture.
Shortly thereafter I learned how much the 8A Power Plant costs (134.7M CR in a LYR system). I don't have that kind of cash unless I sell my FdL or Python, and I'm not planning to do that. So, I'm stuck with the 8B PP for now, and I have to decide whether the spend time getting it Engineered. Maybe I'll just switch over to my AspX or my Python and run pax missions to build up my bankroll...