I've thought about this a lot - not having a mooring isn't choice, more of a situation people are stuck with round Stratford - it's a bit of a holiday destination for many, so a lot of people rent the moorings permanently even if there's no-one aboard half the year.
Power I've thought about - a generator, good battery management system, solar panel and wind turbine are things that are high on my priority list. As for security, I'd be stuck with whatever I can get. Again not ideal.
I'm not wanting to flout the system, the second there's a mooring available I'll be grabbing it. But it's that wait for a mooring that's the problem.