Good looking creek, how does it do in the summer?
I’m no expert, but I’ll try and give you what help I can.
Your first logical starting point... Find out what you are allowed to do and how to do that legally. If that doesn’t fit yer plan, find out how much trouble you will get into when you get caught and then weigh the risks. If you do it legally, is there a way to register it with local
government to establish a date (because that may allow you a grandfather exception should
future laws change).
Second... Redundancy is your best friend. Backups are great, back ups for the backups are better and a few more backups never hurt anyone. Also, diversity, don’t put all your eggs in one basket. Hydro, solar, wind, geothermal, harvesting methane from compost
piles, etc. Diversify as much as you can and don’t attempt it all at once... Baby step your way there in nice, easy to chew, small bites and try to find a system that allows that incremental growth.
Research... YouTube has a lot of micro hydro videos, watch as many as you can. Then find out what is even possible to purchase, and go from there. Electric batteries degrade over time, consider creative alternatives (like using your renewable energy
to pump water uphill to store for power generation later (not always possible on all land
). Also consider redundancy for your batteries. (letting batteries sit in storage isn’t good, but storing the parts to make your own batteries when you need them is possible for some types of batteries, or plan to buy replacements as yours reach a certain level of degrade).
Power management... What happens when your systems generates too much power or not enough
to meet needs (both can cause issues). A battery bank can only do so much, so it has to be sized right, but you also want a plan for if and when the battery degrades and/or fails.
Give everything plenty of space to cool and be safe from overheating and fire (electronic equipment generates heat and needs to cool... it needs to be protected from the elements as well every damned critter you can imagine that just wants a warm place on a cold day, but it needs enough airspace to cool. This isn’t always easy to balance, and porcupines and rats love to chew wire insulation, protect all wire at all times).
It’s not easy to be your own power company, but it can be nice
at the same time. Hydro is nice because it is steady and runs night and day (unless you have it on seasonal waters, but even then, it’s reliable in the wet season (most are lower output but very consistent). Hydro is great at complimenting other systems like solar and wind (which are not as consistent but deliver higher output when they are strong). At 47°N, you got some mighty long days come summer, very good for solar but only if the land lets you. If you have some high ground, you could be prime for wind.
But your starting point is all based on what you can legally do and then based on what the location offers. Then availability, and so on. Approach it logically and your solutions will present themselves. You could also try to find someone you could hire to do it all for you. That person might not exist yet, and who knows, your experience
might turn you into that person and offer an opportunity.