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In my reading on this topic you are never going to come out on top from a cost perspective. When I build my retirement home someday I want to have enough renewable energy to maintain a reasonable amount of comfort during outages or long term SHTF.
For me, that would mean enough power to keep the HVAC blower operational or an attic fan, keep the freezer/fridge working, water/well pump, power my ham radio, some basic lighting, and charge my laptop. If your property adjoins the lake could you take advantage of that for a geothermal heat pump using a lake loop. I would plan on using fuel oil for supplemental heat with a large tank. I guess if you had a very large supply of wood you could use a wood stove.
You might want to post this in the survival forum. Lots of people there have some experience doing this.