Anker solix battery and some solar panels to charge it, you could do most of your house off that. Not sure which brand is best to go with but that at least let's you look up some example products. That gives you a plug and play type of setup for the solar/battery system but it will may cost more than building your own.

How would you reduce energy consumption without using less energy? Not sure if this counts as obviously it is using less energy... Either way, turn the heating down for the house, even more in rooms you don't use often. Then get a heated blanket or hot water bottle to warm your self up.

Firewood might be a cheap energy source to look at. Heat a bunch of water (or any large mass) with a short clean high temp fire and then let the water keep an area warm for a long time. Like a giant water bottle really, you could pump it through a radiator depending on the scale you want. You can heat yourself or an entire house like this if you want to but that depends on your DIY skills or what quality of workmanship you see as acceptable.

You can get easy to use plastic pipes and quick attach fittings that are very easy to use your self at home. Check their temp limit, 60c seems like a common maximum so I would heat up a water barrel that can take that or more and use a thermometer to check it's not going over the limit for the pipes. If you go copper them you can go until it starts to boil.