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Considering the time it takes to can goods and expense in canning equipment to start with, can somebody tell me what the advantages that canning has over just freezing?
I don't worry about losing electricity. But it still costs about $30 a year to run a freezer. The cost of heating the water for canning offsets that somewhat, more/less depending on what you freezing, what you are canning, and how much you are processing at a time. Oh, and whether you have a gas or an electric stove -gas being less expensive.
The much bigger reason -
Shelf space is much less expensive than freezer space. I just build shelves for (9'x2'x6' I had to do the math) 108 cubic feet of shelf space for less $100 (counting the original cost of the "scraps" I used.) It cost over $600 for 20 cubic feet of freezer space.
Also, I have more basement space than garage space and cannot get a freezer down the basement stairs.
Using prices from a few years ago for both canning equipment and freezer equipment because I haven't checked prices of either lately:
Canning: pressure canner $100, tools (jar lifter and lid magnet) $15, quart jars with lids and rings $10/doz x 10 doz $100 for total of less than $250.
Freezing: freezer $600, ziplock freezer bags $8 for 120 quart size, $8 for 60 gallon size for a total of over $600.
Most of my jars were bought at garage sales, auction sales, or inherited but I bought enough brand new to remember the price. The price give was the price new then - its about $15 or $16 per dozen now.
Numbers of jars/bags are kinda arbitrary but the proportion is noticeable. Even if you buy all jars new and never need to buy plastic bags for freezer food, the cost difference doesn't change much.
Canned food is a bit lower in nutrition value than frozen food on day one. But canned food holds its nutrition value better than frozen food.
I like the taste and texture of some foods better when they are canned than when they are frozen (especially peaches). To be fair, I like other things better when they are frozen (like broccoli).
I like having both options.