Looks like the law was passed in 1980 due to the 1970s energy crisis, but it was repealed back in 2008: https://www.twincities.com/2008/01/15/bill-would-allow-for-h...

Reminds me of the misguided pepper spray law that was relaxed a decade ago, but Amazon still won't ship completely legal pepper spray to Wisconsin and a bunch of sites still claim it has draconian regulations.