And yep, in places like BC where most of the population lives in cities, you tend to get laws much more oriented towards what city dwellers want.
Obviously, newer and improved tech would be even better, and if we have it, that's great. But I'm not convinced we need it.
Even if we were just stuck with today's 2019-era technology, we could still meet this mandate by 2040, just by widely deploying the green technology we already have on-hand today.
Rural and suburban communities don't need any reduction in quality of life to meet this mandate, we just need to deploy today's tech reliably out there.
So there will be more than 21 years to discover an alternative.
With a decade or two more of cost scaling, we may be able to very effectively deploy solar in a lot of places we wouldn't consider today due to economics.
Most towns/cities aren't nearly as space constrained outside the lower mainland, so larger non-rooftop solar would be an option (along with the wind/hydro/etc that others have mentioned)
Solar power actually works better to the north where there is less cloud cover, eg see https://en.wikipedia.org/wiki/Solar_power_in_Alaska and https://energyhub.org/yukon-territory/.
Lots of mountains, but sparsely populated so they don't need to find all that many locations.
Solar can work in the interior, but isn't much use on the coast.
Hydro is the main renewable source of energy out here. It has it's issues of course, but it does provide a lot of cheap, reasonably-green energy.
You'll be lucky if it's mere millions: https://www.theguardian.com/environment/2017/dec/21/devastat...
Today, a single rechargeable AA battery can hold twice the power as that '80's hot-dog battery. That's a big improvement, over 10x more dense, with more improvements in the pipeline.
I know what you're talking about - but if you're talking about things like the Tamiya Grasshopper or similar - those RC vehicles were not "kids toys" but rather hobbyist-grade RC. At the time, a full setup would cost a few hundred dollars; even today, to purchase a new Tamiya RC kit vehicle, it will set you back a couple hundred when you factor in everything.
I know this because I recently did it; the car was a little over $100.00 off Amazon, then I had to pick up the electronics (which I didn't go cheap on), plus I added some "hop ups" (better motor, ball bearing upgrade, tires, etc). Then the battery and charger.
So - even today - I wouldn't classify it as a "kids toy" (teenage and older hobbyists don't qualify as "kids" in this sense, but that's just my opinion of course); there's too much money involved. If you or someone you knew had one of these plus all the other stuff, they were a lucky person indeed (a friend of mine in middle school had one, back when the ESC was resistance-based - I went in a different direction, and had a bunch of computer crap - so I guess we were both lucky in different ways).
I consider kid's RC toys to be anything costing under $100.00 and "ready-to-run" (RTR), usually without any kind of real servo or speed controls (that said, even that level has changed greatly; what you can get today for around $50.00 beats the pants off of anything you could get for that amount in the 80s - even in 80s dollars).
They were typically 6x sub-C cells, with a capacity of 1000mAh. (I remember paying extra for a 1300mAh pack!). You can get 5000mAh cells today, so it's a 5x improvement.