It’s still not earning you money to spend electricity because you still have to pay the transfer fee which is around 6 cents / kWh but it’s pretty damn cheap nevertheless, mostly because of the excess in wind energy.
Last winter because of a mistake it dropped down to negative 50 cents / kWh for few hours, averaging negative 20 cents for the entire day. People were literally earning money by spending electricity. Some were running electric heaters outside in the middle of the winter.
When I was growing up, my parents house had thermal storage electrical heating. Generally the heat was only “on” at night when electricity was cheap, then we’d control the temperature during the day with circulation fans. I remember it working really well while saving a ton of money.
Where is the thermal storage heating now? I specifically could use a mini-split heat pump, where the head unit is thermal storage, but I don’t see any such thing online
I read about a, Finnish?, project whete they heated up sand, but in large silos in IDK 500°C or more. Could sit there for months apparently.
Yeah, I’m sure the solution would require both large scale storage and point of use storage
Sure, not to mention they should probably cut out all the electric stuff that eats up like 80-90% of the suns efficiency and use mirrors directly. I mean if you gave the “battery” close.
That is exactly why rates are going negative during the day now. Baseload generation benefits from artificial increases in the base, off-peak load. With solar and wind generation increasing, we now have a need to reduce that base, overnight load, and increase peak, daytime load.
Let me rephrase: “ the heat was only “on” … when electricity was cheap” which at the time was overnight. That was 1970’s tech so basically a mechanical timer, but the timer could be set to whenever, plus surely current technology could be used for a smarter solution
Edit: I currently opt into a program to shift load, in return for a bonus on my bill. My smart thermostat is able to pre-cool the house before the peak time, and only shaves off two degrees at peak, so it maintains adequate comfort while helping shift load (assuming enough consumers join)
Thermal storage needs to be quite large though, at least with the stone/brick like mass they used back then. And you need to isolate it, otherwise you have no control over the release of that stored heat. I wonder if new materials, maybe something that undergoes phase change in that temperature range, could be a lot more space efficient.
It doesn’t have to be large, or the size is related to the use case. In the house I grew up, they were similar size and shape to standard radiators and worked well through cold winters in upstate NY
Consider a single radiator in a house. You only need storage sufficient to use that radiator for one day. And it doesn’t matter too much if it can’t cover extreme temperatures, as long as it is sufficient to cover peak prices most of the time
I finally found one. Why aren’t there choices like
https://stash.energy/en/
thermal storage is kind of complicated and sucks a little bit, probably.
You can still do the heating thing, using your home as a thermal battery for example. You could also put a large thermal mass within your home, thousands of gallons of water (for example) directly integrating a thermal battery and optimally using it probably just isn’t as viable as not worrying about it and doing something else.
It doesn’t have to be complicated, or the complexity is related to the use case. Does not need water or moving parts.
Consider a single radiator in a house. You only need storage sufficient to use that radiator for one day. And it doesn’t matter too much if it can’t cover extreme temperatures, as long as it is sufficient to cover peak prices most of the time
I finally found one. Why aren’t there choices like
Edit to circle back to the goal: now I can move toward cleaner energy by electrifying my house. I can save energy/money by using the most efficient heating technology. If there was thermal storage, I could save even more money with “time of use” metering and the utility can shift their load to make up for the peakiness of sources like solar. If I installed solar on my roof, I could potentially heat my house entirely with “free” energy
yeah, but if you’re not doing it in a complicated manner you could just stick an IBC tote full of water in the middle of your home and it would provide a similar effect.
Personally i would probably just install a ground loop, and then use that to provide a source for heating and cooling, it’s also very consistent year round, though if you live in an area of deep frost lines, or permafrost, it’s probably going to be more exciting.
Unfortunately a ground loop can be expensive, especially for those of us in urban areas.
I read an analysis once that you could never make back the cost on energy saved. Whether or not that’s always true, I know I live in a high cost area with a yard that a drill couldn’t get to, cris-crossed with 80 years of utilities.
that’s true, though to be fair i’d be the one installing it, i’m not paying other people to dig a hole lol.
Technology Connections has been arguing to just use the air in your house for this purpose - e.g. running air conditioning only at night, or allowing the power company to run it in advance of peak demand.
I got this, works decently for a short period.
My smart thermostat allows me to opt in to a program where the power company can adjust the AC during peak periods, and I get an annual bonus on my bill. It does actually precool the house: sets the temp down two degrees for a bit, before peak where it sets the temp up two degrees.
However my house isn’t sufficiently weatherproofed: their changes can be 2-3 hours but the pre-cooling doesn’t help for that long