The issue isn’t really comparing high noon to midnight. The issue is comparing prices at either high noon (when supply is large) or midnight (when demand is small) to the space in between, especially dinnertime (when demand peaks just as solar supply finishes tailing off). There are ways to move some of that peak into noon (e.g: if homes are well insulated, they can be cooled or heated while solar is still up and used as a thermal battery to at least bridge over to the nighttime hours), but some of the peak is much harder to shift around. If everybody starts cooking and turns on the television around dinnertime, the only way to distribute that is to stagger dinnertime, which is easier said than done for a lot of people’s schedules. Having power storage to bridge that gap (wouldn’t it be nice if everyone that has an electric car got home and used whatever range they had leftover in their battery to absorb their extra demand and then start charging again at nighttime rather than immediately start charging at the worst time of day. Or having solar plants that store excess daytime power in thermal, hydro, or chemical batteries to discharge and increase supply later) is likely easier than convincing enough people to work odd shifts or delay their after work leisure activities
If that’s the case or becomes the case, isn’t it easily solvable since the batteries only need to store the energy for a few hours? Maybe some spinning wheel thing?
It is a very solvable problem, and mechanical or thermal batteries are likely to be at least part of the solution. Of the three kinds of gaps/shortfalls that grid storage would have to cover, the milliseconds-long and hours-long gaps are probably the easiest to solve. The days-long gaps (stretches of cloudy days, low winds for extended periods) is probably the most expensive to solve, but even those are not really that difficult (hydro storage is a tested technology that works well and HVDC transmission linking regions together can allow local shortfalls to be covered by remote surpluses). It’s all more a matter of building capacity than needing new technology to solve an unsolvable problem, from what I understand
Longevity is the big problem. Every practical method of energy storage I can think of is negatively impacted by frequent charge discharge cycles. Even a flywheel like you suggest would eventually need new bearings, need rebalancing, etc…
The issue isn’t really comparing high noon to midnight. The issue is comparing prices at either high noon (when supply is large) or midnight (when demand is small) to the space in between, especially dinnertime (when demand peaks just as solar supply finishes tailing off). There are ways to move some of that peak into noon (e.g: if homes are well insulated, they can be cooled or heated while solar is still up and used as a thermal battery to at least bridge over to the nighttime hours), but some of the peak is much harder to shift around. If everybody starts cooking and turns on the television around dinnertime, the only way to distribute that is to stagger dinnertime, which is easier said than done for a lot of people’s schedules. Having power storage to bridge that gap (wouldn’t it be nice if everyone that has an electric car got home and used whatever range they had leftover in their battery to absorb their extra demand and then start charging again at nighttime rather than immediately start charging at the worst time of day. Or having solar plants that store excess daytime power in thermal, hydro, or chemical batteries to discharge and increase supply later) is likely easier than convincing enough people to work odd shifts or delay their after work leisure activities
If that’s the case or becomes the case, isn’t it easily solvable since the batteries only need to store the energy for a few hours? Maybe some spinning wheel thing?
It is a very solvable problem, and mechanical or thermal batteries are likely to be at least part of the solution. Of the three kinds of gaps/shortfalls that grid storage would have to cover, the milliseconds-long and hours-long gaps are probably the easiest to solve. The days-long gaps (stretches of cloudy days, low winds for extended periods) is probably the most expensive to solve, but even those are not really that difficult (hydro storage is a tested technology that works well and HVDC transmission linking regions together can allow local shortfalls to be covered by remote surpluses). It’s all more a matter of building capacity than needing new technology to solve an unsolvable problem, from what I understand
Longevity is the big problem. Every practical method of energy storage I can think of is negatively impacted by frequent charge discharge cycles. Even a flywheel like you suggest would eventually need new bearings, need rebalancing, etc…