I have a modest set of solar panels on an entirely ordinary house in suburban London. On average they generate about 3,800kWh per year. We also use about 3,800kWh of electricity each year. Obviously, we can't use all the power produced over summer and we need to buy power in winter. So here's my question: How big a battery would we need in order to be completely self-sufficient? Background …
Do some quick math. How much pumped hydro in terms of acre-feet would be required to power a hypothetical city like Chicago at night? Where would this theoretical reservoir be built?
That’s a completely unnecessary way to do things. The mistake you’re making is that this specific way must provide all power.
It doesn’t. You combine methods for a reason. The wind blows at times when the sun isn’t shining, and vice versa. We have weather data stretching back many decades to tell us how much a given region will give us of each. From there, you can calculate the maximum lull where neither is providing enough. Have enough storage to cover that lull, and double it as a safety factor.
Getting to 95% water/wind/solar with this method is relatively easy and would be an extraordinary change. Getting all the way to 100% is possible, just more difficult.
Not if you do HVDC lines. Which are a good idea, anyway. In fact, we might not need to build a single new bit of hydro if we have a good set of HVDC lines.
It isn’t so much limited by the geography but is made far more cost effective because of it. A long valley with a narrow exit means you don’t need to build much dam and store a vast amount of water.
As far as distance from populated areas, I dunno, I live in the UK so its kinda close enough not to matter too much.
Pumped hydro exists.
Do some quick math. How much pumped hydro in terms of acre-feet would be required to power a hypothetical city like Chicago at night? Where would this theoretical reservoir be built?
That’s a completely unnecessary way to do things. The mistake you’re making is that this specific way must provide all power.
It doesn’t. You combine methods for a reason. The wind blows at times when the sun isn’t shining, and vice versa. We have weather data stretching back many decades to tell us how much a given region will give us of each. From there, you can calculate the maximum lull where neither is providing enough. Have enough storage to cover that lull, and double it as a safety factor.
Getting to 95% water/wind/solar with this method is relatively easy and would be an extraordinary change. Getting all the way to 100% is possible, just more difficult.
I can’t stop laughing at this as a unit of measurement
It’s easier to visualize than 325 kilo-gallons.
But is extremely limited to specific areas with the right geography that are also relatively close to a population centre.
Not if you do HVDC lines. Which are a good idea, anyway. In fact, we might not need to build a single new bit of hydro if we have a good set of HVDC lines.
It isn’t so much limited by the geography but is made far more cost effective because of it. A long valley with a narrow exit means you don’t need to build much dam and store a vast amount of water.
As far as distance from populated areas, I dunno, I live in the UK so its kinda close enough not to matter too much.