But having electricity 13 days every two weeks is much better than not having it at all.
This isn't about China building out their grid with an over capacity factor of 200% so they can keep everything running even if rain, sun and wind all fail for months on end. This is a developing county getting to the point they can charge mobile phones consistently.
By comparison, global battery production is around 1,000 GWh per year.
For something like 20 years, people have been looking at the exponential growth in the annual solar deployments and saying "well that's it, starting next year we're only going to deploy exactly as much as last year, plus 5%-30%". And every year these predictions are proven wrong. And every year they do the same dumb thing again:
https://pv-magazine-usa.com/2020/07/12/has-the-international...
Let's not repeat the same projection mistake with batteries that's been going on with solar for so long.
Realize that replacing all ICE road vehicles in the US with 70 kWh BEVs would require storage equal to ~40 hours of our average grid usage. The future is going to need large numbers of batteries, which is why China has been all in on this.
Regardless, 14 hours of China's electricity demand is a whopping 40,600 GWh. By comparison, 2024's lithium ion battery production figure was 1.5 TWh [1]. Even assuming 100% of this went to EV's we're still talking about roughly 25 years worth of global battery production to fulfill only China's demand for storage in this model. As you point out, we still have loads of battery demand for EV adoption, so nowhere near 100% of production will be able to be diverted to grid storage.
The scale of storage required to make intermittent sources viable without being backed by a dispatchable energy source really is tremendous, and this often gets overlooked in pushes for a fully renewable grid.
1. https://www.argusmedia.com/ja/news-and-insights/latest-marke...
Assuming someone actually told you that, I think you need to reevaluate the credibility of that source.
Generally businesses are really great at balancing costs, and for highly-cost-constrained businesses if you give them 95% uptime at half the cost, the equation becomes clear. And in Africa, if the option is 95% uptime or 0% uptime, the choice is even clearer.
Where I live, I only get two 9s from the utility. And I'm within commuting distance of Seattle. With my generator, I still got three nines the one year where the battery tender failed and the generator didn't start when needed, but only because that outage was less than 8 hours and I replaced the battery tender before further outages (I could have jump started the generator, but the outage started overnight and waiting it out was easier). Most years, the number of brief outages adds up, and I probably only get five 9s.
Solar + battery + generator for really bad weeks (but make sure you exercise it!) could pretty easily add up to the two nines I'd get from the utility here.
For developing countries, solar + battery alone is likely be better than many grids which often are intermittent rather than 24/7 and many places don't have any access to utility power.
I actually counted the number of outages after I got my battery unit in June -- it was six in five weeks, for anything from a couple of seconds to 30 minutes, which I noticed because the unit clicked over to running from the battery, and the clock on the oven (which is still only mains powered) flashes until I go over and hit a button.
In April I had a 40 hour outage after a storm. That's what caused me to order the brand new Pecron E3600LFP, first New Zealand model shipment in "early" June (I received mine June 19).
In February 2023 I had a 4 day outage during/after a storm.
There are even, every 2 or 3 months, scheduled and notified 9 AM - 3 PM outages for equipment maintenance, tree trimming etc. Just those alone lower the grid reliability to around 99.5%.
Six days outage in three years -- let's call it four -- drops grid reliability by another 0.4%.
So, yeah, two 9s is about right.
With the Pecron base unit (US$999 at the moment still on Halloween special, $1259 before that) I simply don't notice any outage under 4 hours, and that's even with a full winter heating load. In fact I deliberately turn the mains to it off from 7-9 AM and 5-9 PM every day.
A 4 hour outage was a little close sometimes, so in August I added a 3kWh expansion battery ($699 on pecron.com right now).
With 6kWh I can run my fridge, computers, Starlink, some LED lighting for 36 hours. Or 30 hours with typical kitchen appliance usage added (espresso machine, toaster, kettle, microwave, air fryer).
Or virtually forever now I added 6x 440W solar panels (cost me US$400 total) to it, which still generates around 200W between them in even the worse overcast and rain.
I'm running this stuff as a mini off-grid system, not connected to the house wiring at all -- except plugged into a standard socket to charge the battery if needed. I also have a $450 2kW petrol generator which I can use to charge the battery if needed, but needing that should be very rare.
Total cost: under US$3k. More like $2.3k at the current Halloween special prices.
I've never lived anywhere where the power didn't go down for at least a few (cumulative) days a year.
Since then, none of the extended Portsmouth conurbation, Sheffield, Cambridge, rural Cambridgeshire or Berlin have had any problems big enough to even notice while I've lived in them.
I have seen at least two circuit breakers trip in that time though.
In the UK, I think I can remember 3 power outages my entire life. One when there was significant flooding in my hometown as a child, which lasted around a day, once at university for a few hours (local substation failed) and recently 30 minutes overnight while they were upgrading something (with a lot of notice). I may be undercounting/misremembering but I don't think its far off.
I think the main difference is the UK in all but mostly rural areas has all the power lines underground. This is very different in eg North America where you can go a few blocks out of downtown areas and it is all overhead delivery.
Now I live in a rural area and it's uncommon to avoid outages more than a month. We have an automatic transfer switch and fuel generator from previous owners and it saves hundreds of dollars in frozen food.
This is in the US by the way. If you're investing in a transfer switch and generator now, the cost is going to quickly approach a modest solar + battery set up with a whole house inverter, and of course, you save money all year that way, not just in outages.
I'm surprised that someone would think days of power outages are normal everywhere. My family used to get hit with 8+ hour outages every few years back in the 90s because we were at the end of a single long rural feeder line, and we thought that was an unacceptable frequency.
PS I don't live in the US.
What city do you live in?
The cause around here is usually storm + trees + above ground power lines, plus a low enough population density that you're not top priority for the utility company.
I was surprised that the original comment said they were in a city
Correction: should have a lot of 9s.
But in a lot of places in the U.S., even rich states, it doesn't because a combination of regulatory capture, profiteering and straight corruption.
I can see why solar and batteries are so attractive because at least its your prerogative when the power goes out.
Not everybody can afford the up front costs of installing solar + battery storage, plus replacement when the PV cells and batteries inevitably reach EoL. These people will be left behind on a decaying grid nobody with political capital wants to fix or at the mercy of landlords.
I really don't like this attitude we have in America where we realize "thing is broken" and advocate throwing it away instead of trying to fix it.
Because people are too busy playing Team Politics instead of solving issues that everyone can get behind.
Fixing the power grid is one of those things that everyone could get behind, and yeah I agree, it disproportionately affects the economically disadvantaged.
Oh boy.
They are incentivized to BULID but not to maintain or upgrade because that grants them guarantee rate of return.
It was enlightening to see what caused the big blackout during a big snowfall in texas a few years ago
Of course there are failure modes in any approach but "oh no! Herding cats is hard. Who could have imagined!" is funny to me
According to PVWatts, a 10kW solar system would get me very close to my average usage in December. I'd be way over in the summer, could probably get away with a 4kW system and dial back use during an outage. I can lease two Powerwall 3 batteries from my utility company for $55/mo.
Or look at: https://www.franklinwh.com/products/apower2-home-battery-bac...
Edit: this also looks like a good option: https://www.santansolar.com/product/the-homesteady-kit/
We used to lose power 3-4 days a winter in our old house. It would have been really nice to have heat. A generator or smaller system could handle that.
The trouble with relying on the weather for your electricity is that it is entirely possible that you will go five days straight with cloud cover, limited to no solar generation and then be freezing. This is the problem that the electricity grid solves with varied sources of generation.
Solar and wind tend to be regularly and predictably intermittent but not unreliable. That's something you can design around. Especially when you have cheap storage to handle critical loads.
It's instructive to look at California's ISO website's supply graphs over the year. Renewables follow a reliable daily cycle.
Consider a family with two cars instead of one. How often do they have zero working cars? The correlated failure rate squares while the cost doubles.
My home now has a grid connection, house battery and solar, a caravan with mounted solar/battery/fridge/inverter beside it, and I also have a portable “powerstation” and portable solar panel which is basically a UPS. My fridge contents and phone charging needs have a several extra 9’s now for costs that have scaled very well.
These systems are tech that is improving rapidly. In some years these African farmers with their increased yields will likely add a bigger, second solar & battery system. In a village you can run a cable next door. Etc.
https://en.wikipedia.org/wiki/Northeast_blackout_of_2003
Not as many as you might think.
I mean, it very much depends on where you are. Three 9s would be no more than about 8 hours downtime per year. A lot of rural locations would do worse than that, realistically.
Does decentralized solar plus batteries give you same amount of reliability? How many days without sunny weather can you survive without having to change your energy use habits?
Each 9 of reliability for infrastructure is EXTREMELY expensive. And grid has a lot of 9s.