If Solar doesn’t work for most of the evening, how can it compete? Wouldn’t we be better off with Coal? Isn’t coal better for generation – you know, its baseload!
Yes, its another post based of an answer to something asked on MyBB!
At first glance, you’d think so, however the math tells a different story.
As I like to do in my posts, I’ll first go over some basics
Solar PV farms are built to supply electricity at a certain price. This price per kW.h is usually awarded with an REIPP auction where vendors bid to supply a given amount of electricity – typically 100MW or less at a certain price. The price paid is then guaranteed by the government for every kW.h supplied for a 20 year contract, typically with small escalations per year.
Eskom has a generation capacity of roughly 45GW in total. Due to decades of neglect, horrifically bad decision making, and outright theft in some cases, this generation capacity is now closer to 30GW; sometimes even less.
What does generation capacity have to do with anything though?
This is easily answered by looking at demand. Sigh, I hear you say. What’s demand?
Demand is the counterpart to capacity. Demand is the amount of power we need to supply at a given time point. Luckily this is fairly predictable on a daily weekly or monthly basis, and usually measured for time periods between daytime, evening and night.
Both orders I made had teething issues. Process for managing issues on both apps / services is a bit lacking, as is driver training. Overall the Checkers app is substantially better, although limited in the size of orders you can make (one motorbike load). The Checkers App substitution mechanism is highly non-optimal though, as it needs to be done on a item by item basis. I also couldn’t see any “specials” via the App. i.e Store Card specials. If you wanted to get those, you’d need to go to the shops in person. Not sure why that can’t be integrated into the App – they have your store card details already in there, tie it in! PnP had some specials in app, although similarly to Checkers, none of the PnP store card specials are listed.
PnP Bottles (bit of a weird name for a grocery app, I suspect they bought an existing app off someone else) is similar to the Checkers Sixty60 grocery ordering app, in that you can order online. Similarly to the Checkers Sixty60 ordering app, its also App only. Bleh!
PnP want a whole slew more personal info for sign up ahead of ordering, in comparison to the Checkers60 App though.
Score -1 for that. There was also no indication of what they want to do with all my info.
While (or should I say when) I live in Cape Town, I do live in a slightly rural part, so don’t have much in the way of food delivery. No uber eats, and the only junk food delivery is so-so pizza (Debonair’s).
Grocery delivery on the other hand seems to be picking up, as this last year – (referrring to 2020 – seeing as we’re barely into 2020+1), I now have two, yes two grocery delivery options.
Thanks to MacAfrican for the criticism in my comments, otherwise I’d be too lazy to do this post 🙂
Onto the math –
Predicted cost at the moment for a daily use PowerWall is $4000. Rand is currently hovering at R16 (lets hope Zuma doesn’t open his mouth in the near future, as that historically has lead to large drops in Rand values).
Energy efficiency is something everyone can aim for – its typically only a minor expense and long term you save. Heck, given our electricity costs, short term we save!
Today, I look at roof insulation.
In Cape Town, we have hot summers, and coldish winters. Sure, it *feels* cold to us, but I’ve spent many a winter in far colder places.
The worst being Harbin at -40c!
I can safely say:
#1 it does freeze before it hits the ground.
#2 don’t eat the yellow snow 🙂