Not talking supply chain, talking smelter. Supply chain would still exist, **** just won't get smelted here. I didn't say cutting only BHP would save 50%, but yes, smelting and mining together use roughly 50%. BHP alone uses about 1GW. Total all the smelters and its 10-15GW. THEY ARE THE BIGGEST USERS, and the smallest employers in 'industry'. All other 'industry usage' is minimal by comparison.
Older '08 gazette, but these figures are still relevant for rough idea(have newer stuffs somewhere, it exists, read it a few months back, just too lazy to look for it).
"The end-use of electricity in South Africa is currently divided between domestic (17.2%), agriculture (2.6%), mining (15%), industrial (37.7%), commercial (12.6%), transport (2.6%) and general (12.3%). South Africa has an installed generation capacity of approximately 40 000 MW. Most of this capacity emanates from coal fired power stations (88%), with the remainder coming from nuclear, hydro and diesel. South Africa's capacity reserve margin has fallen sharply in recent years to around 8%. This has placed considerable pressure on the industry. In response to this development new generation capacity will be added to the system to restore the reserve margin and meet new growth, and also to prepare for the r.eplacement of older plant."
Edit: Even if we were talking supply chain, how many jobs are lost due to load shedding annually, not to mention the billions lost to economy? Lose a million jobs a year and hundreds of billions for the sake of 33k jobs?
Another thing to consider is, when these contacts are up and they now have to pay 4x the price just to meet cost price of generation, do you really think they are going to stick around? No, they going to drop us and run off to another third world **** hole and con someone there to sign a ridiculous contract that sucks the life out of their citizens. We pay for these guys to operate here. 25-30 rand of every hundred you pay on your electricity bill goes to paying for them to be in business. They are earning enough $, they can pay their own damn bills