Power utility Eskom on Wednesday called on consumers to switch off geysers, pool pumps and all non-e.
Despite huge interest in the PSL fixture, Swallows will sell only 15000 tickets for the 18000-seat venue.
Swallows' brand and communications manager Siyabonga Sangweni said: "We expect a huge crowd because Chiefs are in the running for the league and have a big following.
"The stadium can accommodate 18000 but, after consultation with the PSL, we have decided to sell 15000 tickets for security reasons.
"We started selling tickets on Monday and expect to put up a sold-out board by the end of this week."
Sangweni said R40 tickets for adults would be on sale only at Computicket outlets and Shoprite stores.
He said their decision to sell tickets through this system was prompted by adult fans fraudulently buying R10 juvenile tickets.
"They change R10 to R40 (on the tickets sold at the ground) with a black pen, for night games, making it difficult for security guards to pick it up."
Sangweni also warned that police in civilian clothing would patrol the grounds and arrest anyone trying to sell counterfeit tickets.
On the game, Sangweni told Chiefs not to expect an easy ride.
"We always do well against the so-called top guns. We are not a charity organisation and are not in the business of donating points. We want maximum points to qualify for the top-eight spot.
"There will no favours because we also want to protect the image of our club. Chiefs will get a shock if they expect an easy game."