Johannesburg City Power says it suspects that the cause of the explosion at the Rand Water Eikenhof pumping station was a "result of a deliberate act of sabotage".A video had emerged which proved that the fire had originated outside the transformer at the substation, City of Johannesburg Mayor Herman Mashaba said in a statement on Tuesday.Mashaba said the transformer appeared to have been "maliciously damaged so that it would leak oil onto the fire"."These facts are simply not consistent with a fire originating from an electrical fault."I have requested that City Power immediately refer this matter to the City's Group Forensics and Investigation Services (GFIS) and the South African Police Services for further investigation," Mashaba said.On Monday, Rand Water spokesperson Justice Mohale said that an electrical transformer belonging to City Power had exploded. City Power engineers and technicians had worked throughout the night to repair the substation.Power expected to be back on within 24 hours"To alleviate the situation, a newly refurbished transformer has been brought in and has been tested," Mashaba added.It was estimated that repairs on the residential lines would be have been completed by 18:00 on Tuesday evening.Power was expected to return to Rand Water pumps and the affected areas within the next 24 hours."When key infrastructure of this nature is vandalised, it is a crime against the people of our city, our economy and our security." The suburbs that might be affected include the following:Roodepoort/Randburg area:Bergbron, Claremont, Delarey, Whiteridge, Roodekrans (all extensions), Wilropark (all extensions), Helderkruin (all extensions), Constantia Kloof (all extensions), Allens Nek (all extensions), Weltevreden (all extensions), Florida Hills, Florida North, Discovery (all extensions), Selwyn, Florida Township, Horison, Horison View, Roodepoort North, Florida Park (all extensions), Constantia Park, Honeydew (all extensions), Zandspruit, Laserpark, Randparkridge, Cosmo City, Lanseria, Thabo Mbeki informal settlement, Olivedale, Sundowner, Northwold, Boskruin, Bromhof, Kya Sands, Bloubosrand, Eagle Canyon, Honeydew View, Poortview, Ruimsig, Wilgeheuwel, Princess, Grobler Park (all extensions), Lindhaven, Little Falls, Harveston, Honeydew (all extensions) and parts of NorthridingLanglaagte/Southdale area:Mondeor, Southgate, Meredale, Alan Manor, Eagles Nest, Southfork, Kibler Heights, Eikenhof, Lougherin AH, Coronationville,Westbury, Claremont, Triomf, Westdene, Newlands, Greymont, Albertskroon, Albertsville, Langlaagte, Industria, Bosmont, Riverlea, Longdale, Vrededorp, Fordsburg, Brixton, Mayfair, Cottesloe, Janhofmeyer, Rossmore, Hursthill, Montclare, Melville, Emmerentia, Auckland Park, Greenside, Westcliff, Parkview, Fairlands, Berario, Northcliff (all extentions)Soweto area:Pimville, Power Park, Diepkloof, Orlando East, Orlando West, Dobsonville, Naturena Klipspruit, Meadowlands, Comptonville, Meredale, Moroka, Jabavu, Molapo,Jabulani, Tladi, Moletsane, Mofolo South, Mapetla, Zola, Zondi, Naledi (all extensions), Emdeni, Mofolo North, Mofolo Central, parts of Dube, Chiawelo and extensions, Protea North, Protea South, Dhlamini and extensions, Eldorado Park and all extensions, Klipspruit west and KlipspruitHospitals affected:Wilgeheuwel, Flora Clinic, Olivedale, Helen Joseph, Crescent Clinic, Garden City, Rahima Moosa, Baragwanath , Tshepo Themba and Lesedi Clinic.