Claims of sabotage at Eskom's fleet of ageing coal-fired power plants supplying the bulk of South Africa's electricity, and which are prone to mechanical breakdowns, have swirled around for years, but De Ruyter's comments on Friday were the firmest yet from a senior executive.
"The evidence does appear to be, at least prima facie, incontrovertible that there is malice afoot and that we need to take action," he said during a media briefing.
Discovered on Wednesday evening, the toppled pylon, which showed no signs of metal fatigue or corrosion, is found along the main distribution lines feeding coal conveyor belts at the 3,708 megawatt (MW) Lethabo plant in the Free State province.
"What further arouses suspicion that this was a deliberate act of sabotage is that nothing was stolen from the site ... so this was not an economic crime," he said.
Quick action by Eskom prevented Lethabo power station from running out of coal, a prospect which could have worsened power cuts to Stage 6, when around 6,000MW is shed from the national grid, versus Eskom's nominal installed capacity of 46,000MW.
De Ruyter did not speculate on the motives behind the attacks, which come amid mounting criticism of Eskom management's inability to stop power cuts.
He said Eskom was using infrared-equipped drones to help patrol strategic infrastructure, but it was virtually impossible to safeguard some 390,000km of transmission and distribution lines.
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