Stats SA considers adding self-generated power to data set

South Africa’s statistics agency is considering including self-generated power in its monthly electricity generation data as more households and businesses reduce their reliance on state-owned utility Eskom.

Adding the metric would broaden a key indicator used by economists to compile estimates of GDP at a time when consumers are being forced to find alternative sources of energy because Eskom’s old and poorly maintained plants can’t cope with demand.

“We need to find a smarter way to measure the electricity that is self-generated  because at the moment our monthly survey covers Eskom mostly and there are about 20 other smaller power stations,” Joe de Beer, deputy director-general of economic statistics at Stats SA, said in an interview in Pretoria.

The agency currently doesn’t measure how much power is generated by shopping centres, big mines and manufacturers that use solar plants, he said.

A surge in manufacturing output in September despite the worst month on record of load-shedding suggests companies may be relying more on alternative sources of power supply during blackouts, said Peter Worthington, a senior economist at Absa Bank .

Better-than-expected third quarter economic growth of 1.6%, compared with a contraction of 0.7% in the prior three-month period, may also point to industries using alternative energy sources. 

“Economic activity was reasonably firm in electricity intensive sectors during peak load-shedding months, indicating a higher level of backup usage and alternative sources of energy coming on stream,” said Sanisha Packirisamy, an economist at Momentum Investments.

“That together with a structural decline in energy intensity in South Africa can explain the difference.”

The South African Reserve Bank said last month record power outages mean the economy is only likely to expand by 0.1% in the final quarter. It predicts GDP growth will slow to 1.1% in 2023 from 1.8% this year and assumes increased power rationing will shave 0.6 percentage points off output.

An income and expenditure survey that field workers began collecting data for last month may provide more insight into what households are doing, De Beer said.

The statistics office has also begun surveying big companies on whether they are self-generating power, De Beer said. Discussions are taking place with the National Energy Regulator of South Africa on whether it can supply an annual list of mines or businesses that are generating electricity to get a better sense of how much electricity is being generated outside Eskom, he said. 

“At the moment, I don’t think it’s very meaningful,” De Beer said.

“I think most of the electricity comes from Eskom and the proper power stations.”

The agency expects to begin producing the expanded data within the next two years, he said.

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