Jun 13, 2019

Solar Power: an end to load shedding in South Africa?

4 min
Solar technology in South Africa
For residents and businesses in S...

For residents and businesses in South Africa, Eskom has long been a source of frustration. Generating approximately 95% of the country’s electricity, the company holds a state-supported monopoly on the energy supply in South Africa – where rolling blackouts are a daily occurrence as the national grid falters. 

Load shedding has been a part of South African life since 2014 when it first became clear Eskom could not keep up with post-apartheid demand – and unfortunately, it seems it is here to stay. Minister of public enterprises, Pravin Gordhan, has previously said the government and Eskom are determined not to go beyond Stage 4 load shedding (where 4,000MW has to be shed in). But now, it is clear that plans have been laid for Stage 5 (5,000MW) and Stage 6 (6,000MW) load shedding schedules, which would mean even longer periods of power outages for residents and businesses.

Officials have warned there is a race against time to ensure a national blackout and grid collapse – like those which have crippled Venezuela – do not happen in South Africa. Gordhan said: “We don’t want to remain in a vicious cycle where load shedding shifts to other crises. We are committed to rebuilding the energy supply and energy confidence”.

What’s the solution?

Almost 70% of South Africa’s energy is currently generated by coal, whilst solar and wind combined only make up 0.1% of the national energy supply. However, many of the country’s ageing coal power stations are up to 50 years old – despite stations normally only producing sufficient electricity for 30 years, according to Eskom board chair Jabu Mabuza.

Gordhan has also admitted that Eskom’s two newest coal plants were“badly designed and badly constructed”, with many sources claiming they are only 40% reliable. As a result, the South African grid simply can’t cope with demand.

Opening up the market for Independent Power Producers would help significantly plug power capacity shortages, as competition would provide greater incentives to maintain and develop new energy systems. Unfortunately, the government is unlikely to take this action anytime soon – so residents and businesses need to prepare for the worst.

One thing South Africa isn’t short on is sunshine, which is why solar power could provide a sustainable solution to counteract the Eskom problem. A solar photovoltaic (PV) system can provide up to 30% of an average home’s energy, for example. As such, many South African home and business owners are looking to solar. Although they can be expensive to install, the cost of solar PV systems has fallen dramatically – making them a hugely beneficial long-term investment.

Choosing the right Solar PV system

The principle of yielding electricity from the sun remains the same but there are many ways a PV installation can be connected to best suit both homeowners and businesses. There are five different types of solar PV systems: grid-tied, grid-backup, enhanced self-consumption, peak-shaving and off-grid. 

A pure grid-tied system with no storage or load management is a viable option for South Africa as a nation which experiences steep energy price hikes year on year but does not provide power in the event of a blackout. Instead, there will be continued demand for grid-backup systems – which use a battery to store power and can operate with no grid for prolonged periods of time – if frequent load shedding, or even fear of it, continues.

Enhanced self-consumption where surplus energy is stored and used to heat water could also provide a cost-effective solution. The storage option may take the form of a battery system instead; however, this could add significantly to the cost and would have a long financial payback time at current electricity prices.

Many energy users in South Africa pay a high tariff when using greater amounts of electricity than normal during peak times. A PV system can also be used to limit the amount of higher-cost electricity consumed by storing energy during the hours of sunlight and releasing it during the high-cost periods – this is known as peak-shaving.

Finally, there is an off-grid system which requires significant investment including a large capacity battery and an inverter capable of supplying the maximum load. Operating totally off grid cannot normally be justified if there is a good-quality grid connection available but if South Africa continues down its current route it may become a viable option in the future.

Fitting a solar system is complicated and requires a knowledgeable distributor and expert installers who can advise on the most suitable system to meet the customer’s requirements. SegenSolar’s unique portal is a crucial tool for installers looking to fit a solar PV system onto their customers’ homes or office buildings to provide power in the event of a grid failure or load shedding.

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May 5, 2021

AES Corp seals 10-year carbon-free energy deal with Google

Dominic Ellis
3 min
AES Corporation will ensure energy powering Google's Virginia data centers will be '90% carbon free'

The AES Corporation has struck a 10-year supply contract with Google to provide near-carbon-free energy to power its Virginia-based data centers which will start later this year.

Claiming the first clean energy procurement deal in the world of its kind, AES will help ensure that the energy powering those data centers will be 90% carbon-free when measured on an hourly basis.

AES will become the sole supplier of the data centers' carbon-free energy needs on an annual basis, sourcing energy from a portfolio of wind, solar, hydro and battery storage resources to be developed or contracted by AES.

The agreement marks an important step in meeting Google's previously announced goal to run its business on 100% carbon-free energy on an hourly basis by 2030.

"Last year, Google set an ambitious sustainability goal of committing to 100% 24/7 carbon-free energy by 2030. Today, we are proud that through our collaboration with Google, we are making 24/7 carbon-free energy a reality for their data centers in Virginia," said Andrés Gluski, AES President and CEO. "This first-of-its-kind solution, which we co-created with Google, will set a new sustainability standard for companies and organizations seeking to eliminate carbon from their energy supply."

"Not only is this partnership with AES an important step towards achieving Google's 24/7 carbon-free energy goal, it also lays a blueprint for other companies looking to decarbonize their own operations," says Michael Terrell, Director of Energy at Google. "Our hope is that this model can be replicated to accelerate the clean energy transition, both for companies and, eventually, for power grids." 

AES assembled the 500MW portfolio from a combination of AES' own renewable energy projects and those of third-party developers, which were selected, sized and contracted to meet Google's energy needs across a number of considerations, including cost efficiency, additionality and carbon-free energy profile.

The portfolio assembled by AES is expected to require approximately $600 million of investment and generate 1,200 jobs, both permanent and construction, in the host communities. These efforts will greatly simplify Google's energy procurement and management at a competitive price while decarbonizing Google's load and the broader PJM grid.

This supply agreement follows on the strategic alliance AES and Google formed in November 2019 to leverage Google Cloud technology to accelerate innovation in energy distribution and management and advance the adoption of clean energy. AES is pioneering greener, smarter energy innovations, with the goal of expanding the services available to large-scale corporate customers.

The Google.org Impact Challenge on Climate commits €10M to fund bold ideas that aim to use technology to accelerate Europe’s progress toward a greener, more resilient future. Selected organisations may receive up to €2M in funding and possible customised post-grant support from the Google for Startups Accelerator to help bring their ideas to life.

Last year it issued $5.75 billion in sustainability bonds to fund ongoing and new environmentally or socially responsible projects. To read its 2020 Environment report, click here.

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