The proposed integration of renewable power, battery storage and electrolyzers could help repurpose Sasolburg for lower-carbon fuels and chemicals, linking South Africa’s established industrial infrastructure with its emerging green energy economy.
In early August, Johannesburg-based Sasol commissioned Envision Energy to conduct an engineering design study for a potential green hydrogen system at its Sasolburg operations, opening a pathway to repurpose one of South Africa’s established fossil-fuel industrial sites for lower-carbon fuels and chemicals.
The collaboration was highlighted during a visit by South Africa’s Minister of Electricity and Energy to Envision’s Chifeng Hydrogen Net Zero Industrial Park in Inner Mongolia, as part of the South Africa-China Energy Investment Conference.
The study will assess how renewable power generation, battery energy storage systems (BESS) and electrolyzers can be integrated to produce cost-competitive green hydrogen. Expected to conclude later this year, it is intended to provide Sasol with the technical and commercial basis for evaluating potential investment and subsequent project development.
For Sasol, the opportunity extends beyond hydrogen production. The company is evaluating whether green hydrogen could support the production of e-methanol and potentially e-SAF, allowing it to leverage existing industrial capabilities and infrastructure while developing new lower-carbon product markets.
Sasol is a vertically integrated chemicals and energy company and one of South Africa’s largest industrial groups. Founded in 1950, it operates across Southern Africa Energy & Chemicals and International Chemicals. Its industrial heritage is rooted in the commercialization of coal-to-liquids (CTL) and gas-to-liquids (GTL) technologies, using the Fischer-Tropsch process to convert coal and natural gas into synthetic fuels and chemical feedstocks.
Designing around variable renewable power
Green hydrogen production requires renewable electricity for electrolysis, making project economics highly sensitive to power availability, electrolyzer utilization and system integration. Variable solar and wind generation also presents an operational challenge for electrolyzers and downstream processes.
Envision’s study will therefore assess renewable generation, BESS and electrolyzers as an integrated system, supported by AI-enabled energy management software designed to optimize operations based on weather forecasts, power availability and electricity prices. Advanced forecasting and control systems could help balance renewable utilization, electrolyzer operating hours and overall system costs.
A key output will be the optimal configuration of renewable generation, storage and electrolyzer capacity under local resource, grid and market conditions. The design will need to balance capital intensity against electrolyzer utilization and the delivered cost of electricity to the hydrogen system.
This is particularly relevant to Sasol’s broader energy transition strategy. The company aims to deploy more than 2 GW of wind and solar capacity by 2030, reducing its reliance on South Africa’s coal-intensive electricity system while increasing access to renewable power for its industrial operations.
Envision brings experience integrating renewable generation, storage and hydrogen systems at scale, including its Chifeng hydrogen and net-zero industrial operations in Inner Mongolia. That experience provides a relevant reference point as Sasol evaluates the technical and economic viability of an integrated system at Sasolburg.
From hydrogen to higher-value products
The potential commercial case lies primarily in the downstream value chain. Sasol is exploring green hydrogen as a feedstock for lower-carbon fuels and chemicals, including e-methanol and e-SAF.
E-methanol combines hydrogen with a carbon source, such as captured carbon dioxide, and can serve chemical markets as well as emerging lower-carbon marine-fuel applications. E-SAF addresses a more difficult decarbonization challenge: aviation has limited near-term alternatives to energy-dense liquid fuels, making scalable lower-carbon pathways strategically important.
This creates a potential value chain in which renewable electricity is converted into hydrogen and subsequently into higher-value fuels and chemicals. Sasol could leverage its existing processing infrastructure, engineering expertise and commercial relationships to support downstream production.
The economics will depend on multiple factors, including renewable power costs, electrolyzer capital expenditure and utilization, storage requirements, water availability, financing costs, carbon management costs, and the price premium available for certified lower-carbon products.
The design study is therefore an important step before any final investment decision. It will allow Sasol to establish a technically viable configuration and assess whether the resulting hydrogen and downstream products can meet commercial requirements before committing significant capital.
China’s coal-to-chemicals transition: A relevant parallel
The Sasolburg initiative comes at a time when China is increasingly exploring how renewable power and green hydrogen can be integrated into industries historically dependent on coal and other fossil feedstocks.
On August 10, China’s National Development and Reform Commission (NDRC) and National Energy Administration (NEA) issued the 15th Five-Year Plan for the Development of the Coal Industry. The plan encourages the deployment of green electricity and green hydrogen in coal-to-oil and coal-to-gas projects, as well as coal-chemical projects.
The policy direction is significant because it points toward a broader industrial transition model: rather than treating renewable energy and hydrogen solely as emerging industries, they can also be deployed to reduce the carbon intensity of existing industrial assets, processes and value chains.
Industry experts estimate that about 5,000 GW of renewable-energy capacity could, in principle, offset China’s oil imports. While this represents a long-term scenario rather than an immediately actionable target, it illustrates the strategic potential of using renewable electricity, green hydrogen and their derivatives to substitute for fossil fuels.
A test case for South Africa’s industrial transition
The project also has implications beyond Sasolburg. South Africa has significant solar and wind resources, but its industrial economy remains heavily dependent on carbon-intensive energy and processes. Green hydrogen could help convert renewable electricity into industrial feedstocks and exportable fuels, connecting the country’s renewable energy potential with its existing industrial base.
Sasolburg is well-suited to testing this model because it already has industrial infrastructure, technical capabilities and established chemical operations. Integrating renewable energy and hydrogen assets with those facilities could reduce the infrastructure requirements and execution risks associated with developing an entirely new green fuels complex.
The location could also provide access to growing international markets for lower‑carbon fuels. Demand for e‑methanol and SAF is increasingly driven by international shipping and aviation decarbonization policies. South Africa’s renewable resources could become a competitive advantage if projects achieve sufficiently low production costs while meeting increasingly stringent certification and emissions requirements.
From technology study to investment decision
For Envision, the Sasol collaboration provides an opportunity to deploy its integrated renewable energy, storage and hydrogen capabilities in a major industrial market outside China. For Sasol, it offers a structured mechanism to test technology, system design and economics before making a significant capital commitment.
The more consequential aspect is the integrated model. Renewable generation, storage, electrolysis and AI-based energy management are being evaluated as components of a single industrial energy system rather than as standalone technologies. Commercial viability will ultimately depend on how effectively these components operate together.
China’s policy direction adds another dimension. Its push to deploy renewable electricity and green hydrogen in coal and chemical industries highlights the potential of retrofitting existing industrial assets. For South Africa, Sasolburg could serve as a practical test case for a broader industrial-transition strategy.
The study is expected to provide the technical and commercial information required for Sasol’s next stage investment assessment. If it demonstrates a competitive pathway from renewable electricity to hydrogen and ultimately to e-methanol or e-SAF, Sasolburg could become an early example of how an established fossil-fuel industrial complex can be repositioned around renewable power and hydrogen.