Why battery storage is becoming a business asset rather than backup infrastructure
South African commercial and industrial businesses are changing the way they invest in battery storage. While loadshedding originally drove adoption, today’s investment decisions are increasingly being shaped by economics rather than resilience. Improvements in battery technology, rising electricity tariffs, more sophisticated energy management and new financing models are changing the role of battery storage from emergency backup to an actively managed commercial asset.
“Vastly improved battery technology, relentless electricity tariff increases and record-high diesel costs due to the Middle East conflict are among the developments driving a more strategic approach to energy among South African commercial and industrial (C&I) businesses,” says Annika di Bona, Senior Project Development Engineer at Candi Solar.
“We are seeing growing demand from businesses across multiple sectors, from manufacturing to agriculture to cold chains and distribution, to implement solar PV and battery solutions and to maximise the value and flexibility of existing solar investments.”
When Backup Power Becomes a Business Liability
Loadshedding made businesses heavily reliant on generators. But what started as emergency infrastructure has become a chronic and unaffordable operating cost.
Diesel prices are surging – up 35.4% month-on-month at one point, the largest increase this century! – making the true cost of running a generator between R8.50 and R11.00 per kWh, once servicing, fuel logistics and depreciation are factored in.
For a medium-sized industrial facility with a 350 kVA to 500 kVA grid connection, running on a generator for as little as 40 hours per month, diesel costs can total between R100,000 and R180,000 per month. That’s double what would have been spent on grid electricity.
The sectors most exposed are those where uptime is non-negotiable: manufacturing, cold storage, agriculture and dairies are bearing the brunt.
“Relying on the grid and generators alone is no longer viable for businesses focused on cost savings, operational resilience, return on investment and long-term competitiveness,” notes di Bona.
Next Level: Strategic Energy Cost Management
Instead, businesses are moving from surviving power outages to proactively optimising energy costs. In practice, this means increasingly using a combination of solar PV, battery storage and grid electricity as part of a broader operational energy management strategy.
This is made possible due to advancements in battery storage, also known as Battery Energy Storage Systems or BESS, as well as two key industry factors: BESS systems are now easy to fit or retrofit onto existing infrastructure, and structured financing options are becoming more widely available.
The Shift to Solar + Battery
Many businesses are moving to solar PV to reduce both grid and diesel dependence. These systems have matured substantially over the last decade, PV panel output is now guaranteed for up to 30 years with leading brands.
However, the real evolution happens when batteries are added. This is because battery storage is no longer just backup infrastructure, it has become a cost-management tool and a dynamic asset engineered to use energy data, reduce peak demand penalties and generate predictable, long-term savings that go straight back to the bottom line.
As a result of the financial leverage that batteries unlock, lower hardware costs and tax incentives, solar payback periods have dropped from up to 10 years historically to just 2–3 years today.
Di Bona adds that battery solutions, some now guaranteed for up to 10 years, can be tailored to operational priorities, with some businesses requiring full-site backup capabilities while others focus specifically on protecting critical production systems and operational infrastructure.
Either way, by adding the crucial factor of a stable power supply, solar-and-storage systems have become a non-negotiable for running a sustainable business in South Africa, hedging businesses against rising diesel costs, coal shortages, political unrest and other factors that influence the price of power.
Double the Value of Battery Storage
However, battery storage and solar are used not only for resilience, but also to actively reduce energy costs. Through active energy management strategies such as energy arbitrage and peak shaving, returns from solar investments have skyrocketed.
Businesses are increasingly using battery energy storage systems (BESS) to store cheaper energy for use during expensive peak tariff periods, a strategy known as energy arbitrage. By charging batteries during cheap off-peak periods and discharging during expensive peak-tariff windows, businesses can cut peak electricity costs significantly. Under Time-of-Use tariffs, the peak-to-off-peak difference can exceed R7/kWh in winter.
For businesses with existing solar PV installations, adding battery storage transforms a static daytime asset into an around-the-clock cost-management tool.
Batteries also facilitate peak shaving to tackle Maximum Demand penalties, which can make up 30–50% of an industrial power bill, by instantly injecting stored power when demand spikes.
Smoothing The Shift
In addition to the financial advantage, there are two important factors that are smoothing the shift: businesses don’t need to start from scratch, and finance is becoming more easily accessible.
Modern modular battery retrofits can be added to existing grid-tied solar installations with virtually zero operational downtime and easily interface with pre-existing inverters and switchboard infrastructure. This merges both generation and storage data into a single energy management platform, transforming a static daytime asset into an around-the-clock energy management tool.
In addition, while the upfront cost of BESS has historically been the main barrier to entry for most businesses, structured financing (PPAs, leases, per-kWh billing models) is now making adoption increasingly accessible.
“The acceleration of BESS financing marks a fundamental shift in how South African industries think about energy infrastructure,” says Di Bona. “Financing through a bank is one option, but businesses are increasingly recognising the value of outsourcing the engineering and lifecycle management of these complex systems to a specialist. Energy partners such as Candi Solar not only design storage systems that account for all operational requirements, but also maintain the asset and ensure its performance across its full lifecycle.”
Future-ready
C&I businesses shifting to broader energy portfolio management strategies that combine solar PV, battery storage, grid optimisation and reduced diesel dependence, are also ideally positioned to benefit from further industry technologies and developments.
“For example, there is also a clear industry shift towards wheeling and virtual power plants, with innovative private-sector players developing strategies for businesses to capitalise on their excess solar power by selling it to neighbouring operations at rates that are attractive to both parties.
“Similarly, with the integration of AI into energy management strategies and active energy control, energy price hikes and supply unpredictability will soon cease to be a limiting factor for the South African C&I sector,” says Di Bona.
“Businesses that start approaching energy more strategically now are likely to place themselves in a far stronger competitive position over the long term.”
