In Parts 1 and 2 of this series, we explored the structure of South Africa’s electricity tariffs and how to interpret a typical bill. Now we shift gears to answer the question most financial and operational decision-makers in the commercial and industrial (C&I) space are really asking:
How do we reduce our electricity costs without disrupting operations?
The answer lies in a focused, multi-pronged approach to tariff optimisation. This article outlines the most effective and legally compliant strategies used by leading C&I firms to reduce their electricity spend—often by 10–30%—without significant infrastructure changes.
As electricity costs continue to rise, businesses in the commercial and industrial sectors are increasingly focused on finding effective strategies to reduce expenses without compromising operations. Tariff optimisation has emerged as a critical tool for decision-makers looking to align energy usage with more favorable cost structures imposed by Eskom or municipal suppliers. By strategically managing peak demand charges and employing power factor correction, businesses can significantly lower their electricity bills. Load shifting to off-peak hours and exploring the benefits of embedded generation also offer pathways to meaningful savings. In this article, we delve into these strategies and more, providing insights into how leading C&I firms are successfully managing their electricity costs. For a comprehensive guide on understanding your electricity bill, visit our detailed breakdown.
Understanding Tariff Optimisation
What Is Tariff Optimisation?
Tariff optimisation involves adjusting when, how, and how much electricity a business uses to align more favorably with the cost structure imposed by Eskom or municipal suppliers. This practice can include switching to a more suitable tariff, reducing peak demand charges, shifting energy use to off-peak hours, correcting poor power factor, and resizing contracted capacity. When combined with embedded generation or storage, these strategies can be even more effective in reducing electricity costs for commercial and industrial (C&I) businesses.
Key Strategies for Tariff Optimisation
Strategy 1: Tariff Type Review & Switch
Every business is placed on a default tariff based on size, voltage level, and geographic location. Staying on an outdated or misaligned tariff can result in unnecessary costs. To optimise your tariff, compare your usage profile with available tariff structures and recalculate your bill under alternative tariffs. For example, a logistics facility that moved from Urban Large to TOU Megaflex and shifted 30% of their load to off-peak might achieve a 17% reduction in energy charges.
Strategy 2: Peak Load Management
Most C&I tariffs include demand charges based on the highest 30-minute average consumption in the billing cycle. These charges can account for 20-40% of your total bill. To manage peak loads, identify equipment or processes that contribute to demand spikes, stagger heavy loads instead of simultaneous starts, use soft starters or variable-speed drives, and set internal alerts when demand approaches threshold. Implementing Energy Management Systems (EMS) can automate this process and further optimise peak load management.
Strategy 3: Load Shifting to Off-Peak
Time-of-use tariffs penalise peak-time usage. By shifting discretionary loads to standard or off-peak periods, you can unlock savings without reducing total consumption. Consider rescheduling operations like heating, ventilation, pumping, or refrigeration to off-peak hours. Run non-time-sensitive production overnight or over weekends, and align shift patterns with tariff windows. A textile plant that moved dyeing operations to off-peak hours reduced its average unit cost by 22.3%.
Advanced Optimisation Techniques
Strategy 4: Correcting Power Factor
If your site has inefficient power usage (typically below 0.9), you’re likely paying power factor penalties. These are relatively easy to correct. Install or maintain power factor correction (PFC) equipment, ensure capacitors are sized for current load, and include PFC in any expansion plans. One warehousing company eliminated a 6% surcharge by improving its power factor from 0.78 to 0.95.
Strategy 5: Resize Contracted Demand or NMD
Many businesses have Notified Maximum Demand (NMD) or contracted capacity levels set years ago, often higher than needed today. Compare actual demand to NMD over 12 months and request a reduction via your utility if appropriate. This requires a formal process and impact analysis. Avoid exceeding NMD to prevent punitive charges. A packaging plant adjusting its NMD down by 20% could save up to R180,000/year in avoided capacity charges.
Strategy 6: Embedded Generation (Solar + Storage)
While not strictly tariff-related, embedded generation allows businesses to offset expensive grid-supplied electricity, especially during peak TOU periods. Size solar PV to meet your off-peak or shoulder load, use batteries to shave peak demand or provide backup, and align embedded system outputs with tariff window logic. Ensure compliance with NERSA registration, grid-code, and your supplier’s embedded generation policy.
Ensuring Accuracy and Compliance
Strategy 7: Bill Auditing & Dispute Resolution
Municipal and Eskom billing systems are not perfect. Inaccuracies, duplicate charges, or tariff misapplications are surprisingly common. Review bills against historical usage trends, compare line items with published tariff booklets, conduct third-party audits, and submit formal disputes where necessary. Municipal errors can often be reversed up to 36 months back if challenged with supporting evidence.
Conclusion
Electricity tariffs are not just overhead; they’re a lever for margin improvement. Forward-thinking CFOs and operations executives are using this insight to improve EBITDA without increasing sales, free up working capital, and support ESG goals and energy resilience. By implementing these strategies, businesses in the C&I sector can significantly reduce their electricity costs and gain a competitive advantage in their respective markets.
Look out for Part 4, we’ll explore how to forecast electricity costs and design bankable business cases for energy investments (solar, batteries, EMS) using your tariff data.
Need Expert Guidance?
Hammer & Anvil Energy offers tariff audits, load studies, bill analysis, and embedded generation advisory tailored to C&I businesses across South Africa. To book a free consultation:
Email us at energy@hammer-and-anvil
Visit energy.hammerandanvil.co.za
