BAMML Executive Insights
Energy Cost Has Quietly Become a Labour Productivity Problem
Ask a South African manufacturer what energy has done to their business over recent years and you will get a cost answer. Tariffs, generator diesel, the capital spent on alternative supply.
Ask what it has done to their shift pattern and you get a longer pause — because most manufacturers have changed how and when they run, and very few have costed what that change did to labour.
What is actually happening
Faced with rising and less predictable energy costs, manufacturers respond rationally. Move energy-intensive work to cheaper periods. Compress runs. Change shift start times. Add a night shift. Use weekends differently. Run the generator when the alternative is stopping.
Each of those decisions is made on an energy basis, and each has a labour consequence that lands in a different budget.
Night and weekend work carries premiums. Compressed runs concentrate demand for supervision and maintenance into narrower windows. Changed patterns disturb established shift arrangements, which are often collectively agreed and cannot simply be varied. Extended or irregular hours accumulate fatigue, and fatigue shows up as absence, error rate and incidents.
The energy saving is calculated and reported. The labour consequence is absorbed into payroll variance, overtime, absence and, eventually, throughput — where it is attributed to other things entirely.
Why it matters
The result is that many manufacturers do not know their true unit cost after the energy response.
They know the tariff. They know the payroll. What they do not have is a figure that combines them at the level where the decision was made — this product, on this line, under this shift pattern, at this time of day.
Without that, two errors become likely.
The first is optimising energy at the expense of everything else. A shift pattern that reduces the energy bill but raises premiums, lowers output per hour and increases absence can be a net loss that still looks like a saving in the utilities line.
The second is misdiagnosing the productivity decline that follows. Output per hour falls, and the investigation looks at the workforce — supervision, discipline, motivation — because that is where the symptom appeared. The cause was a scheduling decision made in a different meeting for a different reason.
The Integrated View
| Discipline | What it sees | What it misses alone |
|---|---|---|
| Operational Performance | Throughput and schedule adherence | That the schedule was set by energy cost, not by productivity |
| Financial Governance | Energy cost down, payroll up | That these two movements are the same decision |
| Workforce Governance | Premiums, fatigue, absence, IR consultation on changed patterns | That the driver was never a workforce decision |
| Risk & Compliance | Hours of work, rest periods, collective agreements | That an operational response may have created a compliance issue |
| Executive Decision Intelligence | Separate utilities and payroll reporting | A combined unit cost — which nobody produces |
The missing item is a single number: cost per unit produced, by shift pattern, including energy and labour together. Most manufacturers cannot produce it, and it is usually the number that would settle the argument.
What good looks like
Cost the shift pattern as a whole before changing it. Energy saved, premiums added, expected output per hour, supervision and maintenance cover, and the absence rate you would expect at that intensity. One number, not two departments' numbers.
Consult properly and early where patterns are changing. Shift arrangements are frequently governed by agreement. An operational response that varies them unilaterally can convert an energy decision into a labour dispute, which is an expensive way to save on electricity.
Then monitor the combined figure rather than its components. If energy cost per unit falls while total cost per unit rises, you want to find that out in the month it happens — not in the annual results, by which time the pattern has been normal for three quarters.
What to do on Monday
- Write down the current shift pattern and when it last changed. Then write down why it changed. If the reason was energy, this article is about you.
- Calculate cost per unit under the current pattern, including energy and all labour premiums. If nobody can produce it, that is the finding.
- Compare it to the pattern you ran before the change. Same calculation, same basis.
- Check absence and overtime since the change. Both are lagging indicators of a pattern that is harder to work than the old one.
- Confirm the changed pattern is properly agreed and that hours and rest provisions are being met.
The question is not whether to respond to energy cost. It is whether the response is being measured on one dimension while it acts on three.
