DUoS Capacity Optimiser
Right-size agreed capacity to cut DUoS capacity charges and avoid exceeded-capacity penalties.
For energy consultants and operators reviewing existing HV and LV connections.
Try DUoS Capacity OptimiserReduce to 1,660 kVA
recommended vs current 2,500 kVA · East Midlands HV
saved over 3 years, 33.6% lower
Sensitivity sweep · 2025-26
| Agreed kVA | Annual cost | Covers peak? |
|---|---|---|
| 1,500 | £6,900 | No |
| 1,600 | £7,360 | Yes |
| 1,660 · Recommended | £7,640 | Yes |
| 2,000 | £9,200 | Yes |
| 2,500 · Current | £11,500 | Yes |
Annual saving · 3-year path
The journey
Four steps, one optimisation
From MPAN and measured peak to the right kVA, with three years of savings quantified.
Enter
Enter MPAN and capacity details
Type the MPAN, current agreed capacity and measured peak demand. Toggle between kVA and kW. A safety margin (default 5.0%) keeps buffer above your peak to guard against future spikes.
Identify
Identify current cost and surplus
We decode the MPAN to confirm DNO region, tariff and capacity rate, then calculate your current annual DUoS capacity cost. Any surplus above your measured peak is flagged straight away.
Sweep
Sweep the capacity range
Annual cost at every kVA point from below your measured peak to above your current agreed capacity. Each row is flagged for whether it still covers your peak, keeping the exceeded-capacity risk visible at a glance.
Capacity sensitivity · 2025-26 · East Midlands HV HH
| Agreed kVA | Annual cost | Covers peak? |
|---|---|---|
| 1,400 | £6,440 | No |
| 1,500 | £6,900 | No |
| 1,600 | £7,360 | Yes |
| 1,660 · Recommended | £7,640 | Yes |
| 2,000 | £9,200 | Yes |
| 2,500 · Current | £11,500 | Yes |
Optimise
See the recommended kVA and savings
The recommended capacity sits just above your measured peak with a safety margin. Annual saving and cumulative 3-year saving are shown, with a year-by-year path to present to clients or DNO.
Reduce to 1,660 kVA
recommended vs current 2,500 kVA · East Midlands HV
saved over 3 years, 33.6% lower
Sensitivity sweep · 2025-26
| Agreed kVA | Annual cost | Covers peak? |
|---|---|---|
| 1,500 | £6,900 | No |
| 1,600 | £7,360 | Yes |
| 1,660 · Recommended | £7,640 | Yes |
| 2,000 | £9,200 | Yes |
| 2,500 · Current | £11,500 | Yes |
Annual saving · 3-year path
The problem
Your clients are probably mis-sized on agreed capacity
DUoS capacity charges are based on agreed capacity, not actual usage. Many businesses hold an agreed capacity set years ago that far exceeds their real peak demand, and others sit under-sized and quietly rack up exceeded-capacity penalties.
Without checking agreed capacity against measured peak demand, your clients either pay for headroom they never use or absorb premium exceeded-capacity charges every month.
Why it matters
What you walk away with
Current vs Recommended Capacity Comparison
See exactly what agreed capacity you should hold based on measured peak, with clear annual cost figures.
Target Capacity Recommendation
Get a recommended kVA value that maintains a safety margin above measured peak demand.
Capacity Sensitivity Analysis
See annual cost at a range of agreed capacities, with each option flagged for whether it still covers peak.
3-Year Savings Projection
See cumulative savings over 3 years with year-by-year breakdown - perfect for client proposals.
Built on official published rates
FAQ
Answers, before you ask
DUoS capacity charges are a fixed daily charge per kVA of agreed capacity. Many sites have an agreed capacity set years ago that is much higher than their actual peak demand, meaning they pay for headroom they never use.
Still curious? Email [email protected]
Right-size capacity. Cut the charge.
See the exact kVA to request from your DNO, with 3-year savings quantified.