Capacity Optimiser
Right-size agreed capacity against measured peak. One kVA change, priced on the DUoS capacity charge, with the TNUoS TDR band you hold to 2031 shown beside it.
For energy consultants and operators reviewing existing HV and LV connections.
Try Capacity OptimiserSave £35,036 over 3 years
Right-size your agreed capacity to 420 kVA
Distribution
£60,408 → £25,371
Transmission
HV Band 2, held to 31 March 2031
Capacity options
Cost at a range of agreed capacities
Savings
Distribution and transmission combined
Assumptions & Methodology
Data sources and calculation methods
The journey
Four steps, one kVA figure
From MPAN and measured peak to one recommended capacity, with the distribution savings year by year and the transmission band the site holds to March 2031.
Enter
Enter capacity and peak
Your MPAN sets the voltage level, so the tile is already fixed to what we decoded. Add the agreed capacity from your connection agreement and your highest measured demand over the last twelve months, in kVA or kW. A 5.0% safety margin above the peak is applied by default.
Low Voltage
Up to 1kV
High Voltage
1kV to 22kV
Extra High Voltage
22kV and above
Set from your MPAN: High Voltage
Distribution
Price the distribution leg
The DUoS capacity charge is your agreed kVA at the DNO capacity rate, every day of the year. Current and recommended sit side by side at the published rate, then the year table shows what each costs across every charging year we hold rates for.
Distribution
£60,408 → £25,371
Current capacity
- Capacity
- 1,000 kVA
- Daily Rate
- 5.31p/kVA/day
Recommended capacity
- Capacity
- 420 kVA
- Daily Rate
- 5.31p/kVA/day
| Year | Current | Recommended | Saving |
|---|---|---|---|
| 2026-27 | £19,382 | £8,140 | £11,241 |
| 2027-28 | £20,440 | £8,585 | £11,855 |
| 2028-29 | £20,586 | £8,646 | £11,940 |
| Total | £60,408 | £25,371 | £35,036 |
Transmission
Check the TNUoS band
The same kVA sets your TNUoS demand residual band, but only when the band is allocated, and that allocation holds for the whole price control. The panel names the band you are in, what it costs each year to March 2031, and the January 2029 measurement that sets the next one.
Transmission
HV Band 2, held to 31 March 2031
Band held
HV Band 2
- Capacity
- 1,000 kVA
- Daily Rate
- £117.15/day
- Band Range
- 500 - 1,100 kVA
Next allocation
RIIO-4
- Capacity measured
- January 2029
- Capacity held
- 420 kVA
- Band Range
- Not yet published
| Year | Band | Annual charge |
|---|---|---|
| 2026-27 | HV Band 2 | £42,761 |
| 2027-28 | HV Band 2 | £52,933 |
| 2028-29 | HV Band 2 | £75,052 |
| Total | £170,745 |
Total
See the savings
One table carries the distribution savings year by year, and the tabs move every figure on the page to that charging year. The transmission column stays at zero until the next allocation: the DUoS savings apply once your DNO registers the new capacity, while the band you hold runs to 31 March 2031.
Savings
Distribution and transmission combined
| Year | Distribution | Transmission | Total saving |
|---|---|---|---|
| 2026-27 | £11,241 | £0 | £11,241 |
| 2027-28 | £11,855 | £0 | £11,855 |
| 2028-29 | £11,940 | £0 | £11,940 |
| Total | £35,036 | £0 | £35,036 |
Assumptions & Methodology
Data sources and calculation methods
The problem
An oversized kVA figure costs you every day, and sets your band for five years
Agreed capacity drives the DUoS capacity charge every day, and the TNUoS TDR band at each allocation. Most sites hold a figure set years ago that sits well above their real peak, and some sit under it and pay exceeded-capacity penalties instead.
Leave it and you pay the distribution charge on kVA you never draw, then carry the same figure into the January 2029 measurement that fixes your band for the next price control.
See the band you hold, and the one below it
Decode the MPAN, put in your agreed capacity and measured peak, and the tool prices both charges that capacity drives. Every band is costed, with the kVA change needed to reach each one.
- DUoS and TNUoS together
- Every band priced
- The kVA change to reach each
- Three year view
Why it matters
What you walk away with
Annual Savings, Year by Year
One annual figure for the capacity change on the DUoS capacity charge, with a row per charging year, so a client can see what the variation is worth before asking the DNO for it.
Target Capacity Recommendation
A recommended kVA that keeps a safety margin above measured peak, priced on the DUoS capacity charge and carried into the next band allocation.
Band Position and Thresholds
The TDR band the site holds until 31 March 2031, the kVA thresholds either side, and the January 2029 measurement that sets the next allocation.
Capacity options
Annual DUoS capacity cost at a range of agreed capacities, each option flagged for whether it still covers peak.
Built on official published rates
FAQ
Answers, before you ask
In the current price control, one. The DNO charges a daily DUoS capacity charge per kVA of agreed capacity, and a cut reduces it in proportion from the date the DNO registers the new figure. The TNUoS Transmission Demand Residual sits in a band allocated from the same kVA, but that band is fixed for the whole price control period. RIIO-3 bands run to 31 March 2031, so the band stays put when the capacity changes.
Still curious? Email hello@energycode.ai
Right-size capacity. Price the savings, check the band.
See the exact kVA to request from your DNO, what it saves on distribution, and the TDR band you hold until March 2031.