Release Notes

New calculator mode to analyse whether your agreed capacity (MIC) is oversized. Enter your MPAN or manually specify voltage level, MIC, and maximum demand to see if you could save by moving to a lower TDR band.

Toggle between annual view and 3-year total to see cumulative savings opportunity. Year-by-year breakdown accordion shows exactly how costs compare each charging year.

Get a recommended MIC value that maintains a safe margin above your peak demand while moving you to the optimal TDR band.

For EHV sites, see warnings about threshold changes in April 2026 that could affect your band - helping you plan ahead for RIIO-3.

New calculator mode for energy consultancies to model DUoS savings from load shifting. Enter your MPAN and consumption, then use interactive sliders to explore how moving demand between Red, Amber, and Green time bands affects your annual costs.

Intuitive R/A/G sliders that maintain 100% total consumption. Reduce Red and the reduction cascades to Amber; reduce Amber and it flows to Green. See your potential savings update in real-time as you drag.

Don't know your R/A/G split? Enter your total annual consumption and we'll estimate the split using D0018 profile coefficients for your meter's profile class, or time band hours for half-hourly meters.

Clear before/after comparison showing baseline costs vs shifted costs. See exactly how much you could save per year by optimising when you use electricity.

Enter a generation MPAN and the calculator automatically detects it from your LLFC. The interface adapts to show "Export kWh" instead of "Usage kWh" and displays DUoS credits (negative rates) with green styling.

All 8 CDCM generation tariff categories are now supported (LV_GEN_AGG, LVS_GEN_AGG, LV_GEN_SS, etc.). Generation tariffs have negative unit rates, meaning embedded generators receive credits for the electricity they export to the grid.

Embedded generators can calculate their EET credits by entering their Maximum Export Capacity (MEC). EET is a credit paid annually based on your connection capacity, calculated as MEC × EET rate × billing days.

Generation MPANs work in Budget Forecast mode too. See how your export credits will change year-over-year using published future rates.

TNUoS capacity inputs (MIC, voltage level) now only appear for half-hourly customers who need them. Non-half-hourly customers (Profile Classes 01-04) no longer see these fields since their TDR band is determined automatically from annual consumption.

Non-half-hourly demand calculations now complete in ~4.5 seconds, down from 30+ seconds. Fixed an N+1 query issue with BST transition lookups.

The Customise Test MPAN modal now includes a Demand/Generation toggle. Select "Generation" to generate test MPANs for export meters, making it easier to explore how embedded generation credits work.

Budget Forecast now correctly includes negative charges (credits) in the year-over-year comparison summary.

Predict future electricity costs using rates published 12-18 months in advance. Compare current vs future charges side-by-side for DUoS, TNUoS, BSUoS, CCL, CfD, and Capacity Market.

CCL is now available alongside DUoS, TNUoS, BSUoS, CfD, and Capacity Market charges for non-domestic customers.

Cleaner interface when your billing period crosses April 1st, with better mobile layout and consistent design across both calculator modes.

New segmented S-Box Grid layout that mirrors how meter numbers appear on bills. Each segment (PC, MTC, LLFC, DNO, Unique ID, Check digits) has its own input field with color-coding for easier data entry. You can now edit individual segments without retyping the whole MPAN.

Fixed cold start delays that could cause slow responses, especially first thing in the morning. The calculator now responds faster.

Calculation result emails now display correctly in Outlook desktop, with proper header styling.

Fixed an issue where billing periods spanning two charging years (e.g., March to April) would show a validation error even when all consumption data was entered correctly.

The "Generate Test MPAN" button now works reliably every time. Previously, random generation could intermittently fail with no feedback to the user. The generator now uses pre-validated meter configurations, and the warming system has been hardened to prevent cascading failures.

Fixed recognition of MPANs where LLFC codes appear without leading zeros on bills (e.g., "1" instead of "001"). The calculator now automatically pads these codes correctly when you paste 19-20 digit MPANs. Visual feedback shows when auto-padding has been applied.

A comprehensive knowledge hub covering everything from meter numbers (MPAN) to network charges (DUoS, TNUoS, BSUoS) to industry reforms (MHHS, TCR, CDCM). Essential reference for TPIs and energy professionals.

Instantly search all glossary terms from the Learn page. Press Cmd+K (Mac) or Ctrl+K (Windows/Linux) to open the search palette and find definitions in seconds.

Share links to specific terms using hash URLs (e.g., /learn#mpan or /learn#duos). Perfect for documentation, training materials, or answering client questions.

The MPAN decoder now correctly displays "SSC (Standard Settlement Configuration)" for MHHS-format MPANs, ensuring accurate terminology for energy professionals.

The calculator now clearly asks for all 21 or 22 digits from your electricity bill, with a help icon explaining where to find both rows of numbers in the "S" box. This prevents incomplete MPANs being entered (the 13-digit "Supply Number" alone is not enough to determine your tariff).

Fixed an issue with MPAN validation to ensure all valid meter numbers are correctly accepted.

MPANs with alphanumeric characters in the LLFC position (e.g., A01, P80, N35) are now correctly accepted.

Previously, charges you had deselected (like TNUoS or BSUoS) would still appear in your calculation results and email summaries. Now, only the charges you select are calculated and included in your results and emails.

The calculator now automatically hides input fields for charges you haven't selected. For example, if you deselect TNUoS, the "Triad Demand" field will no longer appear, creating a cleaner and more focused form.

Penalty charges when maximum demand exceeds your agreed capacity are now displayed in the DUoS breakdown, helping you identify unexpected capacity-related costs.

Charges for poor power factor are now displayed in the DUoS breakdown, giving you visibility into power quality penalties.

Removed the visual step indicator to create a cleaner, more focused experience that works better across all devices.

Tap FROM or TO dates on mobile to jump directly to the right calendar month - making it faster to select billing periods on your phone or tablet.