Release Notes

Compare your current DUoS charges to what you'll pay after MHHS migration. See a side-by-side breakdown of charges under your aggregated tariff versus the site-specific tariff you'll move to post-migration.

Your Grid Supply Point group now displays alongside DNO region (e.g., "Eastern (UKPN) · GSP Group A"). GSP groups determine which profile coefficients apply to your meter.

New collapsible section showing when Red, Amber, and Green charging periods apply. See weekday vs weekend schedules with duration for each band.

Compare HV Metered, LV Sub-station, and LV Metered connection options side-by-side. Enter your DNO region, capacity (kVA), and estimated annual consumption to see which metering configuration offers the lowest DUoS charges. Includes optional site reference for tracking multiple analyses.

Modes are now grouped into two sections: "Network Charge Tools" for bill validation, forecasting, and EHV lookup, and "Settlement & Migration" for MHHS reference and readiness tools.

Two-column layout for Meter Code and Settlement Config in calculator mode; full-width Settlement Config in MHHS mode for better TPR visibility.

New calculator mode for the MHHS transition. Look up any 4-digit SSC code to see TPR configuration, settlement periods, and valid profile classes. MHHS-format MPANs display full SSC metadata including description, type, and TPR details.

Calculate AAHEDC charges using official rates published by NESO. This levy applies to all GB electricity consumption (domestic and non-domestic) with no exemptions. Rates seeded from 2022-23 through 2025-26.

Billing periods spanning April 1st are automatically split and prorated by days, applying the correct rate for each charging year segment.

New /api/v1/rates/aahedc endpoint provides programmatic access to AAHEDC rates with API key authentication, filtering by charging year or date, and pagination support.

Budget Forecast mode now includes TNUoS tariff data through 2030-31. Using NESO's official 5-Year View report, we've added 180 rate records covering all 14 TNUoS zones and 22 TDR bands for charging years 2026-27 through 2030-31.

Homepage counter animation now completes in 1 second instead of 2, with all subsequent elements appearing sooner for a snappier experience.

Consistent action bar across all calculator modes (Review Past Bills, Budget Forecast, MHHS Reference) with email, print, and new calculation options.

Fixed MHHS Reference mode to properly handle 21-digit legacy MPANs, now displaying MTC description, meter type, and time pattern information.

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.