Data quality

Accuracy, caveats, and method notes.

A transparent view of our sources, assumptions, and the limits of every chart.

Source-first Caveat-aware Best-effort feeds

Data quality

Accuracy, caveats, and your own checks

We ingest public BMRS and other free feeds on a best-effort basis. Outages, late publications, and schema quirks can lead to partial days or missing prices.

Use this data at your own risk. For critical decisions, please verify against the original sources (BMRS, ESO, etc.).

If you spot anomalies, please check the source data directly and let us know.

Method library

Methods & assumptions by page

Each block mirrors the Method & assumptions copy shown on the live pages.

Generation

Method & assumptions

How this data works
  • This view trades immediacy for clarity, showing the system as it actually operates.
  • Settlement data is published after real time, so the view lags by design.
  • Half-hour aggregation smooths volatility and makes comparisons meaningful.
  • Many live sites show provisional data that is later revised.
  • GridGeek updates when confidence is high, not merely fastest.
Data sources
  • Elexon BMRS Actual Aggregated Generation per Type (AGPT)
  • Elexon BMRS Generation Outturn Summary (interconnectors)
What's calculated
  • Settlement-aligned 30-minute series
  • Net interconnector flow from averaged 5-minute samples
What's not included
  • Imports and exports are not treated as generation and are excluded from fuel mix percentages
Known limitations
  • Settlement periods publish after real time
  • Half-hour aggregation smooths short-term volatility

Solar

Method & assumptions

Data sources
  • BMRS
  • Open-Meteo
What's calculated
  • Daily peak
  • Rolling averages
What's not included
  • Rooftop-only telemetry gaps
Known limitations
  • Forecasts smooth intra-hour spikes
  • Weather tags are indicative

Interconnectors

Method & assumptions

Data sources
  • BMRS
  • NESO
What's calculated
  • Net import/export totals
  • Interconnector share of mix
What's not included
  • Planned outages not yet published
Known limitations
  • Connector feeds can publish late
  • Aggregate mix may hide individual flows

Pricing

Method & assumptions

Data sources
  • BMRS
What's calculated
  • Rolling averages
  • Volatility index
  • Curtailment overlay
What's not included
  • Retail tariffs
  • Network charges
Known limitations
  • Settlement corrections may adjust history
  • Partial days show published prices only

Wind curtailment

Method & assumptions

Data sources
  • BMRS
What's calculated
  • Day/week/month totals
  • Per-household impact
What's not included
  • Non-wind constraint costs
Known limitations
  • Partial days omit missing bids
  • Settlement updates may revise totals