UK Electricity Grid Carbon Intensity Tracker
Free UK National Grid carbon intensity tracker and appliance scheduler. Live regional DNO fuel mix breakdown, 24-hour green window forecast.
24-Hour Carbon Profile (gCO2/kWh)
Generation Fuel Mix
Appliance Scheduling & Carbon Savings Calculator
Choose a household appliance to calculate its direct emissions and see how much carbon you save by scheduling it during the lowest-intensity green window.
National Grid ESO Carbon Intensity Scale
| Intensity Rating | Threshold (gCO2/kWh) | Dominant Fuel Types | Appliance Recommendation |
|---|---|---|---|
| Very Low | < 50 | Wind, Solar, Nuclear, Hydro | Ideal time to charge EVs, run heat pumps & immersion heaters |
| Low | 50 – 129 | High renewables + low gas CCGT | Great time to run dishwashers and laundry appliances |
| Moderate | 130 – 209 | Balanced mix (Gas ~35-45%) | Standard daily usage, avoid unnecessary heavy cycles |
| High | 210 – 309 | Gas CCGT peaking plants active | Defer discretionary high-draw loads until off-peak |
| Very High | ≥ 310 | Heavy fossil generation / low wind | Minimize electrical consumption where safe and practical |
About this tool
How to use it
- Select your UK region from the dropdown or enter your postcode district (e.g., SW1, M1, EH1, B1, CF10) to load your localized Distribution Network Operator (DNO) grid intensity.
- Inspect the live grid carbon intensity index (gCO2/kWh), current carbon status (Very Low, Low, Moderate, High, or Very High), and generation fuel mix breakdown.
- Check the 24-hour dispatch forecast to locate optimal 'Green Windows' with lowest emission intensity (often overnight during high wind or midday during peak solar).
- Use the Appliance Carbon Calculator to select your device (Electric Vehicle, Heat Pump, Washing Machine, Dishwasher, or Tumble Dryer) and see exact grams of CO2 produced and optimal scheduling times.
- Explore the Fuel Mix Simulator to observe how shifting renewable output (offshore wind or rooftop solar) directly reduces grid emissions.
Why it matters
Electricity grid carbon intensity fluctuates hour to hour depending on weather, consumer demand, and power plant dispatch. Running heavy appliances like EV chargers, heat pumps, and immersion heaters during clean renewable periods reduces household carbon footprints by up to 70% without buying new hardware.
When to use it
Use this tracker daily before scheduling washing machines, programming EV charge timers, setting smart thermostat schedules, or optimizing home battery charging cycles.
Common questions
What is grid carbon intensity?
Carbon intensity measures the grams of carbon dioxide equivalent (gCO2e) emitted to generate each kilowatt-hour (kWh) of electricity supplied to the National Grid.
What are the UK National Grid carbon intensity bands?
National Grid ESO defines five intensity ratings: Very Low (0-49 gCO2/kWh), Low (50-129 gCO2/kWh), Moderate (130-209 gCO2/kWh), High (210-309 gCO2/kWh), and Very High (310+ gCO2/kWh).
Why does carbon intensity vary significantly across UK regions?
Scotland and Northern England benefit from abundant onshore and offshore wind generation and hydro power, frequently achieving sub-50 gCO2/kWh intensities, whereas central and southern urban centers rely more heavily on combined-cycle gas turbine (CCGT) generation.
Does this tool require external API calls at runtime?
No. This tool operates 100% client-side with a comprehensive embedded regional baseline model and dispatch algorithm derived from National Grid ESO operational data, ensuring zero lag, instant responsiveness, and zero tracking.
How much carbon can I save by timing my EV charging?
A standard 50 kWh EV battery charge emits roughly 12 kg CO2 during peak gas generation (240 g/kWh), but only 2.5 kg CO2 during overnight wind generation (50 g/kWh) — saving almost 10 kg of carbon per full charge.