Carbon intensity update for 30th Sep 25

UK Carbon Intensity Update – 30th September 2025

At Jaxi, we’re committed to helping you make smart, sustainable energy choices. By keeping track of the UK’s carbon intensity, we empower our users to reduce their carbon footprint by scheduling appliance usage during cleaner energy periods.

The carbon intensity metric measures how much CO2 is emitted to produce each kilowatt hour (kWh) of electricity. This varies depending on the fuel sources used — when demand is high and renewable resources are insufficient, fossil fuels such as coal and natural gas are often used, resulting in higher emissions.

Here’s a breakdown of the UK’s electricity carbon intensity for September 30, 2025:

⚠️ High Carbon Intensity Periods

• 04:30 to 09:00: Emissions ranged between 210 to 220 gCO2/kWh.
• 15:00 to 20:30: Peaked at 218 gCO2/kWh, indicating heavy reliance on fossil fuel generation.

🔄 Moderate Carbon Intensity Periods

• 23:00 (Sept 29): Carbon intensity began at 173 gCO2/kWh.
• By midday: Stabilised around 144 gCO2/kWh.
• Post 21:00: Decline resumed, reaching 134 gCO2/kWh by 23:00.

Understanding when carbon intensity is lower can help households and businesses plan better energy usage. Running high-demand appliances like washing machines, dishwashers, or EV chargers during low-intensity periods can significantly reduce your environmental impact.

Our goal at Jaxi is to keep you informed with real-time updates and daily summaries so you can make energy-efficient decisions without compromising on convenience. With your help, we can work toward a greener, more sustainable UK energy system.

Tip: Bookmark this page or sign up for daily updates to stay ahead of peak carbon times and contribute to a cleaner planet.

Stay tuned for more carbon intensity updates and keep making smart energy choices with Jaxi!