Carbon intensity update for 28th Sep 25

On the 28th of September 2025, the UK experienced noticeable fluctuations in carbon intensity levels throughout the day. Understanding these changes can help you make smarter energy choices and reduce your carbon footprint. By choosing to use electricity when carbon intensity is lower, you’re helping the environment and supporting a transition towards cleaner energy sources.

What Is Carbon Intensity?
Carbon intensity refers to the amount of carbon dioxide (CO₂) emitted for every kilowatt hour (kWh) of electricity consumed. Higher numbers mean more fossil fuels like coal or gas were used to generate power, while lower numbers indicate a greater share of renewables such as wind and solar.

Carbon Intensity Timeline for 28th September 2025:

• Midnight to Early Morning (23:00 – 06:00): Carbon intensity started at 139 gCO₂/kWh and gradually increased to 175 gCO₂/kWh by 06:30. A great time to charge devices or run appliances with lower environmental impact.
• Morning Peak (06:30 – 09:00): A slight surge was observed, peaking at 183 gCO₂/kWh at 07:00. Levels began to decline again by 09:00, reaching 163 gCO₂/kWh.
• Late Morning to Early Afternoon (09:00 – 14:00): Moderate carbon intensity prevailed, ranging between 158 and 169 gCO₂/kWh — a relatively eco-friendly window for home and business tasks.
• Afternoon Peak (14:00 – 17:00): Emissions spiked, reaching a very high 252 gCO₂/kWh by 17:00. If possible, avoid using power-hungry appliances during this period.
• Evening Surge (17:00 – 21:00): Carbon levels remained very high, peaking at 260 gCO₂/kWh. Consider switching off non-essential electronics and enjoying a low-energy evening.
• Late Evening (21:00 – 23:00): The intensity gradually dropped but still closed the day at a high rate of 236 gCO₂/kWh.

Why This Matters
When demand for electricity spikes, and renewable sources like wind and solar are insufficient, the grid often turns to fossil fuel generators, leading to higher emissions. By aligning energy usage with times of lower carbon intensity, we can collectively ease this burden.

At Jaxi, we’re committed to keeping you informed about real-time carbon intensity updates so you can plan smarter energy use. Small everyday actions—like running dishwashers or laundry machines during greener hours—make a big difference over time.

Stay tuned for more daily updates on carbon emissions and electricity impact. Together, we can take meaningful steps towards a sustainable, low-carbon future.