Today the UK grid carbon intensity was 81g CO2e/kWh. This because we were using 35% wind, 23% solar, 20% nuclear.
This compares to 235gCO2e/kWh average over the last 12 months.
Regionally there is a difference (as different parts of the grid have different ratios of renewables). The greenest part of the grid was NE England (14) and S. Scotland (21), the least green was Yorkshire (253). See: https://carbonintensity.org.uk/ or use the App gridcarbon on your mobile phone.
These regional variations are down to where the renewables are connected. So if you live in Scotland or the SW generally you get “greener” electricity becasue there is more green energy on your local grid. Using the carbonintensity data you could decide when to charge your car or put on the dishwasher based on the current carbon intensity of your local grid. A neat way to be greener in your energy use at home.
This has nothing to do with what supplier you have or whether you are on a “green” tariff. We all share the grid and pay for much of the renewable generation through a contribution in all our energy bills (that pays for the government support mechanisms for large scale renewable installation - ROC, FIT and CfD).
Today was another day of negative energy prices, again driven by the amount of solar and wind generation. If you are lucky enough to be on the Octopus Energy Agile tariff (with smart meter) then you would have been paid over 4p/kWh to use energy from 9am to 4pm today!
So whilst the sun shines and wind blows we are also pumping out much less CO2.