Open Llannelongue opened 1 year ago
carbonintensity.org.uk says (under Methodology):
The demand and generation by fuel type (gas, coal, wind, nuclear, solar etc.) for each region is forecast several days ahead at 30-min temporal resolution [...]. The forecasts are updated every 30 mins using a nowcasting technique to adjust the forecasts a short period ahead.
The natiogridESO report (link) says:
The GB carbon intensity $C_t$ at time $t$ is found by weighting the carbon intensity $cg$ for fuel type $g$ by the generation $P{g,t}$ of that fuel type. This is then divided by national demand $D_t$ to give the carbon intensity for GB
To me this is indicating that intensity values provided by the API are point estimates rather that the result of an average over the 30min period.
Let's see what they say
@Llannelongue did you hear from the people behind carbonintensity.org.uk about this?
We have been discussing with @tlestang about what the data collected by the carbon intensity.org.uk represents, and therefore how best to calculate the average CI over a long period of time.
The API sends data for 30min periods, each value having a
from
and ato
parameter (e.g. 50 gCO2e from 7:00am to 7:30am).There are at least two ways these values can have been obtained (figure below).
Assuming the blue line is the real (continue) CI forecast:
Probably best to have both options implemented for when/if we add now APIs, but also good to have a good understanding of what's best.
I'm emailing the people in charge to ask about that, but good to hear everyone's thoughts about that! (as it's quite an important part of the tool!)