More specifically can anyone tell me the CO2 emissions associated with delivering 1kWh to the end user - I appreciate it may be different depending upon whether it's oil, gas, or coal fired but some sort of average will suffice.
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There are several rules of thumb of CO2 emissions.
1) Coal = 2.0 lbs CO2/ KWhr
2) Oil = 1.4 lbs/KWHr
3) Gas = 1.0 lbs/KWHr
The actual numbers depend on the efficiency of the actual power plant, but this is close enough. The factor that we do not know is related to efficiency of the transmission and how far away the end user is. I suspect in the UK the loses are less than in the US because the transmission distances are shorter. I would guess at a 5% loss in transformer and line losses. So increase the lbs above by 5% to get the CO2 per KWHr.
1) Coal = 2.0 lbs CO2/ KWhr
2) Oil = 1.4 lbs/KWHr
3) Gas = 1.0 lbs/KWHr
The actual numbers depend on the efficiency of the actual power plant, but this is close enough. The factor that we do not know is related to efficiency of the transmission and how far away the end user is. I suspect in the UK the loses are less than in the US because the transmission distances are shorter. I would guess at a 5% loss in transformer and line losses. So increase the lbs above by 5% to get the CO2 per KWHr.