BETÜL ÖZER 7/13/2011

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Hi All,
I have a question: I'm checking my CO2 emission results from electrcity production for a fuel: the "transformation:output" value of is same for 2 years, but internal consumtion is different, so inputs values are different and emissions different.
The issue I don't understand why the outputs are same and inputs are different? I assumed the output means as gross production. As I'm checking internal consumption values, "output"-internal consumption="electricity generation" (from energy balance view). I think this is also related with the process efficiency.
I think the input values for the same output shld be same. After output calculation internal cosumption shld be subtracted and this is what you distribute to the grid (=electricity generation as LEAP says). Input value shld be calculated according to the output which contains internal cons., shldn't? Wld you pls tell me the algorithm for internal consumption, input values,the process (thermal) efficiency and output calculations?

Thanks in advance and rgds,

Betül

Tory Clark 7/19/2011
 

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Hi Betül,

This is related to your other question that I responded to earlier today. Since LEAP is demand driven, LEAP will always run power plants to try to meet electricity demands. In your case (in your Tez model) you are dispatching power plants to run to full capacity, which means that generation can be the same in each year if capacity and availability is the same in each year.

The most simple electricity generation calculation (assuming running to full capacity) is below:

Electricity generation (in one year) = Capacity in that year (exogenous + endogenous) * Maximum Availability * 8760 (# hours/year)

This means that if capacity and availability are the same in a given year, the outputs can be the same. The above equation will of course get more detailed as complexity is added related to system load curves and dispatch rules.

As I mentioned in my previous response (http://tinyurl.com/3rem9gu), efficiency and auxiliary fuel use govern how much fuel is required to produce a particular output. So if auxiliary fuel use or efficiency change in a given year the inputs may be different for the same output.

Best,

Tory