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dec-heim authored Jan 15, 2023
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## Introduction

This tool is designed to allow users to retrieve historical NEM regional emissions data, either total or marginal emissions, for any 5-minute dispatch interval or aggregations thereof. Total emissions data produced by NEMED is given as both absolute total emissions (tCO2-e) and as an emissions intensity index (tCO2-e/MWh). Marginal emissions data reflects the price setter of a particular region, yielding an emissions intensity index (tCO2-e/MWh) corresponding to a particular plant.
Although data is published by AEMO via the [Carbon Dioxide Equivalent Intensity Index (CDEII) Procedure](https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/market-operations/settlements-and-payments/settlements/carbon-dioxide-equivalent-intensity-index) this only reflects a daily summary by region of total and average emissions.
Although data is published by AEMO via the [Carbon Dioxide Equivalent Intensity Index (CDEII) Procedure](https://www.aemo.com.au/energy-systems/electricity/national-electricity-market-nem/market-operations/settlements-and-payments/settlements/carbon-dioxide-equivalent-intensity-index) this only reflects a daily summary for each region by total and (average) emissions intensity.

### How does NEMED calculate emissions?
Total Emissions are computed by considering 5-minute dispatch interval data for each generator in the NEM for the respective regions, along with their CO2-equivalent emissions factors per unit (generator) level. A detailed method of the process to produce results for: total emissions(tCO2-e) and the corresponidng emisssions intensities can be found [here](https://nemed.readthedocs.io/en/latest/method.html). The tool is able to provide these metrics on a dispatch interval basis, or aggregated to hourly, daily, monthly or yearly measures. For more advanced users, the emissions associated with each generator and hence that generator's contribution to total regional emissions can be extracted.
Total Emissions are computed by considering 5-minute generation dispatch data for each generator in the NEM for each respective region, along with their CO2-equivalent emissions factors per unit (generator) level. A detailed method of the process to produce results for total emissions(tCO2-e) and the corresponding emisssions intensities can be found [here](https://nemed.readthedocs.io/en/latest/method.html). The tool is able to provide these metrics on a dispatch interval basis, or aggregated to hourly, daily, monthly or yearly measures. For more advanced users, the emissions associated with each generator and hence that generator's contribution to total regional emissions can be extracted.

Marginal Emissions are computed by identifying the marginally dispatched generators from AEMO's Price Setter files, mapping emissions intensity metrics mentioned above and computing marginal emissions intensity (tCO2-e/MWh).

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