GHG Emission Tracking Report Abhishek Hundiwale Lead Engineering - - PowerPoint PPT Presentation

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GHG Emission Tracking Report

Abhishek Hundiwale Lead Engineering Specialist November 14, 2016

CAISO Public

Agenda

• Background
• GHG emission calculation

– Total GHG emissions to serve ISO load – Cumulative effect of EIM on GHG emissions

• Conclusion and next steps

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CAISO Public

Background

• ISO has committed to track GHG emissions serving ISO

load

• Report is preliminary and for informational purposes only
• Does not replace CARB’s regulation for GHG accounting

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CAISO Public

Total GHG emissions to serve ISO load

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3,000,000 3,500,000 4,000,000 4,500,000 5,000,000 5,500,000 6,000,000 6,500,000 7,000,000 7,500,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec mTCO2

Total GHG Emission to serve ISO load

2014 2015 2016

YTD (January - September) million mTCO2 2014 2015 2016 GHG Emission to serve ISO load 51.81 49.53 43.15

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Methodology to track GHG emissions to serve ISO load

• Comparison GHG emissions pattern for years 2014 - 2016
• Total GHG emissions to serve ISO load

= GHG emissions from internal ISO dispatches including dynamic schedules + GHG emissions from imports serving ISO load (imports minus exports) + GHG Impact from EIM transfers into ISO using counter-factual determination

• GHG Impact from EIM transfers out of ISO using counter-factual

determination

• GHG Emissions (mTCO2) = resource heat rate (MMBTU/MWh) * CO2

emission factor by resource type (mTCO2/MMBTU) * Energy (MWh)

• For unspecified imports emission rate of 0.428 mTCO2/MWh used
• Higher solar production along with improved hydro conditions in 2016

contribute to GHG emissions reductions compared to 2014 – 2015.

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CAISO Public

Example 1: Total GHG emissions to serve ISO load

Total GHG emission to serve ISO load GHGiso = GHGGiso + GHGIiso – GHGEiso + GHGTiso,in = 29.77 + 21.4 – 8.56 + 3.82 = 46.43 mTCO2 Where: GHGGiso = GHGG,A + GHGG,B + GHGG,C = (8500/1000) MMBTU/MWh x 0.053165 mTCO2/MMBTU x10 MWh + (9500/1000) MMBTU/MWh x 0.053165 mTCO2/MMBTU x 50 MWh + 0 = 29.77 mTCO2 GHGIiso = 50MWh x 0.428 mTCO2/MWh = 21.4 mTCO2 GHGEiso = 20MWh x 0.428 mTCO2/MWh = 8.56 mTCO2 GHGTiso,in = 3.82 mTCO2 (Based on EIM counter-factual comparison)

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ISO

GA = 10 MW (Gas) GB = 50 MW (Gas) GC = 100 MW (Wind) Load = 200 MW Imports = 50 MW Exports = 20 MW Tiso,in = 10 MW

External EIM Area

GX = 3 MW (Hydro) GY = 1 MW (Coal) GX = 6 MW (Gas)

EIM Case

Gas Resource Heat Rate (BTU/KWh) GHG Emission Rate (mTCO2/MMBTU) GHG Emission Rate (mTCO2/MWh)

10,000 0.053165 0.53165 9500 0.053165 0.50507 8500 0.053165 0.45190

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GHG emission calculation – Cumulative effect of Energy Imbalance Market on GHG emissions

• Uses counter-factual determination without EIM transfers
• Compares

– EIM Transfers into ISO: GHG of external resources supporting ISO imbalances and internal ISO supply displaced by EIM transfers to the ISO – EIM Transfers out of ISO: GHG of internal supply supporting transfers and external resources displaced by EIM transfers out of ISO

• Positive benefits indicate how EIM transfers have reduced

GHG emissions relative to a counter-factual assessment

• f emissions across the ISO and EIM balancing authority

areas without EIM transfers

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CAISO Public

Cumulative effect of Energy Imbalance Market on GHG emissions

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• 50,000

50,000 100,000 150,000 200,000 250,000 300,000 350,000 1-Jan 8-Jan 15-Jan 22-Jan 29-Jan 5-Feb 12-Feb 19-Feb 26-Feb 4-Mar 11-Mar 18-Mar 25-Mar 1-Apr 8-Apr 15-Apr 22-Apr 29-Apr 6-May 13-May 20-May 27-May 3-Jun 10-Jun 17-Jun 24-Jun 1-Jul 8-Jul 15-Jul 22-Jul 29-Jul 5-Aug 12-Aug 19-Aug 26-Aug 2-Sep 9-Sep 16-Sep 23-Sep 30-Sep

Reduced GHG (mTCO2)

EIM GHG Reduction

YTD Cumulative EIM GHG Reduction

136,724 mTCO2

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Example 2: EIM effect on GHG emissions

• GHG emissions of external resources supporting EIM transfer are determined by

comparing dispatch of the EIM case with counter-factual (CF) case without transfers: – Tiso,in = 10 MW transfer provided by

• ∆Gx = 3 MW (Hydro)
• ∆Gy = 1 MW (Coal resource with heat rate = 10000 BTU/KWh)
• ∆Gz = 6 MW (Gas resource with heat rate = 9000 BTU/KWh)
• GHG emissions of internal ISO resources displaced by EIM transfers are determined

by comparing EIM case with the counter-factual case without transfers: – Tiso,disp

• ∆GA= 4 MW (Gas with heat rate of 10000 BTU/KWh)
• ∆GB= 6 MW (Gas with heat rate of 9000 BTU/KWh)

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ISO

GA = 10 MW (Gas) GB = 50 MW (Gas) GC = 100 MW (Wind) Load = 200 MW Imports = 50 MW Exports = 20 MW Tiso,in = 10 MW

External EIM Area

GX = 3 MW (Hydro) GY = 1 MW (Coal) GX = 6 MW (Gas)

EIM Case

ISO

GA = 14 MW ↑ 4 MW GB = 16 MW ↑ 6 MW GC = 100 MW Load = 200 MW Imports = 50 MW Exports = 20 MW Tiso,in=0MW↓10 MW

External EIM Area

GX = 0 MW ↓3 MW GY = 0 MW ↓1 MW GZ = 0 MW ↓6 MW

Counter-Factual (CF) Case

CAISO Public

Example 2: EIM effect on GHG emissions

Overall EIM GHG Reduction = (-1)*(GHGTiso,in - GHGTiso,disp) = (-1)*(3.82 - 4.99) mTCO2 = 1.17 mTCO2 Where: GHGTiso,in = ∆Gx x 0 mTCO2 + ∆GY x 0.09471 mTCO2/MMBTU x (10000/1000) MMBTU/MWh + ∆GZ x 0.05316 mTCO2/MMBTU x (9000/1000) MMBTU/MWh = 3.82 mTCO2 GHGTiso,disp = ∆GA x 0.05316 mTCO2/MMBTU x (10000/1000) MMBTU/MWh + ∆GB x 0.05316 mTCO2/MMBTU x (9000/1000) MMBTU/MWh = 4.99 mTCO2

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CAISO Public

Conclusion

• Tracking report will be published monthly
• Report will

– Track annual GHG total emissions serving ISO load – Show year-over-year and seasonal trends – Illustrate effects of EIM on GHG emissions

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CAISO Public

Questions

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