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

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 Page 2 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 Page 3 CAISO Public

Total GHG emissions to serve ISO load Total GHG Emission to serve ISO load 7,500,000 7,000,000 6,500,000 6,000,000 5,500,000 mTCO2 5,000,000 4,500,000 4,000,000 3,500,000 3,000,000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2014 2015 2016 YTD (January - September) 2014 2015 2016 million mTCO2 GHG Emission to serve ISO load 51.81 49.53 43.15 Page 4 CAISO Public

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. Page 5 CAISO Public

Example 1: Total GHG emissions to serve ISO load Gas Resource External EIM ISO T iso,in = 10 MW GHG Emission GHG Emission Area Heat Rate G A = 10 MW (Gas) Rate Rate G X = 3 MW (Hydro) (BTU/KWh) G B = 50 MW (Gas) (mTCO2/MMBTU) (mTCO2/MWh) G Y = 1 MW (Coal) G C = 100 MW (Wind) G X = 6 MW (Gas) Load = 200 MW 10,000 0.053165 0.53165 Imports = 50 MW 9500 0.053165 0.50507 Exports = 20 MW 8500 0.053165 0.45190 EIM Case Total GHG emission to serve ISO load = GHG Giso + GHG Iiso – GHG Eiso + GHG Tiso,in GHG iso = 29.77 + 21.4 – 8.56 + 3.82 = 46.43 mTCO2 Where: GHG Giso = GHG G,A + GHG G,B + GHG G,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 GHG Iiso = 50MWh x 0.428 mTCO2/MWh = 21.4 mTCO2 GHG Eiso = 20MWh x 0.428 mTCO2/MWh = 8.56 mTCO2 GHG Tiso,in = 3.82 mTCO2 (Based on EIM counter-factual comparison) Page 6 CAISO Public

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 of emissions across the ISO and EIM balancing authority areas without EIM transfers Page 7 CAISO Public

GHG emissions Cumulative effect of Energy Imbalance Market on Reduced GHG (mTCO2) 100,000 150,000 200,000 250,000 300,000 350,000 -50,000 50,000 0 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 YTD Cumulative EIM GHG Reduction EIM GHG Reduction 15-Apr CAISO Public 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 136,724 mTCO2 12-Aug 19-Aug 26-Aug 2-Sep 9-Sep 16-Sep Page 8 23-Sep 30-Sep

Example 2: EIM effect on GHG emissions External T iso,in =0MW ↓10 MW External ISO ISO T iso,in = 10 MW EIM Area G A = 14 MW ↑ 4 MW G A = 10 MW (Gas) EIM Area G B = 50 MW (Gas) G B = 16 MW ↑ 6 MW G X = 3 MW (Hydro) G X = 0 MW ↓3 MW G C = 100 MW (Wind) G C = 100 MW G Y = 1 MW (Coal) G Y = 0 MW ↓1 MW Load = 200 MW Load = 200 MW G X = 6 MW (Gas) G Z = 0 MW ↓6 MW Imports = 50 MW Imports = 50 MW Exports = 20 MW Exports = 20 MW EIM Case Counter-Factual (CF) Case • GHG emissions of external resources supporting EIM transfer are determined by comparing dispatch of the EIM case with counter-factual (CF) case without transfers: – T iso,in = 10 MW transfer provided by • ∆ G x = 3 MW (Hydro) • ∆ G y = 1 MW (Coal resource with heat rate = 10000 BTU/KWh) • ∆ G z = 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: – T iso,disp • ∆ G A = 4 MW (Gas with heat rate of 10000 BTU/KWh) • ∆ G B = 6 MW (Gas with heat rate of 9000 BTU/KWh) Page 9 CAISO Public

Example 2: EIM effect on GHG emissions Overall EIM GHG Reduction = (-1)*(GHG Tiso,in - GHG Tiso,disp ) = (-1)*(3.82 - 4.99) mTCO2 = 1.17 mTCO2 Where: GHG Tiso,in = ∆ G x x 0 mTCO2 + ∆G Y x 0.09471 mTCO2/MMBTU x (10000/1000) MMBTU/MWh + ∆ G Z x 0.05316 mTCO2/MMBTU x (9000/1000) MMBTU/MWh = 3.82 mTCO2 GHG Tiso,disp = ∆ G A x 0.05316 mTCO2/MMBTU x (10000/1000) MMBTU/MWh + ∆ G B x 0.05316 mTCO2/MMBTU x (9000/1000) MMBTU/MWh = 4.99 mTCO2 Page 10 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 Page 11 CAISO Public

Questions Page 12 CAISO Public