Maine Public Service Company T t l T Total Transfer Capacity f C it Current Posting MPS EXPORT ‐‐ MW Contingency g y Beechwood Tinker Iroquois q TTC TRM ATC N ‐ 0 100 64 56 220 Non ‐ Radial N ‐ 1 0 64 56 100 10 90 N ‐ 1 ‐ 1 0 0 56 56 10 46 Contingency Beechwood Tinker Iroquois TTC TRM ATC N ‐ 0 100 64 56 220 Radial N ‐ 1 0 64 0 64 10 54 N ‐ 1 ‐ 1 0 0 0 0 0 0 MPS IMPORT ‐‐ MW Contingency Beechwood Tinker Iroquois TTC TRM ATC N ‐ 0 100 64 56 220 Non Radial Non ‐ Radial N ‐ 1 0 64 56 90 18 72 N ‐ 1 ‐ 1 0 0 56 56 18 38 Contingency Beechwood Tinker Iroquois TTC TRM ATC N 0 N ‐ 0 100 100 64 64 56 56 220 220 Radial N ‐ 1 0 64 56 112 18 94 N ‐ 1 ‐ 1 0 0 56 56 18 38
Maine Public Service Company T t l T Total Transfer Capacity f C it Proposed Posting MPS EXPORT ‐‐ MW Contingency g y Beechwood Tinker Iroquois q TTC TRM ATC N ‐ 0 100 67 56 223 Non ‐ Radial N ‐ 1 0 67 56 110 0 110 N ‐ 1 ‐ 1 0 0 56 56 0 56 Contingency Beechwood Tinker Iroquois TTC TRM ATC N ‐ 0 100 67 56 223 Radial N ‐ 1 0 67 0 67 0 67 N ‐ 1 ‐ 1 0 0 0 0 0 0 MPS IMPORT ‐‐ MW Contingency Beechwood Tinker Iroquois TTC TRM ATC N ‐ 0 100 67 56 220 Non Radial Non ‐ Radial N ‐ 1 0 67 56 101 0 101 N ‐ 1 ‐ 1 0 0 56 56 0 56 Contingency Beechwood Tinker Iroquois TTC TRM ATC N 0 N ‐ 0 100 100 67 67 56 56 220 220 Radial N ‐ 1 0 67 56 83 0 83 N ‐ 1 ‐ 1 0 0 56 56 0 56
MPS Transmission System Northern Maine Load Forecast Winter Peak Winter Peak Summer Peak Summer Peak MWh MW MW ∆ % ∆ % ∆ % 2002 act 710,399 123.5 112.0 2003 act 724,574 2.00% 120.9 ‐ 2.11% 110.5 ‐ 1.34% 2004 act 731,915 1.01% 129.1 6.78% 109.8 ‐ 0.63% 2005 act 740,758 1.21% 126.1 ‐ 2.32% 116.9 6.47% 2006 act 740,708 ‐ 0.01% 125.2 ‐ 0.71% 113.3 ‐ 3.08% 2007 act 735,547 ‐ 0.70% 121.5 ‐ 2.96% 116.9 3.18% 2008 act 712,298 ‐ 3.16% 117.5 ‐ 3.29% 112.8 ‐ 3.51% 2009 act 666,466 ‐ 6.43% 118.6 0.94% 110.5 ‐ 2.04% 2010 2010 669,798 669 98 0 0% 0.50% 119 2 119.2 0 0% 0.50% 111.1 111 1 0 0% 0.50% 2011 673,147 0.50% 119.8 0.50% 111.7 0.50% 2012 676,513 0.50% 120.4 0.50% 112.2 0.50% 2013 679,895 0.50% 121.0 0.50% 112.8 0.50% 2014 683,295 0.50% 121.6 0.50% 113.3 0.50% 2015 2015 686 711 686,711 0.50% 0 50% 122 2 122.2 0 50% 0.50% 113.9 113 9 0 50% 0.50% 2016 690,145 0.50% 122.8 0.50% 114.5 0.50% 2017 693,595 0.50% 123.5 0.50% 115.0 0.50% 2018 697,063 0.50% 124.1 0.50% 115.6 0.50% 2019 700,549 0.50% 124.7 0.50% 116.2 0.50%
MPS Transmission System Non ‐ Radial Non ‐ Radial Northern Maine Load Carrying Capacity ‐‐ Winter MW Existing 6 Mvar @ Non ‐ Radial Description 6 Mvar + SVC System y Mullen Case # 2009 Actual Peak Load 118.6 Existing MPS Transmission System; 1 106.0 116.0 118.0 with 12 MW Tinker Generation Case #1 plus 4 116.0 123.0 131.0 Tinker Upgrade Case #1 plus 5 112.0 121.0 127.0 11 MW Diesel/Steam Case #1 plus Case #1 plus 6 106.0 116.0 133.0 17 MW Sherman Gen Case #1 plus 7 118.0 127.0 153.0 37 MW Ashland Gen
MPS Transmission System Non ‐ Radial Non ‐ Radial Northern Maine Load Carrying Capacity Winter Summer Non ‐ Radial Description Limiting Factor MW MW Case # 2009 Actual Peak Load 118.6 110.5 1 Existing MPS Transmission System; 106.0 106.0 Mullen Voltage Base Case with 12 MW Tinker Generation Case #1 plus Case #1 plus 2 116.0 114.0 Tinker Transformer Added Reactive @Mullen Case #2 plus 3 10 Mvar (variable) from Mars Hill and 118.0 114.0 Tinker Transformer Enhanced Base Case 6910/6920 upgrade Case #3 plus 4 131.0 131.0 Mullen Voltage Tinker Upgrade Case #3 plus 5 127.0 123.0 Tinker Transformer 11 MW Diesel/Steam Case #3 plus Case #3 plus 6 133.0 129.0 Tinker Transformer 17 MW Sherman Gen Case #3 plus 7 153.0 149.0 Tinker Transformer 37 MW Ashland Gen 8 New Interconnection 143.0 143.0 2004 ABB St d 2004 ABB Study Li Limestone ‐ St. Andre (3875) t St A d (3875) 9 New Interconnection 164.0 164.0 ABB Study Houlton ‐ Haynesville (MEPCO) LCC results from 01/14/10 draft report prepared by NES, LLC for NMISA
MPS Transmission System Radial Radial Northern Maine Load Carrying Capacity Winter Summer Non ‐ Radial Description Limiting Factor MW MW Case # 2009 Actual Peak Load 118.6 110.5 1 Existing MPS Transmission System; 90.0 90.0 Mullen Voltage Base Case with 12 MW Tinker Generation Case #1 plus Case #1 plus 2 94.0 90.0 Tinker Transformer Added Reactive @Mullen Case #2 plus 3 10 Mvar (variable) from Mars Hill and 94.0 90.0 Tinker Transformer Enhanced Base Case 6910/6920 upgrade Case #3 plus 4 120.0 120.0 Mullen Voltage Tinker Upgrade Case #3 plus 5 105.0 101.0 Tinker Transformer 11 MW Diesel/Steam Case #3 plus Case #3 plus 6 111.0 107.0 Tinker Transformer 17 MW Sherman Gen Case #3 plus 7 134.0 130.0 Tinker Transformer 37 MW Ashland Gen 8 New Interconnection 120+ 120+ E ti Estimated t d Li Limestone ‐ St. Andre (3875) t St A d (3875) 9 New Interconnection 120+ 120+ Estimated Houlton ‐ Haynesville (MEPCO) LCC results from 01/14/10 draft report prepared by NES, LLC for NMISA
MPS LOAD FLOW ANALYSIS MPS LOAD FLOW ANALYSIS Approach Approach • Modeled approximately 75 Load Flow Cases with varying load conditions varying load conditions • Determined system instability limits under • Determined system instability limits under multiple generation scenarios • Modified Load versus Generation to evaluate Export and Import limitations Export and Import limitations
MPS Proposed Solutions MPS Proposed Solutions • Short ‐ term Short term – Additional Reactive at Mullen (6.4 Mvar fixed) • Intermediate – SVC installation (0 – 10 Mvar variable) • Long ‐ term – Transmission Interconnection with ISO N E Transmission Interconnection with ISO N.E.
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