Maine Public Service Company T t l T Total Transfer Capacity f C - - PowerPoint PPT Presentation

Maine Public Service Company T t l T f C it Total Transfer Capacity

Current Posting

MPS EXPORT ‐‐ MW

Contingency Beechwood Tinker Iroquois TTC TRM ATC Non‐Radial g y q N‐0 100 64 56 220 N‐1 64 56 100 10 90 N‐1‐1 56 56 10 46 Radial Contingency Beechwood Tinker Iroquois TTC TRM ATC N‐0 100 64 56 220 N‐1 64 64 10 54 N‐1‐1

MPS IMPORT ‐‐ MW

Non‐Radial Contingency Beechwood Tinker Iroquois TTC TRM ATC N‐0 100 64 56 220 Non Radial N‐1 64 56 90 18 72 N‐1‐1 56 56 18 38 Contingency Beechwood Tinker Iroquois TTC TRM ATC N 0 100 64 56 220 Radial N‐0 100 64 56 220 N‐1 64 56 112 18 94 N‐1‐1 56 56 18 38

Maine Public Service Company T t l T f C it Total Transfer Capacity

Proposed Posting

MPS EXPORT ‐‐ MW

Contingency Beechwood Tinker Iroquois TTC TRM ATC Non‐Radial g y q N‐0 100 67 56 223 N‐1 67 56 110 110 N‐1‐1 56 56 56 Radial Contingency Beechwood Tinker Iroquois TTC TRM ATC N‐0 100 67 56 223 N‐1 67 67 67 N‐1‐1

MPS IMPORT ‐‐ MW

Non‐Radial Contingency Beechwood Tinker Iroquois TTC TRM ATC N‐0 100 67 56 220 Non Radial N‐1 67 56 101 101 N‐1‐1 56 56 56 Contingency Beechwood Tinker Iroquois TTC TRM ATC N 0 100 67 56 220 Radial N‐0 100 67 56 220 N‐1 67 56 83 83 N‐1‐1 56 56 56

MPS Transmission System Northern Maine Load Forecast

Winter Peak Summer Peak Winter 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 669 98 0 0% 119 2 0 0% 111 1 0 0% 2010 669,798 0.50% 119.2 0.50% 111.1 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 686 711 0 50% 122 2 0 50% 113 9 0 50% 2015 686,711 0.50% 122.2 0.50% 113.9 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

Non‐Radial

Description Existing System 6 Mvar @ Mullen 6 Mvar + SVC y Case # 2009 Actual Peak Load 118.6 1 Existing MPS Transmission System; with 12 MW Tinker Generation 106.0 116.0 118.0 4 Case #1 plus Tinker Upgrade 116.0 123.0 131.0 5 Case #1 plus 11 MW Diesel/Steam 112.0 121.0 127.0 Case #1 plus 6 Case #1 plus 17 MW Sherman Gen 106.0 116.0 133.0 7 Case #1 plus 37 MW Ashland Gen 118.0 127.0 153.0

MPS Transmission System

Non‐Radial Non‐Radial

Northern Maine Load Carrying Capacity

Non‐Radial

Description Winter MW Summer MW Limiting Factor Case # 2009 Actual Peak Load 118.6 110.5 1 Base Case Existing MPS Transmission System; with 12 MW Tinker Generation 106.0 106.0 Mullen Voltage Case #1 plus 2 Case #1 plus Added Reactive @Mullen 116.0 114.0 Tinker Transformer 3 Enhanced Base Case Case #2 plus 10 Mvar (variable) from Mars Hill and 6910/6920 upgrade 118.0 114.0 Tinker Transformer 4 Case #3 plus Tinker Upgrade 131.0 131.0 Mullen Voltage 5 Case #3 plus 11 MW Diesel/Steam 127.0 123.0 Tinker Transformer Case #3 plus 6 Case #3 plus 17 MW Sherman Gen 133.0 129.0 Tinker Transformer 7 Case #3 plus 37 MW Ashland Gen 153.0 149.0 Tinker Transformer 8 2004 ABB St d New Interconnection Li t St A d (3875) 143.0 143.0 2004 ABB Study Limestone ‐ St. Andre (3875) 9 ABB Study New Interconnection Houlton ‐ Haynesville (MEPCO) 164.0 164.0

LCC results from 01/14/10 draft report prepared by NES, LLC for NMISA

MPS Transmission System

Radial Radial

Northern Maine Load Carrying Capacity

Non‐Radial

Description Winter MW Summer MW Limiting Factor Case # 2009 Actual Peak Load 118.6 110.5 1 Base Case Existing MPS Transmission System; with 12 MW Tinker Generation 90.0 90.0 Mullen Voltage Case #1 plus 2 Case #1 plus Added Reactive @Mullen 94.0 90.0 Tinker Transformer 3 Enhanced Base Case Case #2 plus 10 Mvar (variable) from Mars Hill and 6910/6920 upgrade 94.0 90.0 Tinker Transformer 4 Case #3 plus Tinker Upgrade 120.0 120.0 Mullen Voltage 5 Case #3 plus 11 MW Diesel/Steam 105.0 101.0 Tinker Transformer Case #3 plus 6 Case #3 plus 17 MW Sherman Gen 111.0 107.0 Tinker Transformer 7 Case #3 plus 37 MW Ashland Gen 134.0 130.0 Tinker Transformer 8 E ti t d New Interconnection Li t St A d (3875) 120+ 120+ Estimated Limestone ‐ St. Andre (3875) 9 Estimated New Interconnection Houlton ‐ Haynesville (MEPCO) 120+ 120+

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.