CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Interchange Capacity between Portugal and Spain Methodology, Evolution and its use in the MIBEL environment Rui Pestana 2 nd International Conference on Electrical Engineering Coimbra, 28 November 2007

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Methodology ETSO REN & REE 2.Evolution Structural (investments) Not Structural (investigation) 3.Use Yearly : Monthly : Jan-Nov 2007 oMIBEL (>1-Jul-2007) Interchange Capacity between Portugal and Spain

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November ETSO – European Transmission System Operator TTC – Total Transfer Capacity NTC – Net Transfer Capacity oNTC = TTC – TRM TRM – Transmission Reliability Margin AAC – Already Allocated Capacity ATC – Available Transmission Capacity oATC = NTC – AAC Methodology – ETSO

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Methodology – ETSO

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Parallel Flows It is not possible to define an NTC for all pairs of countries Methodology – Limitations

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Program versus Physical The generation Shift is not equal to Physical flow change at the tie-lines Methodology – Limitations oNTF – Notified Transmission Flow oTTF – Total Transfer Flow

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Generation Shift oStart with base case including some Import/Export flow oIncrease Generation on system A  Limited by Generation Capacity oDecrease Generation on system B Methodology – Computation

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Export of Portugal –It maybe limit Generation capacity in Portugal –The hydro (run-of-river) is not mobilized –The renewable (wind) is also not mobilized Methodology – Computation

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Import from Spain –There is no limit in the Generation capacity, since we may import from France (in theory) Methodology – Computation

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Generation Shift oNo load changes oTSO A computes  For Generation in A  It uses economic merit order (economical signal)  For Generation in B  It uses pro-rata order (no economical signal)  These differences may be justified because the limit from A to B computed by A is different from the computation by B. In ETSO all TSO must provide reference save cases (winter and Summer)  Where all network elements are available (not realistic) Methodology – Computation

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Summer and Winter NTC in Europe Methodology – ETSO

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November New procedure on the Iberian Methodology –Horizons –Time date to deliver data and results –Unavailability of network and generation That influence the Interchange Capacity More realistic than ETSO –Generation order merit More realistic than ETSO Methodology – REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November New procedure on the Iberian Methodology –TRM - Transmission Reliability Margin 10% of the Capacity with a minimum of 100 MW  Covers errors on the network model used for the computation  Covers Load forecast errors  Covers Renewable Generation forecast errors –Network security rules for each TSO  Contingency analysis is also applied in foreign network  Each TSO checks its network limits  Overload in foreign network is ignored  Different results may show up ! Methodology – REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Horizons –Yearly REN : Monthly discrimination (ERSE, Hydrology) REE : Season discrimination –Trimester Work day and weekend peak and off-peak discrimination –Monthly Daily peak and off-peak discrimination –Weekly For two weeks Hourly discrimination Methodology – REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Firmness (situation before MIBEL) Methodology – REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November PTR – Physical Transmission Rights –After the Capacity is given in the daily market, if there is a need to reduce the interchange capacity, the TSO uses “counter trading” to guarantee the Transmission Rights Auction –“Use it or get paid for it” Methodology – REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Capacity work flow MIBEL : Market ( OMEL + OMIP/OMIClear ) + TSO ( REE + REN)

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Methodology ETSO REN & REE 2.Evolution Structural (investments) Not Structural (investigations) 3.Use Yearly : Monthly : Jan-Nov 2007 oMIBEL (>1-Jul-2007) Interchange Capacity between Portugal and Spain

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Situation in 2002 –2 x 400 kV Alto Lindoso – Cartelle Falagueira - Cedillo –3 x 220 kV Bemposta – Aldeadávila Pocinho – Aldeadávila Pocinho – Saucelle Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Work plan : 1 st Phase (until 2008) –New tie lines LALCTL LAVBAL –Upgrade Corridor on Tagus Corridor on Douro Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Situation in 2006 –4 x 400 kV 2 x Alto Lindoso – Cartelle Falagueira – Cedillo Alqueva - Balboa –3 x 220 kV Bemposta – Aldeadávila Pocinho – Aldeadávila Pocinho – Saucelle Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Where the Energy Flows ? Monthly Net Flow in 2006 by tie lines (+) Portugal to Spain Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Where the Energy Flows ? We have (±)43% of loop flows Evolution of the Tie Lines 2x58% 7% 2x14% 17% 19%

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Upgrade in Douro corridor –New Substation at International Douro Lagoaça : 400/220 kV –To avoid the loop flows –New 400 kV Line Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Uprating on Tagus corridor Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November New tie lines –Algarve Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November High Speed Rail –Requires 400 kV Double phase load Needs a very high short circuit current Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November High Speed Rail –Porto – Vigo Will increase Import Capacity Populated region Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November High Speed Rail –Évora – Badajoz Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Situation in 201? –8 x 400 kV –3 x 220 kV Evolution of the Tie Lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November When we solve the “bottleneck of the tie-lines” we get congestions on the internal lines –Uprating From 50ºC to 75ºC From 50ºC to 85ºC From Bear to Zebra From Zebra to Zambeze –Upgrade From 150 kV to 220 kV From 220 kV to 400 kV Evolution of the Network

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Uprating since value is estimated Evolution of the Network We have uprated 35% of the lines

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Temperature of conductors Thermal equilibrium Investigation : Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Temperature of conductors Static values Real Time Ratings I – current – dynamic R – Solar Radiation – static = 1000 W/m2 Ta – Ambient Temperature – reference W – Wind speed – static = 0.6m/s = 2ft/s

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November R – Solar Radiation – dynamic Summer case : 12 th July 2005 During Peak load the Solar radiation is 1000 W/m2 Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November R – Solar Radiation – dynamic Winter case : 27 th January 2005 During Peak load the Solar radiation is 0 W/m2 Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weather Conditions – for off-line Studies Ambient Temperature –After sunrise : Monthly reference temperature –Before sunrise : Monthly reference temperature minus 5ºC Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weather Conditions – for off-line Studies Ambient Temperature –After sunrise : Monthly reference temperature –Before sunrise : Monthly reference temperature minus 5ºC Solar Radiation –During day time : 1000 W/m2 –During night time : 0 W/m2 Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weather Conditions – for off-line Studies During the off-peak hours the price in the pool is lower and we trade more, so we need more capacity on the network (and it’s there) Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Temperature of conductors Dynamic values Real Time Ratings I – current – dynamic R – Solar Radiation – dynamic Ta – Ambient Temperature – dynamic W – Wind speed – static = 0.6m/s = 2ft/s

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November CAT-1 pilot project –To validate the hypotheses Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November CAT-1 Installation in 2004 –GSM uplink Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November CAT-1 upgrade in 2005 –FO link to SCADA Real Time Ratings

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Methodology ETSO REN & REE 2.Evolution Structural (investments) Not Structural (investigation) 3.Use Yearly : Monthly : Jan-Nov 2007 oMIBEL (>1-Jul-2007) Interchange Capacity between Portugal and Spain

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November oThey are not equal oThe importing country tends to limit the flow  It is easier to export problems Yearly results : REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November oIn case of the exporting country is limiting the capacity, it is caused by generation capacity and not by network capacity  In theory there is no network restrictions Yearly results : REN and REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Monthly results : REN

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Monthly results : REE

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REN - Export

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REN - Import

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REE - Export

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REE - Import

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REE + REN

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Weekly results : REE + REN - Import

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Results : 2001 to 2007 (Nov) Export : Portugal to Spain Significant increase from 2004 to 2005 Decrease in 2006 –Less generation to export

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Results : 2001 to 2007 (Nov) Import : Spain to Portugal 2004 : Best in guarantee 2005 : Maximum value 2006 : small decrease

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Interchange Capacity : 2001 to 2007 (Nov) There is NO guarantee that we can import or export all the time Number of hours with NO capacity

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Use in 2005 Maintenance in August

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Use in 2006 Maintenance in August

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Use in 2007 (until 22-Nov-2007) MIBEL started at 1-Jul-2007

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Use in 2007 (until 22-Nov-2007) November 2007 (incomplete) In Spain : –10 GW of Thermal power plants not available –10 GW of Hydro power plants with no water

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November MIBEL – Iberian pool Market Split – Why? If the Interchange Capacity is limiting the Market, it will split the Iberian Market and we have two market prices: Portuguese and Spanish. Vendors Energy Prices Buyers

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November MIBEL – Iberian pool Market Split – Why? If the Interchange Capacity is limiting the Market, it will split the Iberian Market and we have two market prices: Portuguese and Spanish. Congestion Rent * Price in Portugal Price in Spain Buyers Vendors Energy in Portugal, including imports from Spain Buyers Vendors Energy in Spain, including exports to Portugal *

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Conclusions What is the amount of interchange capacity need for MIBEL ? –In the beginning, the prices are too different, thus we need more capacity than what we have –In the end, when we have the same price, zero capacity is enough –New players installing additional generation in Portugal will decrease the pressure (2009/2010) What is the target of the Iberian TSO (REN and REE) ? –3000 MW in the next decade Interchange Capacity between Portugal and Spain

CEE’07 - International Conference on Electrical Engineering Coimbra, 28 November Thanks