System Operations Economic Dispatch of Power Plants in

System Operations Priority Order 1. 2. 3. 4. 5. Safety of Persons Protection of

System Operations Dispatch Network Control

Plant Dispatch • Dispatchable – Large Hydro – Thermal • Non – dispatchable –

Daily Load curve on 25 th April 2016 3000 2500 Peaking Plants BL Coal

Base-load Plants • Coal plants • Low cost thermal Plants • Must run hydro

Intermediate Plants • Hydro plants dispatch on CEB requirement • Combine Cycle Plant •

3000 Daily load curve on 25 th April 2016 2500 Peaking Plants 2000 1500

Water Utilization Priority 1. Water Service and Drainage – Pushing salinity at Ambatale –

Laxapana Hydro Power Complex Moussakelle Reservoir Castlereagh Reservoir CANYON P. S. 2 X 30

Mahaweli Hydro Power Complex U / Kotmale 2 X 75 MW Kotmale 3 X

Thermal Plant Dispatch Merit order Dispatch of Power Plants

Unit Cost Calculation • Capacity Cost – – – Loan repayment Cost of Capital

00: 00 01: 00 02: 00 03: 00 04: 00 05: 00 06: 00

Network Control • Monitor and control the System Voltage by monitoring voltages on the

NCRE Operations • Not dispatch • Can see as a reduction of demand •

CEB has 3900 MW installed capacity But cannot meet 2300 MW peak demand

Total Installed Capacity Maximum Non Firm Capacity Dispatchable Capacity avbl. Capacity In March Laxapana

• CEB deliberately drawdown the reservoirs in 2016 Faster than any other year

GWh Storage Variation 2010 - 2016 1400. 0 2012 2013 2014 2016 2015 1200.

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System Operations & Economic Dispatch of Power Plants in the Operation of the Power System

System Operations Priority Order 1. 2. 3. 4. 5. Safety of Persons Protection of Equipment Availability of Supply Quality of Supply Economics of Operations

System Operations Dispatch Network Control

Plant Dispatch • Dispatchable – Large Hydro – Thermal • Non – dispatchable – NCRE (Embedded Generation) – – Mini/Micro Hydro Wind Solar Dendro

Daily Load curve on 25 th April 2016 3000 2500 Peaking Plants BL Coal 2000 Intermediate Plants 1500 BL CEB Thermal BL IPP THERMAL BL CEB Hydro IL CEB THERMAL 1000 IL IPP THEMAL Base load Plants IL CEB HYDRO WIND 500 P CEB HYDRO P CEB THERMAL : 0 0 12 : 0 0 13 : 0 0 14 : 0 0 15 : 0 0 16 : 0 0 17 : 0 0 18 : 0 0 19 : 0 0 20 : 0 0 21 : 0 0 22 : 0 0 23 : 0 0 0 : 0 11 10 00 9: 00 8: 00 7: 00 6: 00 5: 00 4: 00 3: 00 2: 00 1: 00 0

Base-load Plants • Coal plants • Low cost thermal Plants • Must run hydro plants for irrigation and drinking water • Run-off river plants

Intermediate Plants • Hydro plants dispatch on CEB requirement • Combine Cycle Plant • Diesel cycle plants

Peaking Plants • Hydro • Gas turbines

3000 Daily load curve on 25 th April 2016 2500 Peaking Plants 2000 1500 BL Coal BL CEB Thermal BL IPP THERMAL Intermediate Plants BL CEB Hydro IL CEB THERMAL IL IPP THEMAL 1000 500 IL CEB HYDRO Base load Plants WIND P CEB HYDRO P CEB THERMAL 0: 00 1: 00 2: 00 3: 00 4: 00 5: 00 6: 00 7: 00 8: 00 9: 00 10: 00 11: 00 12: 00 13: 00 14: 00 15: 00 16: 00 17: 00 18: 00 19: 00 20: 00 21: 00 22: 00 23: 00 0

Hydro Plant Dispatch

Water Utilization Priority 1. Water Service and Drainage – Pushing salinity at Ambatale – Drinking water requirement of Kandy 2. Environment – Mosquito Control at downstream of Victoria dam etc. 3. Irrigation – – Irrigation requirement at Anuradhapura Irrigation requirement at Polonnaruwa Irrigation requirement at System “C” Irrigation requirement at Kaltota etc. 4. Power

Laxapana Hydro Power Complex Moussakelle Reservoir Castlereagh Reservoir CANYON P. S. 2 X 30 MW WIMALASURENDRA P. S. 2 X 25 MW Kehelgamu Oya Norton Pond OLD LAXAP. P. S. 50 MW NEW LAXAP. P. S. 2 X 50 MW Laxapana Pond Canyon Pond Maskeli Oya POLPITIYA P. S. 2 X 37. 5 MW SCC, Transmission Division, CEB 12

Mahaweli Hydro Power Complex U / Kotmale 2 X 75 MW Kotmale 3 X 67 MW Polgolla Barrage Mahaweli Ganga Kotmale Oya Tunnel to Ukuwela P. S. Victoria Bowathenna 3 X 70 MW 1 X 40 MW UKUWELA P. S. 2 X 20 MW Tunnel to Kalawewa Area Randenigala 2 X 62 MW Rantambe 2 X 25 MW SCC, Transmission Division, CEB

Thermal Plant Dispatch Merit order Dispatch of Power Plants

Unit Cost Calculation • Capacity Cost – – – Loan repayment Cost of Capital ROE Rent, Lease & any statuary costs Other fixed O&M etc. • Energy Cost – Fuel cost – Non-fuel cost – Variable O&M • Startup Cost – Diesel cost – Aux Power – Additional maintenance cost due to startup etc. Merit order

00: 00 01: 00 02: 00 03: 00 04: 00 05: 00 06: 00 07: 00 08: 00 09: 00 10: 00 11: 00 12: 00 13: 00 14: 00 15: 00 16: 00 17: 00 18: 00 19: 00 20: 00 21: 00 22: 00 23: 00 Daily load curve on 25 th April 2016 3000 2500 2000 Coal 1500 CEB Thermal IPP Thermal 1000 Wind 500 Hydro 0

Network Control • Monitor and control the System Voltage by monitoring voltages on the key bus bars – Biyagama – Kelanitissa – Pannipitiya – New Anuradhapura – New Galle • Regulate the power flow by changing the opening points of the network to match with the dispatch

NCRE Operations • Not dispatch • Can see as a reduction of demand • On feeding Tariff – Mini Hydro > 10. 00 Rs/k. Wh – Solar, Wind > 20. 00 Rs/k. Wh

Allegations Against CEB Engineers

CEB has 3900 MW installed capacity But cannot meet 2300 MW peak demand

Total Installed Capacity Maximum Non Firm Capacity Dispatchable Capacity avbl. Capacity In March Laxapana Complex Victoria Kothmale Randenigala Rantambe Ukuwela Bowatanna Upper Kothmale Samanalawewa Kukule ganga Small Hydro (CEB) CEB Themal Plants IPPs Small Power Producers 354. 5 346 210 201 122 50 50 36 40 40 40 150 120 75 75 16 20. 5 1504 1372 591 544 455. 5 346 60 0 0 11 0 120 0 0 1202 544 10 Total 772. 5 3933. 5 2965 2293

• CEB deliberately drawdown the reservoirs in 2016 Faster than any other year

GWh Storage Variation 2010 - 2016 1400. 0 2012 2013 2014 2016 2015 1200. 0 2011 1000. 0 800. 0 600. 0 2016 400. 0 200. 0 d-MMM d-MMM d-MMM d-MMM d-MMM d-MMM d-MMM

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