Extension of Pumped Storage Plant Waldeck 2 in Northern Hesse / Germany

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Antonia Quinn
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1 Upper basin Waldeck 2 + Waldeck 2+ Upper basin Waldeck 1 Bringhausen 70 MW Waldeck MW 2+ 2 Waldeck MW 2+ 2 Lower basin Waldeck Group 1 Waldeck 1 70 MW 1 Germany Extension of Pumped Storage Plant Waldeck 2 in Northern Hesse / Germany Martin Rau E.ON Kraftwerke GmbH SHF Conference Grenoble April 10, 2014

2 Agenda Introduction Existing facilities Overview of the planned extension Waldeck 2+ Location of the new cavern Waldeck 2+ Machine concept and design capacity of the new plant Cavern concept Use of existing upper and lower basins Project status and outlook 2

Introduction PSP were originally designed for providing peak-load and to profit from daily spreads Now PSP were increasingly used for the provision of system services Enormous construction of wind

3 Introduction PSP were originally designed for providing peak-load and to profit from daily spreads Now PSP were increasingly used for the provision of system services Enormous construction of wind and solar powerplants are a result of the incentivizing renewal energy act (EEG) in Germany Storage of energy and a provision of high capacities on short notice is important to secure the power system and electricity supply E.ON reviews the option to extend pumped storage power plant Waldeck 2 Pumped storage power plants in a changing climate Typical operation in the past One pump cycle and two to three turbine cycles per day 00:00 turbine operation 04:00 turbine operation pump operation 08:00 pump operation 12:00 16:00 18:00 00:00 Typical operation today Much more operating hours, a greater number of operating mode changes and pump operation in the afternoon 00:00 04:00 08:00 12:00 16:00 18:00 00:00 examples from operation Waldeck 2, engine no. 5 3

Existing facilities Edersee 3 HPP Hemfurth 2 1 PSP Waldeck 2 PSP Waldeck 1 4 HPP Affoldern Deutschland Upper basin Waldeck 1 Upper basin Waldeck 2 Lower basin Waldeck Group 1 2 3 4 PSW Waldeck 1 (140

4 Existing facilities Edersee 3 HPP Hemfurth 2 1 PSP Waldeck 2 PSP Waldeck 1 4 HPP Affoldern Deutschland Upper basin Waldeck 1 Upper basin Waldeck 2 Lower basin Waldeck Group PSW Waldeck 1 (140 MW) PSW Waldeck 2 (480 MW) HPP Hemfurth (20 MW) HPP Affoldern (2,8 MW) When planning the Waldeck 2 scheme in the 1960s, a future extension of the plant had already been considered and the basins were designed accordingly. 4

5 Overview of the planned extension Waldeck 2+ Existing cavern Waldeck 2 Existing Planned Planned cavern Waldeck 2+ 5

Existing cavern and tunnels Planned cavern and tunnels Exploration tunnel

6 3,0 m 6,5 m Geological Investigations Existing cavern Waldeck 2 Cross section access tunnel and exploration tunnel Planned cavern Waldeck 2+ Existing cavern and tunnels Planned cavern and tunnels Exploration tunnel Geological main fault Rubblestone/Sandstone Exploration boreholes (depth up to 360 m) 6

7 Geological Investigations Excavation of exploration tunnel, Feb 2012 Investigations confirmed the geologists assumptions 7

8 Machine concept and design capacity of the new plant Investigation of numerous layout and design options Parameters considered in detail Design capacities between 200 MW and 400 MW One- and two-machine concepts Different design discharges (with or without extension of the basins) Different types of machines: - pump-turbines with synchronous generator (without speed control) - pump-turbines with asynchronous generator (with speed control) - ternary machine sets (3-machine sets) Comprehensive studies of economic viability and technical feasibility Optimal solution for Waldeck 2+: Reversible, variable speed pump-turbine with a rated power of 300 MW By combining the two existing ternary machine sets with the new variable speed pump-turbine the total system can be used much more flexible. 8

9 Machine concept and design capacity of the new plant Waldeck 2 (existing facility) Waldeck 2+ (planned facility) Pressure head 330 m 330 m Design capacity 2 x 240 MW = 480 MW 300 MW Machine type 2 ternary machine sets consisting of turbine, motor generator and pump Reversible pump-turbine with asynchronous generator (pumping capacity variable between 200 and 300 MW) rpm 375 min min -1 Design discharge Q Turb 2 x 80 m³/s 105 m³/s Grid connection 380 kv 380 kv 9

could be considerably reduced from 89,000 m³ down to

10 Cavern concept Machine and transformer are housed in the cavern powerhouse Excavation volume of cavern could be considerably reduced from 89,000 m³ down to 55,000 m³ dimensions now L/W/H = 68.00/27.00/48.45 m 10

11 1.5 m Use of existing upper and lower basins Upper basin Actual status Extension of water volume for m³ (extension by 11 %) Maximum water level will be increased for 1.50 m Planned extension 3.0 m Raising of the crest for 0.50 m Wave protection with steel parts on the crest New highest water level Existing highest water level Existing top of the dam Lower basin Maximum water level is increased by 0.10 m, minimum water level is simultaneously reduced by 0.10 m 11

charge (GW) Project status and outlook The current German energy market does not provide sufficient investment security for the planned extension E.

12 charge (GW) Project status and outlook The current German energy market does not provide sufficient investment security for the planned extension E.ON has postponed the investment decision for the main project Peak-Shaving due to feed-in of subsidized renewable energies reduce profitability of PSP dramatically shift of charge as a result of PV-feed-in ordinary summer day (h) At present there is no market for system stabilization Source: Godde + Engels (2013) However: The increase of the upper basin s dam will start as a first sub measure in May

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