Tenders Are Invited For Hydro-Electric Plant Construction Work – Pumpspeicherwerk Grimsel 4 - Bauhauptlos

Hydro-Electric Plant Construction Work – Pumpspeicherwerk Grimsel 4 - Bauhauptlos. The Psw Grimsel 4 Uses The Existing Potential Between The Two Existing Reservoirs, Grimsel And Räterichsbodensee, With Two Machine Groups Without Additional Water. Due To The Short Distance Between The Two Lakes And The Existing Plant Components, An Economically Attractive Power Plant Can Be Realized With The Psw Grimsel 4. In Addition To The Reservoirs Mentioned, The Project Uses Other Existing Parts Of The System, In Particular The Development And Supply Systems Of The Existing Power Plants On The Grimsel, As Well As The Grimselsee Inlet Structure With Throttle Valve Chamber, Which Was Already Implemented In Connection With The Replacement Of The Spitallamm Dam (Pre-Investment In Grimsel 4). The New Structures To Be Constructed Generally Include The Continuation Of The Upstream Headwater System From The Throttle Chamber With A Flat Section And Pressure Shaft, The Cavern Center, The Underwater Headwater System With Underwater Tunnels And Outlet Structure As Well As Additional Development Tunnels. The New Power Plant Has A Total Output Of 150 Mw With An Expanded Water Volume Of 70 M3/S And Closes The Existing Bottleneck In The Hydraulic System Between Grimsel And Räterichsbodensee. In Addition, The Power Plant Also Serves For Lake And Tributary Management, Which Means That Water Losses During Floods Can Be Avoided And Make A Significant Contribution To Flood Protection. Thanks To Its Flexible Operation, The Psw Grimsel 4 Can React To Short-Term Network Fluctuations As Well As Cover Peak Loads In Circulation Mode. In Times Of Overcapacity In The Network, Excess Energy Can Be Absorbed And Stored. When Needed, The Stored Energy Is Available As Peak Electricity. This Means That Grimsel 4 Not Only Supports The Smoothing Of Load Profiles, But Also The Stabilization Of Voltage And Frequency In The Transmission Network. The Psw Grimsel 4 Is Also Able To Be Operated In A So-Called Hydraulic Short Circuit. Part Of The Pumped Water Is Immediately Turbined Again Without Completely Going Through The Storage Circuit. This Mode Of Operation Allows You To React Very Quickly To Changing Network Conditions Without Having To Interrupt Pumping Operations. This Significantly Increases The Power Plants Ability To Respond And Makes It An Extremely Valuable Tool In Modern Grid Operations. In Addition To Energy Production, Psw Grimsel 4 Also Offers System Services Such As Primary, Secondary And Tertiary Control. The High Flexibility Of The Pumped Storage Power Plant Makes It Possible To Provide Balancing Energy In The Shortest Possible Time, Which Is A Decisive Advantage Given The Increasing Volatility Of The Electricity Markets. With These Properties, The Psw Grimsel 4 Fulfills A Central Role In The Energy Transition And Makes A Significant Contribution To Security Of Supply And The Efficient Use Of Hydropower Resources

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