The request for proposals covers the calculation, design, construction, manufacture, testing, transportation, installation, commissioning, documentation, and warranty for several large power transformers (LPT), divided into a total of 4 lots as follows. Lot 1: 3 x Longitudinal & Quadrature regulated Transformer (LQT) 400 MVA, 380/220 kV LQT Soazza 1: 4 phases (1 transformer bank + 1 reserve group) LQT Soazza 2: 3 phases (1 transformer bank) LQT Tavanasa 1: 4 phases (1 transformer bank + 1 reserve group) The three transformer groups (phases) of a transformer bank each consist of an LRT and QRT in separate tanks. Lot 2: 4 x Longitudinal & Quadrature regulated Transformer (LQT) 800 MVA, 380/220 kV LQT Breite 1: 4 phases (1 transformer bank + 1 reserve group) LQT Breite 2: 3 phases (1 transformer bank) LQT Gösgen 1: 4 phases (1 transformer bank + 1 reserve group) LQT Gösgen 2: 3 phases (1 transformer bank) Lot 3: 2 x Phase Shifting Transformer (PST) 500 MVA, 220/220 kV PST Riddes 3: (2 tanks, 3-pole) PST St. Triphon 1: (2 tanks, 3-pole) PST with two cores, excitation and series transformers in separate tanks Lot 4: 1 x Longitudinal & Quadrature regulated Transformer (LQT) 400 MVA, 380/220 kV LQT Bickigen 1: (2 tanks, 3-pole) LRT and QRT in separate tanks For information on the earliest possible delivery dates for the individual LPTs, please refer to document 01_Verfahrensanweisung, Chapter 6.8.5, Mandatory Criterion LPT-MK5 – Latest Possible Dates for “IBS Completed,” and Chapter 6.9.6, Evaluation of the Award Criterion LPT-ZK4 – Date “IBS Completed,” in the bidding documents. Legend: LRT → Longitudinal regulated transformer QRT → Quadrature regulated transformer 3 phases → Transformer bank 1 phase → Transformer group (LRT+QRT) LRT / QRT → Transformer Reserve group → Reserve phase

3 x Longitudinal & Quadrature regulated Transformer (LQT) 400 MVA, 380/220 kV

This lot includes the calculation, design, construction, manufacture, testing, transport, assembly, commissioning, start-up, documentation and warranty of 3 large power transformers (LPT): 3 x Longitudinal & Quadrature regulated Transformer (LQT) 400 MVA, 380/220 kV LQT Soazza 1: 4 phases (1 transformer bank + 1 reserve group) LQT Soazza 2: 3 phases (1 transformer bank) LQT Tavanasa 1: 4 phases (1 transformer bank + 1 reserve group) The three transformer groups (phases) of a transformer bank each consist of an LRT and QRT in separate tanks.

4 x Longitudinal & Quadrature regulated Transformer (LQT) 800 MVA, 380/220 kV

This lot includes the calculation, design, construction, manufacture, testing, transport, assembly, commissioning, start-up, documentation and warranty of 4 large power transformers (LPT): 4 x Longitudinal & Quadrature regulated Transformer (LQT) 800 MVA, 380/220 kV LQT Breite 1: 4 phases (1 transformer bank + 1 reserve group) LQT Breite 2: 3 phases (1 transformer bank) LQT Gösgen 1: 4 phases (1 transformer bank + 1 reserve group) LQT Gösgen 2: 3 phases (1 transformer bank) The three transformer groups (phases) of a transformer bank each consist of an LRT and QRT in separate tanks.

2 x Phase Shifting Transformer (PST) 500 MVA, 220/220 kV

This lot includes the calculation, design, construction, manufacture, testing, transport, assembly, commissioning, start-up, documentation and warranty of 2 large power transformers (LPT): 2 x Phase Shifting Transformer (PST) 500 MVA, 220/220 kV PST Riddes 3: (2 tanks, 3-pole) PST St. Triphon 1: (2 tanks, 3-pole)

1 x Longitudinal & Quadrature regulated Transformer (LQT) 400 MVA, 380/220 kV

This lot includes the calculation, design, construction, manufacture, testing, transport, assembly, commissioning, start-up, documentation and warranty of 1 large power transformer (LPT): 1 x longitudinal & quadrature regulated transformer (LQT) 400 MVA, 380/220 kV LQT Bickigen 1: (2 tanks, 3 poles) LRT and QRT in separate tanks