The Daugava HPPs are the biggest hydropower plants in the country, providing a large share of renewable energy not only in the Group, but also in Latvia as a whole.
The ability of the Daugava HPPs to generate electricity depends on the water inflow in the Daugava River. In years with normal inflow levels, the HPPs can operate at full capacity during the spring flooding season, which lasts for about one to two months annually. During this period, the water volume may exceed water inflow during low water periods (mainly during the summer months) more than ten times. During the spring flooding, it is possible to cover the demand for electricity of all Latvenergo Group's customers and trade the excess on the Nord Pool exchange. Outside the flooding season, the Daugava HPPs provide for the possibility to accumulate water and generate electricity when the demand and prices on the exchange are higher.
In 2018, the Daugava HPPs generated nearly 2.4 TWh of electricity, which constituted 47% of the Group's total electricity output. The electricity generation in 2018 was 44% lower than in the previous year due to significantly lower water inflow in the Daugava River. In the reporting year, investments in the Daugava HPPs' assets amounted to EUR 24.4 million, including EUR 21.1 million invested in the programme for the reconstruction of hydropower units, which will ensure their operation at least for the next 40 years. The programme provides for the reconstruction of 11 hydropower units, of which four have already been modernised. The reconstruction process is scheduled for completion in 2022, and the total cost of the programme is expected to exceed EUR 200 million.
Replacement of outdated hydro turbines contributes to an increase in their capacity, efficiency rate and electricity output. This promotes reliable, efficient and competitive operations of the Daugava HPPs within the overall energy system and in the electricity market. More efficient use of water resources mitigates the negative impact of the Group on climate change. Each megawatt hour of electricity generated by the Daugava HPPs reduces CO2 emissions by 0.345 t/MWh, assuming that this energy would otherwise be generated in condensation mode at combined heat and power plants by using natural gas as fuel.
Plavinas HPP Start of operations 1968 Capacity 908 MW Hydropower units 10 Energy source water
Plavinas HPP is the largest hydropower plant by installed capacity in the Baltic states and one of the largest in the European Union. It plays an important role in ensuring the stability of the Baltic power system in the event of unplanned outages or accidents at base plants. Plavinas HPP also serves as a synchronous compensator for voltage regulation in high voltage electricity networks.
In 2018, Plavinas HPP generated 1,359 GWh of electricity, which is 57% of the amount generated by the Daugava HPPs.
Riga HPP Start of operations 1974 Capacity 402 MW Hydropower units 6 Energy source water
Riga HPP is the newest of the Daugava hydropower plants. It also serves as a synchronous compensator for voltage regulation in high voltage electricity networks.
In 2018, Riga HPP generated 564 GWh of electricity.
Kegums HPP Start of operations 1939 Capacity 248 MW Hydropower units 7 Energy source water
Kegums HPP is the oldest Daugava hydropower plant. It consists of two separate power plants built at different times on the right and left banks of the Daugava River.
In 2018, Kegums HPP generated 457 GWh of electricity.