HOT|COOL NO. 1/2018 "Global District Energy Climate Awards"


In order to ensure efficient production and reduce gas consumption, three high-efficiency gas-water boilers were installed replacing the outdated Soviet-era equipment.

The gas boiler station before and after the upgrade

Fuel diversification

The boiler station was converted to full automation. The company has established a single heat measuring system that can provide the instantaneous load for each consumer, the heat carrier flow data, the heat source and heat transport energy efficiency indicators online. These measures make it possible to optimise the heat load, preventing heat losses in sections of the pipelines, and also encourage the consumers to save energy. Since 2016, the company has an LVS EN ISO 50001:2011 certified energy management system; the company monitors and analyses its energy efficiency performance. The company buildings have been renovated, greatly reducing the heating energy consumption. To partially cover own electric power consumption, 86 solar panels with a total capacity of 25 kW have been fitted on the roof of the building.

From 2008, the company was purchasing heat from the adjacent CHP plant running on natural gas, while the rest of the energy was produced using natural gas. To partially switch to renewable energy sources, a 7 MW woodchip boiler was commissioned in 2012. In order to increase energy efficiency and the effectiveness of the overall system, in 2015 it was decided to supplement the woodchip boiler with a 1.68 MW flue gas condenser. The company purchases woodchips with a 40-50% moisture level. Since the woodchips are so moist, the flue gas condenser recovers latent heat from the hot flue gas. The flue gas temperature before the condenser is an average of 160-170 o C, while after the condenser it is 45 o C. For example, in 2017, 32,438 MWh of energy was produced in 2017 and an additional 6,991 MWh recovered from the flue gas. Currently, 61% of the heat is produced using renewable energy resources – 50% from the woodchip boiler and 11% from the flue gas condenser. Until August 2017, 21% for the total amount of energy was purchased from the adjacent CHP plant, which is now closed.

Solar panels for electricity generation

Site of Salaspils Siltums before and after the construction of the woodchip boilers

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