Energy efficiency

We systematically conduct activities to increase efficiency in energy use. These include improving energy efficiency in PSE's operations and real property maintenance, as well as implementing environmental awareness campaigns for our employees.

Actions performed successively at PSE include:

• replacement of lighting fixtures with LED fixtures,
• modernization of plant and lighting control systems,
• installation of a UPS for the server room.

All of these actions are successively contributing to improving energy efficiency throughout the organization.

In 2020, 300 2x26 W downlight fixtures were replaced with new DN060B LED18S/840 PSU WH LED fixtures of 18 W each.

The task was intended to reduce energy consumption by using energy-efficient LED fixtures and replacing old, out-of-stock fixtures with new, widely available ones.

Assuming an average operating time of 6 hours per day, the fixtures replacement resulted in a total annual savings of 22 MWh.

Objectives of the task:

• Excluding the power supply of the server room from the operation of the fire switch.
• Improving the power supply safety.
• Installation of the unit with higher energy performance.

In 2021, a UPS was installed for the server room -217-W and the number of battery strings was increased in selected server rooms at the PSE headquarters in Konstancin-Jeziorna. In addition to the effects relevant to the organization in the form of a significant improvement in power supply safety, the task resulted in a significant reduction of electricity losses. The modern UPS unit currently installed in the server room has been designed using different technology and features much higher energy conversion efficiency, which equates to reduced cooling requirements.

The increased efficiency and lower cooling demand translate into electricity savings of about 15 MWh per year.

Water purchases for PSE employees were limited in 2020. Employees who worked remotely did not place orders for deliveries of bottled water.

• The decrease in plastic bottle water consumption was 38 percent over the year (In 2019, 449,208 pieces of plastic water bottles were purchased and 275,234 pieces were purchased in 2020).
  In terms of liters, this means 260,460 liters of water in 2019 and 163,129.4 liters in 2020.
• At the same time, purchases of water in glass bottles decreased from 14,572 pieces in 2019 to 10,612 pieces in 2020, which means per liter of water, respectively: 4,545 liters in 2019 and 1,264 liters in 2020. The decrease in glass water bottles consumption was 72 percent.