In 2018, the combined power output of the Olkiluoto units, OL1 and OL2, was 14,089 GWh. The combined load factor of the plant units was 91.1%. TVO produced approximately 16% of all the electricity consumed in Finland.
The plant units operated safely. The net output of OL1 was 6,755 GWh and the load factor was 87.8%. The net output of OL2 was 7,334 GWh and the load factor was 94.3%.
| Net production (GWh) | 6,755 | 7,158 | 7,048 | 7,397 | 7,266 |
| The plant units own electricity consumption (GWh) | 246 | 264 | 258 | 270 | 266 |
| Capacity factor (%) | 87.8 | 93.1 | 91.4 | 96.2 | 94.5 |
| Efficiency (net) (%) | 35.3 | 35.1 | 35.0 | 35.0 | 35.0 |
| Net production (GWh) | 7,334 | 6,256 | 7,301 | 6,864 | 7,497 |
| The plant units own electricity consumption (GWh) | 264 | 226 | 265 | 248 | 270 |
| Capacity factor (%) | 94.3 | 81.3 | 94.6 | 89.2 | 97.4 |
| Efficiency (net) (%) | 35.4 | 35.4 | 35.1 | 35.1 | 35.1 |
Improving energy efficiency
TVO has for several years participated in the voluntary Finnish Energy Efficiency Agreement for Industries. For the first time TVO signed the Agreementin 1998. Efforts have been focused on the continuous improvement of energy efficiency at the plant units and in the Olkiluoto area, as required by the Agreement.
TVO continued in the Energy Efficiency Agreement also for the period of 2017-2015, in which the associated Action Plan for Energy Production aims to implement actions designed to make the use of energy more efficient, and to improve the efficiency of primary energy use as well as the total efficiency of energy production. TVO's total energy savings target for the years 2017–2025 is 150 GWh which equals the average annual consumption of about 7,500 single family homes heated with electricity.
Energy efficiency measures carried out in 2018 include the renewal of the main coolant pumps and turbine condensers at OL1. In addition, the north gate building has been demolished. Inspections of Olkiluoto buildings continued in 2018. Measurements and energy analyses were also performed in both existing plant units after the annual outages.
TVO carries out activities related to energy efficiency as part of normal operations. For TVO, the highest potential for savings is related to the improvement of the efficiency of the electricity production process; this has been implemented according to long-term plans throughout the operational history of the Company through plant modernisation projects. Another area for improvement of efficiency is the reduction of own energy consumption in the Company's area in Olkiluoto. TVO's environmental management system includes energy efficiency system EES+ as an integral part; it is used to make the continuous improvement of energy efficiency more systematic throughout the organisation.
