Helen commissions new battery energy storage system in Lohja to strengthen grid flexibility
Helen has commissioned a new battery energy storage system (BESS) at its Lohja solar farm. The facility enhances the use of renewable energy and increases the flexibility of the electricity system, at a time when the share of weather-dependent power generation has grown significantly.
The Lohja BESS has a maximum output of 5 MW and an energy capacity of 10 MWh. The lithium-ion system consists of 28 battery modules.
“Weather-driven solar and wind power generation requires more flexibility from the electricity system, and battery storage is an excellent way to provide this. The Lohja system is integrated into HelenFlex, Helen’s control platform that enables participation in Fingrid’s reserve markets. This is already Helen’s second large storage asset connected to the platform,” says Helen’s Project Manager Jesse Talasjoki.
Battery storage stabilises the grid and smooths price fluctuations
Battery storage systems help balance the grid and enable more efficient use of renewable energy. During sunny or windy periods, surplus energy can be stored and then discharged back into the grid when consumption increases or production drops. This helps mitigate price volatility and improves the reliability of the electricity system. The need for flexibility is also increasing among electricity users – including industry and households – through demand response.
The Lohja BESS continues Helen’s growing portfolio of storage projects. The company already operates battery storage systems in Nurmijärvi and at the Lakiakangas wind farm. The Lohja project has received support from Helen’s Environmental Penny and from the Ministry of Economic Affairs and Employment through the RRF programme, as part of the Lohja solar farm.
How does a battery storage system work?
- Stores renewable energy: Excess solar or wind power is charged into the storage system.
- Balances production and consumption: Energy can be discharged into the grid when demand rises or production falls.
- Stabilises the electricity system: The storage helps maintain the real-time balance between production and consumption.
- Reduces price volatility: The storage smooths fluctuations in electricity prices and strengthens security of supply.