HELSINKI (Reuters) – Some 3,000 workers at Finnish forestry group UPM went on strike on Saturday, shutting plants, the company said on Saturday.

Three unions representing paper workers, managerial staff and electricians had previously warned they would strike if a new agreement about wages and working conditions was not reached before the previous agreement ended on Dec. 31.

UPM quit collective bargaining a year ago together with other forestry employers, saying the industry wants to improve profitability by seeking alternative ways to agree on wages and working conditions.

While workers have demanded UPM signs a company-wide labour agreement, the company has pushed for business-specific agreements and signed them with its plywood and timber divisions.

Workers in UPM’s pulp, paper and biofuels businesses have said UPM wants to dictate new conditions instead of negotiating, the three trade unions have stated.

The strike will end on Jan. 22 unless an agreement is reached before that, the trade unions previously said in separate statements.

Inderes analyst Antti Viljakainen earlier told Reuters UPM could expect the cost to be at least twice as big as the 30 million euros ($34 million) caused by a previous strike in 2020.

UPM rival Stora Enso has signed a company-wide agreement with the workers’ unions.

($1 = 0.8797 euros)

(Reporting by Essi Lehto, Editing by Louise Heavens)