ORS § 90.375
If a landlord unlawfully removes or excludes the tenant from the premises, seriously attempts or seriously threatens unlawfully to remove or exclude the tenant from the premises or willfully diminishes or seriously attempts or seriously threatens unlawfully to diminish services to the tenant by interrupting or causing the interruption of heat, running water, hot water, electric or other essential service, the tenant may obtain injunctive relief to recover possession or may terminate the rental agreement and recover an amount up to two months' periodic rent or twice the actual damages sustained by the tenant, whichever is greater. If the rental agreement is terminated the landlord shall return all security deposits and prepaid rent recoverable under ORS 90.300. The tenant need not terminate the rental agreement, obtain injunctive relief or recover possession to recover damages under this section.
ORS 90.375