A man has been arrested on suspicion of drugs offences after officers raided a house in Eckington.
They struck on Market Street and discovered more than 40 cannabis plants and growing equipment.
Officers said an electric meter in the property had also been bypassed.
A 27-year-old man arrested at the scene was later bailed pending further inquiries.
Anyone with information about drug dealing or activity in Derbyshire should call Derbyshire Police on 101.
Crimestoppers can also be contacted, anonymously, on 0800 555 111.