The station is heated using a system which reuses rainwater.
A new police station has opened in north Kent at a cost of £30m.
The new building at Thamesway, near Northfleet, means Dartford and Gravesend stations will be closed.
It features a 40-cell custody suite, a vulnerable witness interview room, and a garage where cars can be tested by forensic scientists.
The station, built using the private finance initiative, is heated by a geothermal system which reuses rainwater.
Mark Gilmartin, of Kent Police Authority, said: "The old police stations were no longer fit for purpose and now we have an environmentally friendly station with fantastic equipment."