Ceredigion council's office is in Parc y Llyn in Aberystwyth
A new £15m council office which will be home to more than 400 workers has opened in Aberystwyth.
Canolfan Rheidol will bring a number of Ceredigion council's departments under one roof after being located in separate offices in the town.
The building will be partially powered by a small wind turbine and solar panels, funded by a £313,000 grant from the Energy Saving Trust.
The Welsh Assembly Government opens a new office next door in October.
Ceredigion council said the building would "offer greater efficiency and accessibility to services".
The development took nearly 18 months to build, and the council said the project was completed on time and on budget.
The departments of finance, social services, education and community services, environmental services and housing, and highways property and works will be located at the new offices.
Canolfan Rheidol was opened by council chairman Councillor J Ivor Williams.