Regarding Communications the Department's responsibilities cover electronic communications, television distribution, radio spectrum and postal services.

• Communications Development Division - to promote the provision and development of competitive high quality and world class services in the communications, electronic and mobile commerce sectors.
• Business and Technology - to focus on new Business and Technology Applications and to develop policies, initiatives and legislation as appropriate.
• Regulatory Affairs - the development of effective policies for the regulation of the electronic communications sector and management of the radio frequency spectrum.
• Postal - to develop an effective policy for the Irish postal sector based on open market principles.

The Department has a wide range of roles and functions in the areas of maritime transport, public safety, environmental protection and coastal zone.

Regarding Natural Resources the Department has two chief divisions. The Petroleum Affairs Division aims to maximise the benefits to the State from exploration for and production of indigenous oil and gas resources, while ensuring that activities are conducted safely and with due regard to their impact on the environment and other land/sea users. The Exploration and Mining Division of the Department is charged with:

• the application of the Minerals Development Act to minerals exploration and development;
• the encouragement of the early identification and responsible development by private investors of the Nation's minerals deposits in accordance with best international practice
• enhancing the attractiveness of Ireland for international and national minerals investment by active promotional measures.

1 Minister for Fisheries 1921-1930

2 Minister for Lands & Fisheries 1930-1937