The UK government wants to centralise much of its web hosting onto infrastructure built by managed services firm Loudcloud.
Last November, the government outsourced operation of the ukonline.gov.uk portal to Loudcloud, and development of the new infrastructure is now complete.
The portal gets around one million hits per week.
Alan Mather, chief executive of the e-delivery team at the Office of the e-Envoy (OeE), said it would be cheaper and more efficient for more departments to use the same system.
"There are big economies in security and scalability; how many firewalls does the government need, is the question to ask. We are talking to the departments but they are all at different points in the [procurement] cycle and we need to come in at the right point."
There are hundreds of different government websites, and departments can make their own decision about how they are built and managed.
Mather said that not all websites will be migrated to a single infrastructure. "There won't be a single government front-end. There's a finite number of departments we can migrate and sometimes it will be more expensive to move them than to leave it where it is.
"Departments have the final decision. We aren't pushing them in one direction - we are making them an offer."
Loudcloud chairman Marc Andreessen said the government is facing the same problem as many large businesses: "There are lots of big companies with hundreds of different internet installations and every large company is looking to consolidate them. A lot of work will go into consolidation and we see this as a large opportunity."
The OeE is planning to launch an interactive digital television version of the ukonline.gov.uk portal this year. It is soon to start a trial of the technology.
"It is pretty complex and we have to sort the technical issues to make sure it is presentable in the same way across the different platforms. There will be a single content engine that will deliver content to each device," said Mather.
Mather said future developments include building relationships with third parties who can deliver government services - such as car insurers who could also provide tax discs - and making the portal more proactive, for example warning users that they could apply for additional benefits.
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