The Government will today unveil its next infrastructure investment plan, which will outline which projects will be the top priorities in the next few years.

It is the second release of the national infrastructure plan, after an initial release in March last year.

Today's release will include the national outlook for the next 20 years, and the expected level of investment in the coming years, accounting for the Canterbury earthquakes.

In its last report, the Government said its five most important priorities were broadband, electricity transmission, regulatory reform, roads of national significance, and the Rugby World Cup 2011.

Infrastructure is one of National's six planks of economic growth, with cutting red tape and regulation, business innovation and trade, education and skills, improved public services, and tax reform.