However, Lord Smith of Kelvin said the bank, which will have headquarters in Edinburgh, is unlikely to invest in some technologies on which many in Scotland are pinning their hopes.
In a briefing in Edinburgh, Lord Smith said the Government hopes to get European Union clearance to launch this autumn but has already developed a pipeline of potential investment opportunities.
"We will proceed cautiously but I do think we will get the money out the door and out commercially," he said.
"We have five priority areas," explained Lord Smith, who also chairs Weir Group and Scottish & Southern Energy. "Offshore wind power generation; commercial and industrial waste processing and recycling; energy from waste generation; non-domestic energy efficiency and we've got to support the Green Deal [introduced by the Government to encourage homeowners to invest in energy efficiency]."
The list omits wave and tidal power, which have generated lots of excitement in Scotland.
On Wednesday, First Minister Alex Salmond told an audience in America that there are more wave and tidal devices around Scotland than in the rest of the world combined.
Lord Smith said the bank had not ruled out investing in either technology but added: "Wave and tidal technology is quite a way away and so is carbon capture and storage, just a wee bit far away during my three- year period from becoming commercially viable. That's real venture capital stuff."
But Lord Smith expects Scotland to reap significant benefits from the bank's activity.
"I don't want to see people from outside come in, put up wind turbines made by them outside this country, serviced from outside.
"I would like to see a supply chain built up here – so Scotland and the UK build up this knowledge about green energy and saying to the rest of the world 'we're ahead in this area and we're exporting that expertise'."
Lord Smith's team is looking for a suitable home in central Edinburgh for a bank he expects to attract global interest as the first of its kind.
He expects the bank to employ about 40 people in Edinburgh.
These will include staff in head office functions and a transaction team.
The bulk of the transaction work will be run from London, where about 70 staff will be based.
"The beauty of having something in London is it's the financial centre for the world," said Lord Smith.
Asked what would happen to the bank if Scotland votes for independence in 2014, he said: "I don't know the answer to that."
However, Lord Smith is confident that if the bank performs well, people will want to preserve it.
The bank's operational independence will be enshrined by statute.
Lord Smith expects the bank will invest mainly in big projects requiring multimillion-pound investments.
It has sub-contracted fund managers to invest in smaller waste and energy efficiency projects.
The bank has been charged with making a return on the £3bn capital provided by the Government, "vaguely set at 3.5%".
But Lord Smith emphasises the organisation's roles also include acting as a catalyst to encourage others to invest in green projects.
"If I can turn around (after the initial three-year term) and say lots of other institutions are now in this area big time, competing with us, I'll feel the job is very well done."
The marine energy action plan, developed by the wave and tidal power industry in Scotland, published yesterday, highlights the challenges firms face in raising the funding required to commercialise technology.