UK aid donations to the Asian tsunami appeal have reached £76 million, the Disasters Emergency Committee has said.
Public contributions are expected to top £100 million, the umbrella group of charities predicted.
The announcement came as foreign secretary Jack Straw said there was "no cap" on the amount of aid the UK government would offer.
Government Response: Department for International Development
Hilary Benn, international development secretary, said: "Our teams have reported back on the increasing scale of destruction and loss of life. We have pledged £50 million based on their assessment of the need and in response to requests from the Red Cross, UN and UK aid agencies.
"We are now committing this money to support the relief effort. This will be the largest humanitarian relief operation in history and it is important every country does all it can. The UK has made a substantial commitment and we will do more as required."
Stakeholder Response: Energy Networks Association
Nick Goodall, chief executive of ENA, said "Rebuilding electricity infrastructure is
a complex engineering task.
"We are liaising with both the UK government and those in the affected region, local power companies and other agencies to identify projects vital for re-connecting the supply of electricity."
Stakeholder Response: Help the Aged
Eleanor Barker, international manager for Help the Aged, said: "Help the Aged having been working through partners for sometime in both South India and Sri Lanka. These community programmes allowed us to respond to the disaster very quickly.
"Our work now in both regions is to continue to deliver aid that older people and their families need. In the longer term, we will be helping older people and their families rebuild their communities and livelihoods".
Stakeholder Response: Stagecoach Group
Brian Souter, Stagecoach group chief executive, said: "The scale of the human tragedy caused by this disaster has touched the hearts of our employees and everyone wants to respond to the tremendous need.
"Many of our employees have already started fund-raising efforts, including some who are donating a day’s salary to the disaster appeal. As well as making a charitable donation, Stagecoach has also pledged to match pound for pound the fund-raising efforts of our people."
Stakeholder Response: Rotary International
Gordon McInally, president of Rotary International in Great Britain and Ireland, said: "The earthquake and subsequent tsunami is arguably the greatest natural disaster to befall our planet in the 100 years of Rotary's existence.
"Many Rotarians have been affected by the disaster, both in the area involved and also here within Great Britain and Ireland, where Rotarians have lost family and friends.
"The response to the disaster by Rotarians has been phenomenal - hundreds of Rotary Clubs have held collections in shopping centres, at motorway service stations and at sports stadiums. The public response has been incredible and thousands of pounds have been raised, thanks to the generosity of the public and to the generosity of Rotarians and their families and friends in giving time to collect that money.
"Perhaps more importantly a great deal of tangible aid has already gone to the disaster area in the shape of Rotary Shelter Boxes and Rotary Aquaboxes providing essential shelter and clean water.
"The need, however, remains immense and Rotary in Great Britain and Ireland has designated Saturday January 8, 2005 'Rotary Tsunami Disaster Collection Day' when Rotary Clubs will organise further fund raising."
Stakeholder Response: World Vision
Charles Badenoch, chief executive of World Vision UK, said: "This is the greatest human emergency of our time.
"World Vision has mobilised its entire international network to help, both in the relief work across the affected countries and in raising vital funds.
"We are raising funds in Australia, New Zealand, Canada, the US and Hong Kong as well as through our membership of the umbrella organisation for UK aid agencies, the Disasters Emergency Committee.
"We have been in these countries for more than four decades, We will stay in these stricken communities as long as it takes to help people rebuild their lives. This is a marathon, not a sprint.
"World Vision will continue to work until these communities can get back on their feet.
"World Vision has been working in this region for about a half century, and we’re not going anywhere. We're in it for the long haul."
Stakeholder Response: Big Lottery Fund
Sir Clive Booth, chair of the Big Lottery Fund said: "It was very important to my Board that we respond quickly and effectively to public opinion that Lottery Money should be used to support the communities shattered by the Tsunami Earthquake. Money is not just needed now, but long into the future and Lottery players can be confident this funding will continue to play an important role in the reconstruction of these devastated areas for years to come."
"The Big Lottery Fund has a long tradition of funding UK charities doing vital work overseas in the world's most needy areas. We are very pleased to be able to add to the significant sums of money donated by the British public and the Government that will help the people in regions affected by this terrible disaster to rebuild their lives."
