It is hoped that 50 solar-powered fridges will be sent from Powys to the earthquake-hit region of Kashmir.
A field hospital in a tent city in Muzaffarabad, Pakistan
They will store drugs and blood for victims of the disaster, which also struck Pakistan and parts of India earlier this month.
Major aid organisations have paid renewable energy company Dulas, in Machynlleth, for the equipment.
Company director Ian Draisey said he had received verbal confirmation of the order and hoped for the final go ahead.
Dulas, which supplies developing countries worldwide, said the vaccines were "incredibly expensive" and had to be kept within a strict temperature range.
"These 50 solar fridge systems will support measles and vitamin A campaigns in the city of Muzaffarabad," said Dulas overseas operations director, Guy Watson.
"We have had one of the company's busiest years in respect to fridge production and water supply, and are happy to have the extra capacity to meet this immediate demand for Kashmir."
The company's work has been praised by First Minister Rhodri Morgan who said Dulas continued to "blaze a trail in environmental engineering".
"Now that technology will be used to help the many thousands of people in Kashmir in the most desperate need," he said.
"We should all be very proud that innovative technology developed here in Wales will play such an important role in the aid operation in Kashmir."