If you are eligible then then make sure you apply sooner rather than later as it is first come first served and each energy company has a limited fund, it's worth £120 and can be for any kind of energy meter.
www.bbc.co.uk/news/business-15217004
"To be eligible most firms require customers to be in receipt of a means tested benefit, and either have a child under 5 or in receipt of disability benefit."