Almost 27,200 home energy upgrades were completed last year - an 80% increase on 2021 - according to the Sustainable Energy Authority of Ireland.
The number of homes upgraded to a B2 Building Energy Rating (BER) has also increased to 8,481 last year, up from 4,345 in 2021 and 2,423 in 2019.
The total number of homes upgraded to B2 over the last four years stands at 18,527.
The National Retrofit Plan has set a target of 500,000 homes upgraded to a B2 by 2030 target and some pubic representatives say the SEAI is not on course to meet it.
Climate Spokesperson for the Social Democrats, Wicklow TD Jennifer Whitmore, said: "The Government must stop misrepresenting figures and patting itself on the back for failure.
"The reality is the number of deep retrofits that are being carried out each year is incredibly low – and nowhere near sufficient to reach our targets.
"The Government is failing miserably to achieve its own retrofitting targets.
"It must now tell us how it intends reaching its target of 500,000 homes upgraded to a BER 2 level by 2030 – given more than 480,000 homes need to be upgraded in the next seven years."
This latest report from the SEAI says that last year capital expenditure on retrofits, carbon emissions saved, fully funded upgrades for low income households and the number of energy upgrades completed, were all up at least 80% on 2021.
The figures from the SEAI's 2022 report also reveals that the organisation processed more than 50,000 grant applications, an increase of 140% on the previous year, showing that demand grew faster even than supply.
While it is no surprise that both demand and supply last year were higher as the country reopened following Covid, they are also now above the 2019 levels as are all the key indicators for the SEAI.
The capital spend on the National Retrofit Programme for 2022 came to €188m - up 90% on 2021 and much higher than the €103m spent in 2019.
Dr Ciaran Byrne, Director of National Retrofit at the SEAI, said: "It is evident from this report that momentum in applications and delivery of home upgrades built steadily through the year.
"However, the factors driving uptake of home energy upgrades including increased grant levels, One Stop Shop service launch, cost of living and energy crises, were somewhat offset by the impacts of inflation, labour shortages and supply chain delays on contractors' ability to capitalise on the demand."
Minister for Environment, Climate and Communications Eamon Ryan said: "Momentum in retrofit is building.
"SEAI supported 15,000 home energy upgrades in 2021, 27,200 last year and will deliver 37,000 this year.
"I have confidence we will meet this target given the strong pipeline of work in place."
The SEAI said 4,438 fully funded upgrades for low-income households were completed last year, up 85% on 2021.
Labour shortages and supply chain delays meant supply of energy upgrades did not keep up with demand and some of these difficulties will persist this year and into the medium term when the retrofit programme will have to see even bigger rises in output to meet targets.
