On June 3, the Resolution of May 23, 2023, of the Institute for Energy Diversification and Energy Savings Public Entity, MP, was published in the BOE, by which the Resolution of May 18 is published of 2023, which expands the budget of Royal Decree 691/2021, of August 3, for subsidies to be granted for energy rehabilitation actions in existing buildings, in execution of the Energy Rehabilitation Program for existing buildings in municipalities with a demographic challenge, included in the Regeneration and Demographic Challenge Program of the Urban Rehabilitation and Regeneration Plan