In 2013, Letter Ingenieros starts in Granada to offer a new energy efficiency consulting service. Three new offices have been opened: Palma, where the public lighting management of the City Council is managed. Also, energy audits, management of hotel groups, jobs for the Balearic Port Authority and among others are performed. Barcelona, ​​where the public lighting management of the city is managed, as well as other large-scale projects in the Metropolitan Area of ​​Barcelona. Lastly, Dubai where energy consulting services are starting in the sector of medical hospitals and others.

In addition, the brand has two other companies focused on renewable energy projects: Ohmio Recharge, dedicated to electric car charging systems and Walu Solar, for the management of large solar installations.