Frequently asked questions about Energy Savings Certificates.
The 100 most common questions about the processing and management of CAE, answered and organised into 10 thematic blocks. Based on the official FAQ document of MITECO's CAE System (v1.6, 23/04/2026), Real Decreto 36/2023 and its implementing orders.
Block 1 · 12 questions
Basic concepts
The essential questions for understanding the Energy Savings Certificates system: what a CAE is, what it is worth and which regulations govern it.
View answersBlock 2 · 10 questions
Who can benefit
Who the owner of the energy saving is and in which cases they can cede it in exchange for consideration.
View answersBlock 3 · 12 questions
Eligible actions and catalogue
Which energy-efficiency actions generate CAE and how the official catalogue of standardised datasheets works.
View answersBlock 4 · 12 questions
Requirements and conditions
Time windows, expiry and technical requirements that an action must meet to be certifiable.
View answersBlock 5 · 12 questions
Case-file documentation
The documents that make up a CAE case file and how they must be signed and kept.
View answersBlock 6 · 12 questions
Processing, verification and issuance
How a case file progresses from verification to the registration of the CAE in the National Registry.
View answersBlock 7 · 12 questions
Price, payment and taxation
How much is paid for a CAE, when it is collected and how the consideration is taxed under IRPF and IVA.
View answersBlock 8 · 6 questions
Compatibility with grants
When a CAE is compatible with public subsidies and tax deductions, and how to declare it.
View answersBlock 9 · 6 questions
System agents
The players in the CAE system and the accreditation requirements demanded by the National Coordinator.
View answersBlock 10 · 6 questions
Problems and complaints
How to resolve common issues: non-payment, tight deadlines, changes of Delegated Party and complaints.
View answers
Main sources: official FAQ of the CAE System, MITECO v1.6 (23/04/2026); Real Decreto 36/2023; Orden TED/815/2023; Orden TED/845/2023; Orden TED/133/2026; 2026 market references. This text is informational and has no legal value; the applicable regulations always prevail.
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