Tool · Greece

Permit deadline calculator: the dates a Greek renewable project cannot miss

Every permit of a Greek solar, wind or storage project runs on its own clock. An environmental terms decision (ΑΕΠΟ) issued on 15 March 2022, for example, expires on 15 March 2037, but its renewal counts as timely only if it is filed by 15 January 2037. Enter your own dates below to see each deadline, how many days are left and the provision behind it, and add them to your calendar. Nothing you type leaves your browser.

Last updated: 22 October 2026 · Also in Greek: Υπολογιστής προθεσμιών αδειοδότησης: οι ημερομηνίες που δεν πρέπει να χάσει ένα έργο ΑΠΕ

Environmental terms decision (ΑΕΠΟ)

Date of issue

Term written in the decision (years)

Environmental management system

Installation Licence

Date of issue

Project

A public procurement tender is needed to build the project (1 more year)

Days under a court-ordered suspension

Maximum generation capacity (MW), for the extension fee

Final Connection Offer (stations with a Producer Certificate)

Date granted

Deadline	Date	Days left	Provision
ΑΕΠΟ expires			Law 4014/2011, art. 2(8)(α) and (β)
Last day to file the ΑΕΠΟ renewal in time			Law 4014/2011, art. 5(1) and (4): at least two months before expiry
This ΑΕΠΟ was issued before Law 4685/2020 (7 May 2020). Its term reaches fifteen years from issue only on a solemn declaration by the project owner, and only if the data on which it was issued have not changed in substance (art. 2(8)(γ)).
Installation Licence expires			Law 4951/2022, art. 19(1) to (3) and (5)
Latest end with the full 12-month extension			Law 4951/2022, art. 19(4): a written declaration and EUR 1,000 per MW for each month of extension
Final Connection Offer expires; complete applications for the Connection Agreement and the Installation Licence must be filed by then			Law 4951/2022, art. 5(16), as replaced by Law 5299/2026, art. 14(2)
Next Producer Certificate window			ΥΠΕΝ/ΔΑΠΕΕΚ/114746/4230/2020, art. 5(1)

How the calculator works

Every term comes from the renewables permitting calendar for Greece, where each one is cited to the provision behind it. A term in years or months ends on the same calendar day that many years or months after the date you enter.
The ΑΕΠΟ is valid for fifteen years unless the decision sets a shorter term with reasons, so enter the term written in your decision. ISO 14001 adds four years and EMAS six, by a declaratory act and for as long as the system stays in force.
The Installation Licence runs for three years, four for Special Projects, and one more year where a public procurement tender is needed. Time under a court-ordered suspension does not count, so the days you enter are added. An extension of up to twelve months costs EUR 1,000 per MW of maximum generation capacity for each month. Two cases go further than the date shown: a station selected for operating aid in a competitive tender keeps its licence until its connection-activation deadline (art. 19(6)), and the licence stays in force past its date once an application for temporary connection, a readiness declaration or an application for an Operation Licence has been filed while it was valid (art. 19(7)).
The Final Connection Offer of a station with a Producer Certificate runs for three years from the day it is granted. PV stations exempt from the Producer Certificate run on a different clock, set out in the calendar, so the calculator does not compute it for them. If the Installation Licence is issued while the offer is valid, the offer and the connection agreement are extended to the licence's expiry, on the conditions the law sets.
Producer Certificate applications are filed from the 1st to the 10th of February, June and October; the calculator shows the window that is open or the next one.
The calendar file holds one all-day event per date, each with a reminder 30 days before. It is built on your device; nothing is stored or sent.

How MitOS sees it

MitOS, by Ariadne Labs, puts all these deadlines into a 90-day calendar with a live alert feed, and raises the flag while you still have time to act, not after the time has passed. Each clock is kept separately, with the grant date and the regime of each project, because one offer's three years are not another's eighteen months.

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Frequently asked questions

How long is an ΑΕΠΟ valid in Greece?

Fifteen years from issue, unless the decision sets a shorter term with reasons (Law 4014/2011, art. 2(8)). An environmental management system extends it: four years for ISO 14001 and six for EMAS, by a declaratory act.

When must an ΑΕΠΟ renewal be filed?

At least two months before the ΑΕΠΟ expires. Only a renewal filed in time keeps the existing ΑΕΠΟ in force until the renewal decision is issued (art. 5(4)).

How long does an Installation Licence last?

Three years, or four for Special Projects, with one more year where a public procurement tender is needed. It can be extended by up to twelve months for EUR 1,000 per MW per month, and time under a court-ordered suspension does not count (Law 4951/2022, art. 19).

Does the calculator store my dates?

No. It runs in your browser; the calendar file is generated on your device and nothing is sent anywhere.

The calculator is indicative and does not replace legal advice on a specific project. The decision or licence itself, any extension or suspension recorded on it and later amendments to the law prevail over the dates shown.

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