Ireland's maritime regulator has refused consent for a proposed 300MW floating solar development in the Shannon Estuary, citing concerns over the applicant's technical and financial capability and the project's alignment with Government marine spatial planning policy.
The Maritime Area Regulatory Authority (MARA) has refused a Maritime Area Consent (MAC) application for a proposed 300MW floating solar development in the Shannon Estuary, between counties Clare and Limerick.
The decision, dated Tuesday, 13 October 2026, concerns an application by Net Zero Energy Project 4 Limited for floating solar photovoltaic units and associated marine infrastructure.
The MARA application record identifies the proposal under reference MAC20230032, following an application submitted on 12 July 2024.
The proposed development included floating solar generating units, mooring systems and associated electrical cabling.
Technical and Financial Capability
In its final determination report, MARA identified three grounds for refusing the application.
The first concerned the applicant's technical capability and experience in delivering projects comparable to the proposed development.
MARA found that the applicant had not demonstrated the required prior corporate project experience, stating that the reference projects submitted were not comparable in scale or nature to the proposed 300MW floating offshore solar development.
The regulator also concluded that the applicant had not satisfied the statutory requirements concerning financial commitments or obligations associated with the proposed maritime usage.
Net Zero Energy Project 4 Limited disputed these findings in additional submissions, arguing that it had demonstrated the necessary technical competencies for a project involving an emerging renewable energy technology.
The applicant also questioned the timing of the financial assessment while MARA's Maritime Area Consent levy arrangements were under review.
MARA maintained its assessment, finding that the ongoing levy review did not prevent it from determining the application.
Government's Plan-Led Approach
The third ground for refusal concerned the proposal's compatibility with Government policy for offshore renewable energy development.
MARA found that the proposed floating solar project did not align with the Government's plan-led approach to developing offshore renewable energy in Irish waters.
The applicant argued that floating solar was an emerging technology and that the application should be considered in the context of continuing developments in marine planning policy.
It sought either a grant of consent or a deferral of the decision pending further policy and regulatory developments.
MARA declined to defer its determination and assessed the proposal against the policies applicable at the time.
The regulator acknowledged the potential contribution of the development to renewable electricity generation but concluded that the application did not satisfy the requirements for granting Maritime Area Consent.
Floating Solar in Irish Waters
The Shannon Estuary proposal is substantially larger than earlier floating solar developments considered for Irish coastal waters.
In 2021, Afloat reported on a proposed 1.5MW floating solar installation at Ringaskiddy in Cork Harbour, involving Mayo-based SolarMarine Energy.
That project highlighted regulatory challenges facing floating solar technology under the marine licensing arrangements then in place.
The Shannon Estuary proposal is a separate development involving a different applicant.
MARA issued a preliminary notice indicating its intention to refuse the Shannon Estuary application on 7 August 2026.
The applicant submitted further material on 28 August, which was considered before MARA issued its final determination on 13 October.
The formal refusal notice confirms that Maritime Area Consent was not granted.
The decision concerns the applicant's request for consent to occupy and use the maritime area. It is not a refusal of planning permission or a general prohibition on floating solar development in Irish waters.

















































