Ireland TAMS 3 Solar Capital Investment Scheme Guide

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Key Takeaways

• The TAMS 3 Solar Capital Investment Scheme (SCIS) provides a 60% grant rate ring-fenced with its own investment ceiling of €90,000.
• Grant calculations rely on standardised reference costs: the formula y = 1441x + 1849 for solar PV and y = 703x + 753 for battery storage.
• The maximum solar PV system size covered under the scheme is 62 kWp.
• Battery storage is capped at a maximum of 50% of the PV system rating, with a general sizing recommendation of 0.5 kWh per 1 kWp of panels.
• If a farmer installs generation beyond the annual consumption limit, additional capacity must operate as a standalone system.

Scheme Overview and Financial Structure

The Targeted Agriculture Modernisation Schemes (TAMS 3) provide grants to farmers in Ireland to build and improve a specified range of farm buildings and equipment on their holding. Introduced by the Department of Agriculture, Food and the Marine (DAFM) and jointly funded by the European Union and the national exchequer, the Solar Capital Investment Scheme encourages on-farm renewable generation.

The primary objective of the scheme is to encourage self-consumption of renewable energy on a holding and lower energy costs at farm level. Unlike other TAMS tranches that share a cumulative capital limit, the solar scheme is ring-fenced with its own investment ceiling of €90,000 and is grant-aided at the enhanced rate of 60% for both solar PV panels and battery storage.

Standardised Reference Cost Formulas

Grant assistance under TAMS 3 SCIS is determined by statutory reference costs rather than installer quotation figures:

The grant is based on standardised reference costs rather than actual quotes, ensuring fair and consistent funding allocation. Where contractor quotations exceed the statutory reference cost, grant aid is calculated exclusively against the benchmark figure.

System Sizing Limits and Farm Energy Matching

Under DAFM rules, grant aid is calibrated strictly to on-farm electrical demand to prevent public subsidisation of commercial export projects:

• Annual Consumption Cap: The maximum grant-eligible PV system size is limited to the farm's total annual electricity consumption. For example, a 100-cow dairy farm consuming 25,000 kWh per year can install a 25 kWp PV system (based on 1,000 kWh/kWp/year).
• Maximum Output Limit: Across all farm types, the maximum PV system size covered under SCIS is 62 kWp.
• Standalone Capacity Rule: If a farmer installs a PV system larger than the grant-eligible limit, the additional capacity must be stand-alone (not connected to the TAMS-supported system).

Battery Storage Parameters and Technical Lifespan

Farmers may integrate battery storage to capture surplus daytime solar energy for morning and evening farm operations:

• Sizing Benchmark: The maximum grant-aided battery size is 50% of the PV system size. For a 25 kWp array, the maximum eligible battery size would be 12.5 kW. A general recommendation from Teagasc is to size battery storage at 0.5 kWh per 1 kWp of solar PV panels.
• Operational Performance: Most modern batteries allow up to 90% discharge, offering high usable energy capacity.
• Cycling Durability: Batteries used for solar energy storage typically have a design life of 10,000 cycles, which equates to an approximate 14-year lifespan when cycled twice per day.