[SMM PV Flash] Finland Introduces Grid-Forming Requirements for Solar in Weak Grids

Published: Oct 16, 2026 10:13 (GMT+8)

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Finnish transmission system operator Fingrid has introduced new technical requirements requiring certain new large-scale wind and solar projects connected to weak-grid areas to provide grid-forming support. The rules apply to Type D plants where the equivalent short-circuit ratio at the connection point is below 1.0, while operating projects and those with existing connection agreements are exempt. Developers can meet the requirement through battery storage, energy-storage-equipped STATCOMs or synchronous machines, with higher support levels required as grid strength declines. The rules indicate that grid requirements for inverter-based renewables are expanding beyond conventional connection and fault ride-through capability toward active voltage and system stability support.

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