The Australian Energy Market Operator is curtailing generation from the 200-megawatt Silverton Wind Farm near Broken Hill, which is owned by QIC and the Future Fund and supplies AGL Energy, to between a quarter and three-eighths of capacity as part of its effort to protect the grid, which is  struggling to accommodate a runaway boom in wind and solar energy.

AEMO is also requiring more new wind and solar projects to install costly equipment to protect the grid's "system strength" while longer-term solutions – such as new high-voltage interstate  inter-connectors which can cost more than $1 billion – are run through a rigorous regulatory investment approvals process.