MORE than a billion dollars of solar energy investment in the Gannawarra hangs in the balance as the local council hits a major hurdle in securing a high-voltage transmission line through Kerang.

Gannawarra council has revealed six of its eight solar farm projects worth $1.3 billion have been put on hold as developers wait to see which of three options the Australian Energy Market Operator (AEMO) will endorse for an upgrade to the power grid in the region.