Police are investigating the thefts of power tools from the Glenrowan Solar Farm last Wednesday night, adding to a string of burglaries at the facility in recent months.

Detective Senior Constable James Howarth of Wangaratta Criminal Investigation Unit said police believe three accused burglars gained access to the solar farm and took a number of tools.

The three accused are also alleged to have stolen power tools from a Yarrawonga council depot the same night.

It was the fourth time in recent months the solar farm situated near the Hume Freeway had been subject to a burglary.

The theft of an $80,000 Bobcat on 27 June was one of the previous burglaries.

Det Sen Const Howarth said all three past burglaries had been resolved, with offenders apprehended and items retrieved.

He said it was most likely new offenders on this occasion and Wangaratta detectives continued to investigate.

Anyone with information regarding the thefts is urged to call Crime Stoppers on 1800 333 000 or Wangaratta Police on (03) 5723 0888.