Hayward police discover marijuana factory worth $15 million

HAYWARD, Calif. (KGO) -- Hayward police have discovered a massive 44,000 square foot marijuana factory. Authorities say the value of the 13,000 plants seized is around $15 million.

The electrical systems inside had been dangerously bypassed with many major illegal connections, powering an elaborate hydroponic watering system, lighting system and ventilation system.

Hayward police say the operation included a harvesting and packaging room, living quarters and a sophisticated surveillance system.

It is suspected the marijuana grow operated 24/7 and cost in excess of $100,000 to build, police say.

Authorities arrested three men last week at the scene -- 28-year-old Manh Tran, 21-year-old Troy Tam and 27-year-old Tony Hoang -- and charged them with felony marijuana cultivation and sales.