ESSEX JUNCTION, Vt. (AP) – One-hundred manufacturing jobs are going to be added over the next three months at the IBM plant.

The full-time positions with benefits are not permanent. They will be for up to three years and will pay a base rate of $9.50 an hour, but shift premiums could lift that rate to as high as $12.55 for those who work the night shift, and $11.40 for those working during the day, spokeswoman Zoe Breiner said.

The work will be done in a clean-room environment, Breiner said. A high school degree or similar work experience is required. Training will be provided.

Those hired will work 12-hour shifts – 7 a.m. to 7 p.m. or 7 p.m. to 7 a.m. – and will generally work a schedule of three days on, four days off, followed by four days on, three days off, Breiner said, though individual schedules might vary.

So far this year, IBM has hired 132 such supplemental workers. The overall plant population will remain at about 6,000 because of attrition, she said.

Since 2001, about 2,500 jobs have been eliminated at the plant that makes microprocessor chips for everything from cell phones to supercomputers.

The IBM plant is Vermont’s largest private employer.