And there’s another reason to build green.

Hospitals — bristling with high-tech medical equipment and open around the clock, every day of the year — are huge consumers of electricity. Across all its facilities, St. Joe’s uses approximately 22 million kilowatt-hours of electricity a year, said Kevin Flegal, director of facilities services at St. Joseph’s .

The hospital estimates the green features of Phases 2A and 2B — such as high-efficiency windows, advanced heating and cooling systems, daylighting and potential for a solar power array — will save more than 3 million kilowatt-hours of electricity per year and reduce CO2 emissions by 2,187 metric tons per year.