By 2030, older buildings would have to decrease their greenhouse-gas emissions and new buildings would be required to be emissions-free.

The other provision are okay, but this one is a bit confusin' to me.

First off, 2030 is a bit late in the timeline.  Existing buildings could reduce their energy consumption right away, no need to wait nearly 2 decades to do so.

I also wonder what they mean by "emissions-free".  Obviously, any building that uses energy from an outside grid would produce GHG emissions (unless the state has plans for the entire grid to go 100% renewable by 2030...and I don't think it does).

And I doubt they'd require all buildings to produce their energy on-site (as great as that would be).

So how can new buildings be emission free?

Do they just mean from the construction process alone?  In that case, I assume offsets would most likely be involved?