The Democrat is scheduled to attend a Thursday signing ceremony at Newport Vineyards in Middletown.
The legislation includes a "community solar" program that allows people to join together to finance a solar generator and get credited for the electricity it produces. It's meant for those who want to tap into solar power but don't have a roof to install panels or can't afford to spend up to $20,000 on them.
It's also attracted the attention of California-based Solar City, which is sending a representative to Raimondo's event.
More than a quarter of states already allow such third-party financing, including Massachusetts and Connecticut.