Residents and businesses in the 13-state region covered by PJM Interconnect have now installed more than a gigawatt of solar power, enough to power between 800,000 and 1 million homes, and more than doubled solar capacity last year, the grid operator said.

The milestone, announced in mid-May, continues the trend of solar growth in the northeastern and mid-Atlantic territory in the last two years, and reflects a range of incentives offered by states that are striving to reach renewable-energy goals. Keep reading →