To date, 29 states have legally binding renewable portfolio standards (RPSs) or policies that require electricity suppliers to source a certain portion of their electricity from renewable resources or related eligible technologies. Eight more states have non-binding renewable portfolio goals.

States with legally binding RPSs collectively account for almost two-thirds (63 percent) of electricity retail sales in the United States.

According to a recent news release from the U.S. Energy Information Administration, four of the 29 states with legally binding RPSs have recently updated their requirements.

New Mexico has increased its RPS requirements from 20 percent by 2020 to 100 percent by 2045. Washington state has increased its requirements from 15 percent by 2024 to 100 percent by 2050. Nevada has increased its requirements from 23.5 percent by 2025 to 100 percent by 2050. And Maryland has increased its requirements from 22.5 percent by 2025 to 50 percent by 2030.

Earlier in the year, the District of Columbia increased its RPS requirements from 50 percent by 2032 to 100 percent by 2032, and California increased its requirements from 50 percent by 2030 to 100 percent by 2045.

As a result, six states now have 100 percent RPSs—Hawaii (which set its 100 percent goal in 2015), California, the District of Columbia, New Mexico, Washington and Nevada.

If this trend continues, there may come a time when every state in the nation has a 100 percent RPS, meaning all power generated in the United States will need to come from renewable sources.