A growing number of organizations as well as the U.S. government are moving beyond commitments to purchase 100% clean energy to power their operations. They’re aiming for carbon-free power 24-hours-a-day, seven-days-a-week. Seattle startup LevelTen Energy, Microsoft, Google, and two clean energy companies announced on Thursday that they’re partnering to create a marketplace to help groups with climate pledges reach that ambitious goal. Most corporate-backed clean energy efforts so far have focused on ramping up installations of solar and wind power facilities. But those power sources aren’t always available.