Xcel: Welcome to our 11th annual Day of Service in Colorado. Day of Service began in 2010 to honor the anniversary of September 11 and has grown to be Xcel Energy’s largest single-day company volunteer effort. Day of Service is September 9-11 and we are offering a mix of in-person and remote volunteer projects. Volunteer projects during the work week are eligible for VPTO. Xcel Energy employees, family and friends are invited to participate, so choose a project or projects (yes, you can sign up for in-person and take home projects) that work with your schedule and comfort level!