SAN JUAN CAPISTRANO, Calif.--(BUSINESS WIRE)--The Rice Alliance for Technology and Entrepreneurship (Rice Alliance) announced the 10 Most Promising Energy & Clean Technology Venture Companies at the 13th Annual Energy & Clean Technology Venture Forum in Houston last week. Energy & Clean Technology companies showcased their new offerings at the largest venture capital conference in the Southwest with 500 attendees, including investors, venture capitalists, industry representatives, b