42 Providing design of energy systems and equipment in the fields of solar energy, wind energy, energy storage, hydroelectric energy, thermal energy and natural gas energy; engineering services in the field of energy systems, namely, solar, wind, hydroelectric, thermal, and natural gas; installation, operation, and maintenance of energy systems in the fields of solar energy, wind energy, energy storage, hydroelectric energy, thermal energy and natural gas energy; platform as a service (PAAS) featuring computer software platforms for use in the field of energy management