This sub-class includes engineering design and/or consultancy services in energy management and/or clean energy systems such as: •hydropower •solar photovoltaics •wind energy •systems that generate electrical power using fossil fuels Units in this sub-class are primarily engaged in: •energy management and/or clean energy systems engineering design (i.e., applying physical laws and/or principles of engineering in the engineering project). Other services related to the engineering project may be provided as well, for example: provision of advice, preparation of feasibility studies, preparation of preliminary and/or final plans and designs, provision of technical services during the construction or installation phase, inspection and/or evaluation of the project. •energy management and/or clean energy systems engineering technical consultancy services (i.e., provision of advice to clients regarding engineering principles and/or methods) •energy management and/or clean energy systems engineering project development and/or management, which may include procurement, construction and installation services