Any structure or building or assembly of component
parts, whether housed or not, which is intended to generate electrical
energy or to convert or transform electrical energy or to change the
type of frequency or voltage; except, however, that the Board of Trustees
may, in specific cases, grant a permit for the construction of such
a structure, building or component parts when and if such Board shall
find as a fact, after public notice and hearing, that such a structure,
building or component parts is necessary and desirable to improve
and increase the efficiency of any electric light and power transportation
or like facilities and services rendered to the inhabitants of the
Village of Rockville Centre, and that in the proposed location, size
and character of construction thereof and its general nature and operation
will not be detrimental to the general health and welfare of the community.