Subdivisions, substations installations, and network alterations are all important aspects of the electricity distribution system. Here are some general points about each of these:

1. Subdivisions: A subdivision is an area of land that is divided into smaller lots for development. In the context of electricity distribution, a subdivision may refer to the process of dividing a larger electricity network into smaller parts to improve efficiency and reliability or to meet the needs of a growing population.
2. Substation Installations: A substation is a facility that transforms voltage levels, controls power flow, and provides system protection to ensure the safe and reliable distribution of electricity. Substations are critical components of the electricity distribution system, and their installation involves the design, construction, and commissioning of new substations or the upgrade and expansion of existing ones.
3. Network Alterations: Network alterations refer to changes or modifications made to the electricity distribution network, such as adding or removing equipment, reconfiguring lines or cables, or changing voltage levels. These alterations may be necessary to accommodate new customers, meet increasing demand, improve efficiency or reliability, or integrate new renewable energy sources into the network.

In summary, subdivisions, substation installations, and network alterations are all important aspects of the electricity distribution system that help ensure the safe and reliable delivery of electricity to customers.