Answer:

There are 3 main reasons:

1. There is no other source of electricity available.
2. There is insufficient capacity from the commercial supplier to meet requirements.
3. An alternate source of electrical power is necessary in the event of a periodic or sustained loss of commercial mains power. Such power losses can seriously affect different organisations:

• In Hospitals – a loss of patient monitoring and/or life support.
• In Data Centres – a loss in data processing and some data.
• In offices and accommodation buildings – a loss in power, lighting and lifts.
• In Processing Plants – loss of production, raw material and/or product.

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