Distributed Generation (DG) is commonly defined as electric power generation facilities that are not directly connected to a bulk power transmission system [1]. They cover a multitude of energy sources, fuels, and conversion methods to produce electricity through photovoltaic (PV) arrays, wind turbines, fuel cells, microturbines, liquid and gas-fueled reciprocating engines, etc. Given the wide variety of sources, it is natural that specific impacts associated with DG would vary with type and application. However, there are many common threads on how DG benefits the customers they serve and society at large. This is demonstrated in this paper through several examples, giving testimonials of the positive impact these installations have.

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"A Multifaceted View of Distributed Generation Systems and Their Impacts"

by Marcelo Algrain, Ph.D.

Engineering Technical Steward, Electric Power Division, Caterpillar Inc.

1. Emergency/Temporary Power Application:
In mid-November 2007, the town of Chester, California, was preparing to undergo a 72-hour power shutdown.

2. Open-Market Price Hedging:
The volatility in the energy market was greatly affecting the power department budget in the city of Hurricane, Utah.

3. Combined CHP and Standby Power for Hospital:
A cost effective combined heat and power (CHP) and standby power generation package was required for the Norfolk and Norwich Hospital being built by Octagon Healthcare in the United Kingdom.

4. Landfill Applications:
Landfill-gas-to-energy embodies the ideal solution to an environmental problem: it turns nuisance waste into a product with a practical use and economic value.

5. Biogas Applications:
Biogas is produced through the natural anaerobic decomposition or fermentation of organic waste, such as manure, municipal solid waste, biodegradable waste or any other biodegradable feedstock within an anaerobic environment.

6. Coal Mine Methane (CMM) Gas Applications:
The anthropogenic release of methane (CH4) into the environment and its global warming potential continues to draw
attention globally.

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