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Distributed Generation Resources

 

The following information outlines some of the typical Distributed Generation (DG) systems currently available:

Solar Photovoltaic

Photovoltaic (PV) cells collect the sun’s energy and convert it directly into electricity, using solar cells comprised of semiconductor material. PV systems have numerous advantages:

  • No moving parts
  • Operates silently
  • Requires little maintenance or regular scheduled maintenance
  • Can be stored in deep-cycle batteries for evening or back-up use

A PV system produces DC power compared to the 120V AC power supplied by utility companies. This requires special equipment to convert DC to AC power called an inverter.

Wind Power

Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity. Due to the lack of wind production in this region of the state, wind power is not recommended for significant energy savings as opposed to other regions of the state. The average annual wind speed at 262 ft. (80 m) above the ground is 12.3 mph (5.5 m/s) for this region.

Landfill Gas

Landfill gas is produced by decomposing garbage, which is collected and either flared off or used to produce electricity. Landfill gas is a mixture of gases including carbon dioxide (CO2) with the largest component being methane gas. This gas can be captured and used to power a turbine generator thus producing electricity.

Combined Heat and Power (Cogeneration)

Combined Heat and Power (CHP) devices produce both electrical and thermal energy and use the heat or steam for industrial processes, heating or cooling. It is one of the most common forms of increasing energy efficiencies.

Micro Turbines

Micro Turbines are small combustion turbines that can produce between 25 kW and up to 500 kW of power and consist of a small gas turbine that drives a generator. They may be used to burn a variety of fuels including natural gas, fuel oil and landfill gas in order to produce electricity.

Energy Storage

Energy storage can be achieved by devices or physical media that store a form of energy to be used at a later time. The most common at this time are fuel cells and battery storage.

The Future of Distributed Generation

As DG progresses it may become a tool in addressing environmental challenges in our world. Renewable energy sources like solar and wind (from the west and southern coast of Texas) are part of CPS Energy’s overall strategy to meet Greater San Antonio’s energy needs with diversified sources.