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SOLAR PLUS BATTERY - A COMMUNITY FIRST

  • For the nerds and techies
  • Number and type of panels: about 2300 (620 W each)
  • Orientation of panels: fixed north facing
  • Total DC capacity of farm: 1.4 Mw
  • AC output of farm: 1.3 Mw
  • Area of land: approximately 2.2 hectares
  • Total annual output: 2,400 MWh

 Not only will the solar farm pump renewable energy into the grid, but installing a battery will allow the project to sell into the grid at the most financially advantageous time of the day (usually the late afternoon/evening), and this will ensure that the revenue and ROI is maintained at the projected levels.

  • Storage capacity of battery:  4.07 MW
  • Line voltage at connection: 33 KV
  • Connection Point: North west corner of property
  • Fimer PVS 980-58, 1818 KVA,  skid mounted pre-wired inverter / transformer
  • Ring Main Unit: ABB 33 kV 50 Hz V REJxxx
  • DC DC Converter: DynaPower DPS-500 DC-DC 500kW Converter

Sale of Electricity

There are several ways output from the farm can be sold, all through the grid:

In this method, energy is sold to one or more “loads” (normally large institutions, businesses, government agencies) at a fixed price over a fixed term. The institution may take all or part of the total output of the farm.

  • Pros: Certainty of revenue stream over fixed period (up to 5-10 years); if not fully subscribed, some output can still be sold through options 2 and 3
  • Cons: Price is normally lower than what can be achieved through other methods

The output of the farm is bought by a retailer and then on-sold to its customers as “Green Power”. Customers could be limited to people in the region (including Co-op members) as a first option and then others if not fully subscribed.

  • Pros: Certainty of revenue stream over fixed period (up to a year); members can purchase farm output from the retailer;
  • Cons: Price is normally lower than what can be achieved through other methods; customers might have to change retailers to the participating retailer.

Output is sold on the spot wholesale market through a broker.

  • Pros: On average, a considerably higher revenue stream than the first two options; less negotiation required, so easier to implement quickly; battery allows sale of energy at peak price points in the late afternoon / evening; PPA and Retail can be considered at a later date if appropriate and financially advantageous.
  • Cons: The wholesale price changes every five minutes, so revenue projections are more difficult; members do not have opportunity to purchase energy from the farm; 

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