Peak Shaving Case Study
Gas Station, California, US
The grid purchasing costs for a gas station in California, US comprises of energy charging and demand charging. The energy rate varies with time of usage viz., on-peak and off-peak, which is a set fee paid monthly or seasonally. Most customers pay for the energy they use (measured in kWh). Larger users of electricity like our client are charged for demand (measured as kW). This demand charge is a large part of their bill especially when they use a lot of power over a short period of time.
In this peak shaving case study, solar energy is a viable way to help solve the problem of power demand, and the way to use solar power system at highest efficiency is connecting it to Battery Energy Storage System. Though peak demand is unpredictable, the power generated by solar panel could be optimally used to respond to the peak demand conditions.
Cost Saving Benefits
The system cost is US$288,600. The local electricity rate is US$0.16/kWh. Assuming 8 hours of sunshine per day, the annual consumption savings will be US$35,974. With a demand reduction of US$3,000, the total saving will be US$38,974 per year.
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*SGIP in California offers 85% rebates for BESS under equity category.
About The System
The system comprises of a 300 kWh/100kW BESS connected with a 77kW solar power system. This setup will be able to support demands of the local building during peak hours through BESS or solar PV system, while the BESS will charge during off-peak hours through solar PV or the grid.