If 2023 has taught us anything, it is that the energy landscape is dynamic, robust, and versatile. South Africa and the world are at a historic juncture, with business and consumers alike implementing alternative energy technologies to meet their daily demands. One option that is gaining traction is the microgrid, offering a wide range of capabilities that benefit specific energy goals and business strategies.
Microgrids have the potential to meet the needs of various industries and sectors. They allow businesses to generate electricity onsite, use it when needed, and potentially sell excess power back to a relevant utility. Importantly, microgrids allow businesses to address a major concern, the variability and unpredictable nature of energy costs. Onsite renewable energy resources such as wind farms, solar panel arrays and battery storage systems take these variable costs out of the equation.
A microgrid could be a cost-effective alternative or addition to a business’ energy mix if current power purchase agreements (PPAs) cannot guarantee a competitive rate per kWh. Enterprises that establish their own onsite energy resources can become more self-reliant and less vulnerable to the unpredictable forces affecting energy costs.
Controlling demand and costs
As a practical example, local power suppliers categorise commercial buildings based on peak demand. If a business is identified as a tier-2 customer with a potential 10 kW peak demand, the utility must be prepared to supply that amount. This entails expanding the grid, adding substations, and laying more cables, all of which come at a cost. Unfortunately, businesses are often placed in a tariff bracket with a higher allocated peak demand irrespective of their actual loads, leading to higher monthly energy bills. This base cost for the allocated peak demand is in most cases more than the effective power consumed on their energy bill.
Here microgrids can play an important role. When implementing a microgrid, service providers work closely with customers to identify essential and non-critical loads. Microgrids allow businesses to implement a strategic load management plan, which in turn reduces the peak demand.
For example, if your peak demand is six kilowatts due to simultaneous activation of multiple loads, the microgrid controller system can deliver a staged activation process. This means businesses can strategically schedule the activation and deactivation of loads, lowering overall energy costs. Peak demand is a key component of an organisation’s allocated tariff, and by managing it effectively, businesses can position themselves in a lower cost bracket.
Microgrids at work
As an example, Bimbo Bakeries USA, a national food producer, plans to switch on microgrids built and operated by Schneider Electric at six bakeries in California. The project is part of Bimbo’s strategy to cut its carbon emissions in half by 2030 and achieve net-zero carbon emissions by 2050. The goal is that microgrids will supply 25% of its energy needs, and reduce carbon emissions by 25% at each site. In addition, it will allow Bimbo to convert natural gas ovens to electricity, a major step in decarbonisation.
A major consideration is to lessen the strain on local utilities which are finding it harder to meet electricity demand. By integrating the microgrids, which include solar arrays and energy storage, Bimbo will generate additional power load and create a more sustainable energy mix than the local utilities can provide. “Utility rates in California keep rising, and there are many incentive programmes to help get projects like this off the ground. Microgrids can be profitable, and also improve the communities where we live and work,” says Bimbo.
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