What is an embedded generator?

An embedded generator (EG) of electricity refers to a generator connected to the distribution network, typically located at a residential, commercial, or industrial site behind the customer’s meter. Types of EG include solar photovoltaic (PV) technologies (solar panels), wind turbines, biogas, diesel generators, etc. This platform only accepts solar PV generation presently – with or without battery storage (the intention is to update it to include all forms of generation in the future).

Off grid systems and standby generators are not ‘embedded’ generators, as they do not generate electricity onto the network (even via the customer’s wiring) at the same time as the facility is powered by the distributor’s network.

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Small-scale embedded generation

Small-scale embedded generation (SSEG) is a generator up to 1000kVA (or 1MVA). Most electricity generated by an SSEG system is typically consumed on-site. However, when electricity generation exceeds on-site consumption, some electricity may be allowed to flow, in reverse, from the consumer to a municipality’s distribution grid. Businesses and households are likely to install solar PV SSEG systems to reduce their electricity costs or lower greenhouse gas emissions. Such systems can also reduce the negative effects of load shedding if installed with batteries.

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Legal requirements

Municipal customers that wish to install an SSEG are required to adhere to various standards and regulations, and are legally obliged to have formal permission from the distributor to connect such systems. Installers should be familiar with these conditions. Failure to obtain permission can result in disconnection and fines. Note that an SSEG system connected into the wiring of the customer’s premises which is also powered from the distributor’s electricity supply is still an embedded generator and the above compliance requirements apply. More details can be found in the relevant Requirements for Embedded Generation document of each municipality.

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Municipalities that use this platform

The number of municipalities in South Africa that allow SSEG systems onto their electricity distribution networks has increased rapidly from about 15 municipalities in 2016 to 70 municipalities in 2021. This number continues to increase.

The use of this platform by municipalities is entirely voluntary, and if a municipality is not listed on this site please approach them directly for embedded generation application enquiries and submission details.

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More information

The SSEG website www.sseg.org.za contains a wealth of information relevant to municipal embedded generation.