At Helec Limited we have a proud history of delivering a first class service to deliver, commission and maintain Energimizer CHP units ranging from 7.5kWe, 16, 22, 33, 50 & 75kWe units. As Helec turns 10 years old, and we look forward to continuing to provide CHP energy solutions and CHP units; while being at the forefront of all the latest technological CHP system innovations.

According to the ENA’s G99 document G99 type tested equipment is defined as:

“A product which has been tested to ensure that the design meets the relevant requirements of G99 and that all similar products supplied will be constructed to the same standard and will have the same performance.”

To this end, Helec are pleased to announce that all of our “Energimizer” Combined Heat and Power models type tested for the new 2019 G99 applications, fulfilling the Criteria set out by the Regional District Network Operators (DNOs). Furthermore, all of our Energimizer CHP units now provide low NOx exhaust emissions to comply with the Government’s Clean Air Act, whilst delivering power through the quietest most compact in its class.

What’s happening with G98 G99 and what will this change in the CHP Industry?

ENA G98 and ENA G99 are the two new standards coming into force affecting generating plants that will be connected to the UK distribution network from Q2 2019. G98 will replace the G83 and the G99 will replace the G59 standard.


What Impact will G98 G99 have?

These new standards will radically affect the connection and agreement process for all new solar PV, wind, battery storage, CHP and thermal generation plants that are planned for connection to the grid. The standard also addresses the integration of battery storage technology.

As with the previous standards, G99 is applicable to generators with a rating above 16A/ phase, and G98 applies to generators with a rating below 16A/phase.


What CHP System Standards will Helec be using?

  • Due to the nature of our core business, Helec will focus on the G99 system standard, as this is the more complex standard, and will affect the majority of Helec’s Clients going forward.
  • As with the G59 standards, the G99 is applicable to generators with a rating above 16A/phase, while the G98 applies to generators with a rating below 16A/phase. As Helec typically deals with generators above the 16A/phase, the G98 will not usually be applicable for us as a business.

What was the reason for the change from G59 to G99?

We imagine your first thoughts are why all the change? The simple answer is as follows:

The amount of embedded generation connected at 11kV, 33kV and 132kV has far exceeded industry expectations, and many of the larger traditional thermal generation plants are mothballed or nearing the end of their life.

This has shifted how electricity is generated and distributed and pushed the DNOs like UKPN, WPD, SSE, NPG, SPEN and ENWL into a role where they need to actively manage their network in a way they haven’t needed to before.

From a nationwide point of view to have an effective power generation network, it must be controlled actively with local generation matched closely to local demand to keep the electricity supply stable and within the necessary performance criteria.

The new rules have therefore been implemented to enforce new performance specifications on smaller scale generators connecting at these lower voltages. The biggest changes affect projects that are greater than 10MW or are connected at 132kV – although in practice connecting a project <10MW at 132kV would be very unusual.

The New G99 Acronyms and Definitions:

The G99 process brings into force new acronyms and new definitions such as;

  • Power Generating Facility – A plant building that is connected to the DNO network and contains one or more power generating modules.
  • Power Generating Module – A generating unit inside the Power Generating Facility. This can be either a Synchronous Power Generating Module or a Power Park Module.
  • Synchronous Power Generating Module – a generating unit inside the Power Generating Facility that (i.e. usually diesel engine, gas engine, gas turbine or steam turbine).
  • Power Park Module – A generating unit (or battery storage unit) that asynchronously generates power or is connected via power electronics (I.e. Type 4 wind turbines, battery storage units and solar PV inverters).
  • Generating Unit – Any unit that produces electricity.

For more information on these new applications and the additional support, we can look to offer you and your client then Get In Touch by phone or email us on