Engineering Recommendation G99
Contents |
[edit] Introduction
Engineering Recommendation G99, or EREC G99, was issued by the Energy Networks Association (ENA) in July 2018 and came into effect on 27 April 2019. It applies to organisations involved in developing generation projects that are connected to the grid. It also affects how different types or configurations of equipment must comply with the requirements.
EREC G99 was published by the ENA to replace EREC G59. After 27 April 2019, organisations were longer legally permitted to connect certain types of power generation equipment that was solely compliant with G59.
[edit] Changes brought about by EREC 99
EREC 99 established more stringent operating parameters for all new generation equipment 1MW (or larger) that would be connected to public distribution networks of licensed Distribution Network Operators (DNOs). It also changed the application process for this type of equipment and put new compliance and commissioning requirements in place.
Under EREC G99, this type of equipment must provide frequency response in either Limited Frequency Sensitive Mode (LFSM) or Frequency Sensitive Mode (FSM) to control active power output in response to frequency changes on the grid.
Generators over 1MW must also include:
- Fault ride through to keep them connected when there are significant voltage depressions due to faults on the grid.
- Fast fault current injection to support the system during a fault by quickly injecting reactive current in order to keep the grid voltage from dropping too low.
- Voltage control systems that can inject or absorb reactive power into the grid to control voltage.
- Enhanced variable reactive power capabilities.
- Testing and protection capabilities previously handled by large grid code compliant power stations.
[edit] Related articles on Designing Buildings
- Microgeneration for buildings
- Power generation
- Power supply.
- Smoothing the path to net zero.
- The future of UK power generation.
[edit] External resources
Featured articles and news
Retrofit 25 – What's Stopping Us?
Exhibition Opens at The Building Centre.
Types of work to existing buildings
A simple circular economy wiki breakdown with further links.
A threat to the creativity that makes London special.
How can digital twins boost profitability within construction?
The smart construction dashboard, as-built data and site changes forming an accurate digital twin.
Unlocking surplus public defence land and more to speed up the delivery of housing.
The Planning and Infrastructure Bill
An outline of the bill with a mix of reactions on potential impacts from IHBC, CIEEM, CIC, ACE and EIC.
Farnborough College Unveils its Half-house for Sustainable Construction Training.
Spring Statement 2025 with reactions from industry
Confirming previously announced funding, and welfare changes amid adjusted growth forecast.
Scottish Government responds to Grenfell report
As fund for unsafe cladding assessments is launched.
CLC and BSR process map for HRB approvals
One of the initial outputs of their weekly BSR meetings.
Architects Academy at an insulation manufacturing facility
Programme of technical engagement for aspiring designers.
Building Safety Levy technical consultation response
Details of the planned levy now due in 2026.
Great British Energy install solar on school and NHS sites
200 schools and 200 NHS sites to get solar systems, as first project of the newly formed government initiative.
600 million for 60,000 more skilled construction workers
Announced by Treasury ahead of the Spring Statement.
The restoration of the novelist’s birthplace in Eastwood.
Life Critical Fire Safety External Wall System LCFS EWS
Breaking down what is meant by this now often used term.
PAC report on the Remediation of Dangerous Cladding
Recommendations on workforce, transparency, support, insurance, funding, fraud and mismanagement.
New towns, expanded settlements and housing delivery
Modular inquiry asks if new towns and expanded settlements are an effective means of delivering housing.