Ultima Grid Solutions

Australian Grid Voltage Survey

The Australian Energy Security Board (ESB) conducted a comprehensive grid voltage survey to analyse voltage levels across the National Electricity Market (NEM). The survey provides insights into the current state of grid voltage management and its implications for energy efficiency, power quality, and regulatory compliance. 

Purpose of the Survey

The ESB conducted the grid voltage survey to assess the voltage levels across the NEM and understand their impact on energy consumption, equipment performance, and compliance with Australian standards.

 The survey aims to provide data-driven insights to guide policymakers, regulators, and industry stakeholders in improving voltage management practices and optimising grid performance.

A summary of the Survey may be downloaded here.

Key Findings

Voltage Levels Exceeding Standard Limits

The survey found that voltage levels at various points in the grid often exceed the recommended limits set by the Australian Standard AS 61000.3.100, which specifies a nominal voltage of 230V with an allowable range of +10% to -6% (216V to 253V).

Many regions recorded voltages consistently above 240V, leading to increased energy consumption and potential stress on electrical equipment.

Regional Variations in Voltage Levels

Voltage levels vary significantly across different regions within the NEM, with some areas consistently maintaining higher voltage levels than others. Urban areas tend to have more stable voltages, while rural and remote regions experience greater variability due to long transmission distances and lower network strength.

Impact on Energy Efficiency

Higher-than-optimal voltage levels can lead to increased energy consumption by resistive loads (e.g., lighting, heating), resulting in higher electricity bills for consumers. Voltage optimisation could potentially reduce energy use by up to 10% in some areas.

Implications for Renewable Integration

The increasing penetration of distributed energy resources (DERs) such as rooftop solar has contributed to voltage fluctuations. Inverters connected to DERs can cause voltage rise in low-load conditions, requiring better management and coordination with grid voltage levels.

Power Quality and Equipment Longevity

High voltage levels can lead to equipment degradation, reducing the lifespan of appliances and machinery. The survey highlights the importance of maintaining voltage within standard limits to ensure optimal equipment performance and minimise wear and tear.