How Randwick Council achieved >40% energy savings at Lionel Bowen Library - 100% Renewables

How Randwick Council achieved >40% energy savings at Lionel Bowen Library

100% Renewables has helped many organisations to set ambitious renewable energy and carbon reduction goals and developed the strategies and action plans that will help them get there. While this is one key metric for our business, a greater measure of success is when we see clients implement projects that will take them towards their targets. In this blog post, we showcase measures implemented by Randwick City Council to significantly reduce the energy demand and carbon footprint of the Lionel Bowen Library in Maroubra, Sydney.

Randwick City Council’s climate change targets and plan

Randwick City Council has set a number of ambitious environmental sustainability targets for its operations, including targets for reduced greenhouse gas emissions. In March 2018, Council adopted the following targets:

  • Greenhouse gas emissions from Council’s operations – net zero greenhouse gas emissions by 2030, including but not limited to the following measures:
    • Council’s total energy consumption – 100% replacement by renewable sources (generated on site or off-site for Council’s purposes) by 2030.
    • Council’s vehicle fleet – net zero greenhouse gas emissions by 2030.

Energy eficiency is a key strategy for achieving these goals, as set out in the 100% Renewable Energy Roadmap completed in early 2020.

Lionel Bowen Library energy use and solar

The Lionel Bowen Library is one of Council’s largest energy-using facilties, consuming 7.8% of Council’s total electricity demand in 2017/18. This was after the implementation of a 30 kW solar panel array on the roof of the library in 2013, as well as efficiency measures including VSD control of the cooling tower fan and voltage optimisation of the main incoming supply. The solar array generates 40,000 kWh of renewable energy each year, which is fully consumed within the library.

Lionel Bowen Library solar installation, Randwick City Council (photo by Patrick Denvir)
Lionel Bowen Library solar installation, Randwick City Council (photo by Patrick Denvir)

New energy efficiency projects at Lionel Bowen Library

Concurrent with the development of Council’s 100% Renewable Energy Roadmap, Randwick initiated a project to roll out LED lighting at selected sites, including the library. A multi-faceted process included the

  • development of the business case to secure internal support and approval,
  • selection of a preferred supplier,
  • implementation of a trial ‘LED space’ and measurement of light and energy savings as well as visitor perceptions of the upgraded space,
  • influencing key internal stakeholders to support the whole-facility rollout,
  • implementation including claiming the Energy Saving Certificates (ESCs) for the project, and
  • measurement of the energy savings.

During the development of the 100% Renewable Energy Roadmap it was observed that after-hours control of several of the library’s air conditioning systems was not working effectively. In addition, a storeroom fan system in the basement of the building was observed to be running continuously.

Consultation with facilities management staff indicated that faulty BMS controllers meant that time schedules as well as after-hours controls were not correct, and quotes would be sought for new timers to rectify this. Quotes for a new timer for the storeroom fan system were also sought.

In late 2019, the new time control measures were implemented, with significant immediate energy savings identified in load data for the library. The combined impact of the LED lighting and air conditioning system control changes has been to reduce the library’s electricity consumption by nearly 40% when comparing similar periods of 2017/18 with energy consumption in early 2020. This saving is illustrated below in two charts.

  • The first chart shows monthly electricity consumption from June 2018 through to February 2020, with the steep downward trend in monthly electricity use evident.
Monthly electricity consumption - June 2018 to February 2020, Bowen Library
Monthly electricity consumption – June 2018 to February 2020, Lionel Bowen Library
  • The second chart shows daily load profile data and clearly illustrates the impact of the air conditioning timer upgrade on night energy demand between November and December 2019.
Load profile - Nov vs Dec 2019, Bowen Library
Load profile – Nov vs Dec 2019, Lionel Bowen Library

Future savings initiatives at Lionel Bowen Library

There are plans to implement additional measures at the library that will see even more energy savings achieved and more renewable energy. These new measures are set out in Council’s 100% Renewable Energy roadmap and include:

  • Installation of a further 30-45 kW of solar PV on the roof of the library which will be absorbed on site.
  • Progressively upgrade the main and split air conditioning systems in the library (which have reached the end of their economic life) with energy efficient systems. This will have the added benefit of removing R22 refrigerant from the library and seeing a switch to a lower-GWP refrigerant. Opportunities to implement VSD control of fans and pumps, and to optimise supply to unused or infrequently used spaces will also be assessed.
  • Implement new BMS controls for new air conditioning plant as this is upgraded.

The combined impact of these changes over time could be a reduction in grid electricity supply to Lionel Bowen Library of 60% compared with 2017/18 electricity consumption.

Progressing towards its emissions reduction target

The energy saving measures implemented at Lionel Bowen Library are just a few among nearly a hundred actions that, when implemented over the next several years will see Randwick City Council realise its goal to reach net zero greenhouse gas emissions by 2030.

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Randwick City Council is one among many leading councils showing that achieving ambitious renewable energy and carbon reduction goals is both feasible and cost effective. 100% Renewables is proud to have played a role in helping this leader through the development of their 100% Renewable Energy Roadmap. We look forward to council’s continued success in reaching their renewable energy targets in coming years.


100% Renewables are experts in helping organisations develop their climate change strategies and action plans, and supporting the implementation and achievement of ambitious targets. If you need help to develop your Climate Change Strategy, please contact  Barbara or Patrick.

Feel free to use an excerpt of this blog on your own site, newsletter, blog, etc. Just send us a copy or link and include the following text at the end of the excerpt: “This content is reprinted from 100% Renewables Pty Ltd’s blog.

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