energy & decarbonisation

Energy efficiency and decarbonisation pathways for Australian public hospitals

Hospitals are significant contributors to the carbon footprint of healthcare. Hospitals can be particularly energy-intensive as these facilities operate continuously, have strict space condition requirements and contain unique energy loads. Energy efficiency is a low-cost decarbonisation pathway for hospitals and offers co-benefits such as improved reliability and resilience, however the magnitude of this opportunity can be difficult to quantify.

In this study, the energy efficiency potential of Australian public hospitals in Victoria, Queensland and South Australia is estimated using the NABERS Energy for public hospitals dataset. NABERS is an energy performance indicator that measures operational energy use in hospitals, and other large building types, and encodes information about the energy efficiency potential. In this study, the application of energy efficiency, electrification and grid decarbonisation is modelled from 2024 to 2040. We estimate that by 2040, energy efficiency has the potential to deliver a 15-20% reduction in energy consumption to the existing hospital stock. The combination of efficiency and electrification has the potential to reduce the energy intensity of hospital operations by about 40%. By 2040, emissions are projected to fall by 80% using the combination of decarbonisation strategies. The implementation of decarbonisation strategies is modelled probabilistically and a Monte Carlo approach used to derive uncertainty estimates for these predictions. This analysis assumes that hospital heating and cooling systems have the largest potential for efficiency savings. Quantifying the contribution of these healthcare decarbonisation strategies can assist policymakers in allocating appropriate resources for implementing efficiency and other decarbonisation measures.

This research was published recently in the Journal of Industrial Ecology: https://link.springer.com/article/10.1007/s44498-026-00069-1

 
 

Projected hospital futures under multiple decarbonisation scenarios, with scenarios applied cumulatively. Panels (i) and (ii) show emissions and energy reduction waterfall plots by scenario, (iii) and (iv) emissions and energy projections with confidence bounds (confidence bounds shown in a lighter shade around the mean line), (v) indexed bed-days emissions and energy intensity and (vi) indexed fuel consumption

 
 

Panels (i) and (ii) show 2D histograms of transitions from initial to final ratings, with colour scaled proportionally to the number of hospitals in each bin, as observed in the raw data. Note the transitions from initial to final rating states are shown and not the intermediate states. Panel (i) shows all hospitals while (ii) shows hospitals filtered for ‘best performers’. Proportions of the hospital stock in each NABERS rating band, historically and projected into the future, are shown for the BAU and efficiency scenarios in panels (iii) and (iv) respectively (half star increments not shown).

Still waters run deep

Recently Shrunk set out on a journey to build an open, affordable and flexible method for minimising energy related emissions for industrial, residential and remote applications. Deepwater is a microgrid optimisation service, enabling the ideal design and control of on-site renewable generation, storage and local energy consumers. 

Deepwater allows sites to actively minimise (or avoid entirely) their exposure to energy grid related emissions, reliability and cost structures. Deepwater creates a custom-built predictive control strategy, tuned specifically for local conditions and profiles of operation that are unique to each facility. The control is designed and optimised to achieve desired site-specific objectives such as reductions in emissions, cost or enhancing energy resilience ensuring complete flexibility for clients.

Deepwater is interoperable with existing systems installed at your site, both physical infrastructure and any digital monitoring and control platforms. Deepwater is technologically agnostic and simply drives the most value and best environmental outcome out of the existing infrastructure, without locking you in a walled-garden. Participating in the service only takes a few simple steps.

Deepwater is currently in alpha-testing, and we welcome anyone interested in partnering with us to develop it further or you would like to discuss further please get in touch  or visit www.deepwater.studio.

 
 

A place by the fire

An essay submitted to Gill Owen Essay Prize and also published on Renew Economy in 2018:

A place by the fire: energy efficiency and equitable access to energy services

The call for us to respond quickly to climate change is becoming more urgent. The recently released IPCC report [1] reiterated the urgency by which we should reduce greenhouse gas (GHG) emissions if we are to have a chance at avoiding runaway climate change. In the face of this crisis, we should employ all available methods to reduce emissions. Energy efficiency offers a cheap and effective way to reduce energy consumption and the emissions associated with electricity generation and other energy services. While not a solution in itself, efficiency is a complementary strategy that can be employed in conjunction with other approaches such as renewable energy and decreases in material consumption.

There is evidence to suggest there is a significant reserve of energy efficiency potential within the Australian economy. For example, the City of Sydney is aiming for a 31% energy saving by 2030 whilst saving over $200 million dollars [2]. A 13 to 22 percent reduction in GHG emissions was estimated to have been achieved as a result of a NSW government program to build more efficient residential buildings [3]. The federal government’s Energy Efficiency Opportunities program found large potential for savings among Australia’s largest industrial energy users [4]. A study by McKinsey & Co found large potential for both residential and industrial energy efficiency savings, at a negative abatement cost [5]. Energy efficiency in industry is as important as household efficiency, since industrial efficiency provides a large source of savings and also industrial energy costs are baked-in along supply chains of final products purchased by consumers.

Recently energy politics in Australia has focussed on rising electricity prices, however historically Australia enjoyed reasonably low electricity prices [6]. Low prices can work as a disincentive for energy efficiency as higher prices may encourage consumers to reduce their costs by using energy more frugally. However, higher energy prices can disadvantage low income households disproportionately as energy spending constitutes a larger fraction of their total income. These households cannot easily reduce essential energy services such as lighting, cooking and space heating/cooling in the face of higher prices. Furthermore, if climate change causes more severe and frequent heatwaves, access to air-conditioning may become a public health issue. The dilemma therefore is how to reduce our energy use while simultaneously ensuring equitable access to energy services.

 Low income households are adversely affected by high energy prices and barriers which prevent them from accessing energy efficient technology that would help them avoid extra costs. The minimum energy performance standards scheme has been very successful at driving improvements in appliance efficiency [7]. However, there are a range of reasons why low-income households may not have access or be using the most efficient models. An example of this are tenants who are locked-in to whichever technology is installed in their rental property, e.g. hot water systems. In addition, they may not be able to afford a new efficient appliance and be stuck with old or broken appliances. One solution is to assist low-income households in purchasing new efficient appliances by providing access to credit [8]. We can also mandate the disclosure of rental property energy performance to encourage landlords to make efficiency investments.

If we consider access to energy services a necessity and a basic human right, then we should consider means to ensure equal access. Going further, we might see that once basic energy needs have been satisfied, further energy use is ‘luxury’ or discretionary. Thinking along these lines, others have considered a progressive consumption-based tax on energy, although this may be difficult to implement [9]. Alternatively, lower energy tariffs or rebates could be offered to low-income households (there are examples of this policy in California [10] and also NSW [11]). This ‘duty-of-care’ to provide essential services to the vulnerable, elderly and low-income earners was something Gill Owen advocated for in much of her work [12].

The provision of public transport is an excellent example of a policy that achieves both energy and social equity outcomes. Low income earners are exposed to rising fuel prices which can inhibit their ability to travel to their place of employment, particularly when living in areas without adequate public transport. In general, public transport has a lower energy intensity than private car transport and the emissions perspective improves further when electric trains, trams and buses are powered cleanly using renewable electricity. A shift away from private car transport would also reduce Australia’s reliance on liquid fossil fuel imports, which has the potential for disruption [13]. Public transport use also has positive effects on our urban spaces and communities, which can become more vibrant when more people are out and about using public transport. There may also be public health benefits as people engage in more incidental exercise associated with public transport use.

Part of the recent rise in electricity prices has been attributed to profit-maximising behaviour by the energy retailers and network operators [14]. A similar situation exists in the natural gas market, with households paying high prices as gas extractors prefer to sell to the profitable export market rather than satisfy domestic demand [15]. One solution to this is for communities to take control through community-owned not-for-profit renewable energy projects. There are numerous examples of successful community owned renewable energy generators in Australia [16]. These entities allow communities to reflect values they consider important, for example, ensuring equal access to energy and profits remaining in the community. This also provides communities autonomy over their clean energy future without requiring federal energy policy. Such networks also provide a way for low-income households to participate in renewable energy, as they are likely priced-out of the rooftop solar market. In remote and rural areas, these projects can be paired with new microgrid technology [17].

Providing energy services to everyone in our community, including the most vulnerable, is our societal responsibility. Equally, we must respond quickly and decisively to cut our GHG emissions to avoid dangerous climate change. Fortunately, there are number of strategies we can employ to achieve these dual outcomes. Energy efficiency and equity is an important topic in the context of rising inequality in developed countries, but it also requires us to consider more broader questions such as – who should bear the burden of climate change mitigation? Globally there are approximately 1 billion people who do not have access to electricity and our challenge is to meet their needs while dramatically reducing global emissions.

[1] Intergovernmental Panel on Climate Change, https://www.ipcc.ch/

[2] City of Sydney, 2015, Energy Efficiency Master Plan, https://www.cityofsydney.nsw.gov.au/__data/assets/pdf_file/0020/241436/Energy-Efficiency-Master-Plan-low-res.pdf

[3] Energy Australia, BASIX Monitoring Report: Electricity Consumption for 2007-08 and 2008-09, https://www.basix.nsw.gov.au/iframe/images/energyMonitoringReport2007-2009.pdf

[4] The Energy Efficiency Opportunities (EEO) program: https://www.eex.gov.au/large-energy-users/energy-management/energy-efficiency-opportunities

[5] McKinsey and Co, 2008, An Australian Cost Curve for Greenhouse Gas Reduction, https://www.mckinsey.com/business-functions/sustainability-and-resource-productivity/our-insights/an-australian-cost-curve-for-greenhouse-gas-reduction

[6] https://www.abc.net.au/news/2018-07-18/electricity-price-rises-chart-of-the-day/9985300

[7] Energy Efficient Strategies, Whitegoods Efficiency Trends in Australia 1993-2014. 2016, Department of Innovation, Industry and Science

[8] http://goodshepherdmicrofinance.org.au/media/energy-efficiency-program-drive-financial-inclusion/

[9] Pikkety, T, 2015, About "Capital in the Twenty-First Century", The American Economic Review

[10] California Alternate Rates for Energy (CARE): http://www.cpuc.ca.gov/General.aspx?id=976

[11] Low Income Household Rebate: https://www.service.nsw.gov.au/transaction/apply-low-income-household-rebate-supply-customers

[12] Owen, G, 2005, Sustainable development duties: New roles for UK economic regulators, Utilities Policy

[13] https://theconversation.com/australia-imports-almost-all-of-its-oil-and-there-are-pitfalls-all-over-the-globe-97070

[14] https://theconversation.com/a-high-price-for-policy-failure-the-ten-year-story-of-spiralling-electricity-bills-89450

[15] http://ieefa.org/ieefa-australia-a-gas-cartel-run-amuck/

[16] For example: http://www.sydneyrenewable.com/, https://www.energy.vic.gov.au/renewable-energy/community-energy

[17] For example, Okra Solar: http://www.okrasolar.com/