{"id":3263,"date":"2023-03-16T13:15:52","date_gmt":"2023-03-16T12:15:52","guid":{"rendered":"https:\/\/wpethzprd.ethz.ch\/energy\/?p=3263"},"modified":"2025-03-27T16:14:24","modified_gmt":"2025-03-27T15:14:24","slug":"why-and-how-to-put-demand-side-flexibility-at-the-heart-of-the-zero-carbon-electricity-transition","status":"publish","type":"post","link":"https:\/\/blogs.ethz.ch\/energy\/why-and-how-to-put-demand-side-flexibility-at-the-heart-of-the-zero-carbon-electricity-transition\/","title":{"rendered":"Why and how to put demand-side flexibility at the heart of the zero-carbon electricity transition"},"content":{"rendered":"\t\t
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By Christine Gschwendtner<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Christine\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Christine Gschwendtner<\/span><\/a> has recently finished her PhD in the Group for Sustainability and Technology at ETH Zurich and is now a Postdoctoral Researcher at Harvard University. Her research focuses on how to support the adoption and integration of low-carbon technologies with focus on sector coupling and heterogeneous behavioral aspects. Current research projects investigate incentives for leveraging the spatial-temporal flexibility of electricity demand, particularly related to electrification, e.g., electric vehicles\/vehicle-to-grid and heat pumps.<\/span><\/p>

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Electricity systems require more and more flexibility to integrate increasing shares of variable renewable electricity and avoid costly grid expansion. The demand side – involving electricity end-users – will be key in providing relatively cheap flexibility. Looking beyond the technical aspects is crucial to leverage this potential; namely, by addressing social and regulatory challenges. Effective compensation mechanisms for providing flexibility and procurement strategies for different services, particularly at the distribution grid level, need to be established while enabling the participation of small flexibility providers.<\/h3>

The need for flexibility and why the demand side is crucial<\/b><\/p>

Accelerating the deployment of variable wind and solar electricity and electrifying transport and heating<\/span> increases the <\/span>challenge of ensuring that supply can meet demand<\/span><\/a> at any time. For instance, solar electricity generation is highest during midday whereas electric vehicles (EVs) can increase the evening<\/span> peak demand<\/span><\/a> (Figure 1). To balance electricity supply and demand, an increasing amount of flexibility is required, which is one of the key challenges for the transition to a zero-carbon electricity system. <\/span>Flexibility<\/span><\/a> is the <\/span>change in<\/span><\/a> feed-in or withdrawal of electricity, which can provide different services. Examples of flexibility services include transmission grid services, e.g.,<\/span> maintaining grid frequency<\/span><\/a>, distribution grid services, e.g.,<\/span> voltage control<\/span><\/a> or<\/span> congestion management<\/span><\/a>, or services for energy suppliers, e.g., <\/span>curtailment reduction<\/span><\/a>. <\/span><\/p>

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Figure 1:<\/strong> The challenge of balancing electricity supply and demand with increased shares of variable renewables (left) and electrification (right). The peak of the supply (left) and demand curve (right) are misaligned by a few hours (short-term flexibility). Data for supply from<\/span><\/i> Smard.de<\/span><\/i><\/a>; <\/span>data<\/span><\/i><\/a> for demand (own figure)<\/span><\/i><\/div>
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These services can be provided by <\/span>four main sources<\/span><\/a> of flexibility and Figure 2 indicates their relative costs and maximum share of variable renewable electricity supply. Future electricity systems likely require a mix of these flexibility sources as they can complement each other.<\/span><\/p>

– \u00a0 <\/span> Demand-side flexibility<\/b> stands out for its relatively<\/span> low costs and can facilitate<\/span><\/a> high variable renewable electricity supply by providing short-term flexibility. For example, EVs can<\/span> shift their charging<\/span><\/a> to midday or<\/span> feed-in electricity<\/span><\/a> from their batteries at times of high demand by using vehicle-to-grid (V2G). <\/span>Low infrastructure costs<\/span><\/a> (e.g., digitization of grids, smart meters) lead to an advantage compared to other flexibility sources, e.g., storage technologies. While<\/span> industry<\/span><\/a> has participated in demand-side flexibility for decades, the increasing diffusion of <\/span>EVs<\/span><\/a> and heat pumps leads to a high flexibility potential for residential and commercial customers, supporting the integration of high shares of variable renewable electricity.\u00a0<\/span><\/p>

– \u00a0 <\/span> Demand-side flexibility will be increasingly valuable as <\/span>flexible generation<\/b> declines as a traditional flexibility source because fewer flexible power plants are included in a system with an increasing share of renewable electricity supply. Regarding costs, flexible power plants are currently available at relatively low costs but will have <\/span>lower load-factors<\/span><\/a> in a system with high shares of renewable electricity, which <\/span>increases costs<\/span><\/a>. Additionally, the curtailment of wind or PV electricity supply is <\/span>costly and can increase emissions<\/span><\/a>. Therefore, flexible generation is an increasingly<\/span> economically and environmentally unattractive<\/span><\/a> flexibility source.<\/span><\/p>

– \u00a0 <\/span> Transmission grids<\/b> can transport electricity to different areas and thereby balance supply and demand across areas, including between countries with interconnections. While the use of existing transmission grids can be<\/span> improved<\/span><\/a>, expansion costs can be high but would still be<\/span> much lower<\/span><\/a> than overbuilding renewables and energy storage to reach the same decarbonization goals. However, with high shares of renewable electricity in neighboring areas, excess electricity might occur simultaneously, limiting the potential of transmission grids as a flexibility source.<\/span><\/p>

– \u00a0 <\/span> Storage can provide centralized (e.g.,<\/span> pumped hydro storage<\/span><\/a>) or distributed (e.g., residential battery storage) flexibility. Grid-scale battery storage is increasingly used for short-term balancing. Although storage will be important, its<\/span> scale and associated costs<\/span><\/a> depend on the use of other flexibility sources, particularly demand-side flexibility, which can also act as distributed storage.<\/span><\/b><\/p>

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Figure 2:<\/strong> Flexibility sources in electricity systems. Demand-side flexibility shows relatively low costs and can facilitate high shares of variable renewable electricity supply. The relative order is conceptual only and actual costs and availability might deviate. Adapted from<\/span><\/i> NREL<\/span><\/i><\/a> and<\/span><\/i> IEA<\/span><\/i><\/a>.<\/span><\/i><\/div><\/div><\/div><\/div>
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Overall, the demand side shows high potential for providing short-term flexibility at low costs for systems with high shares of variable renewable electricity supply, outperforming several other flexibility sources. So, why is demand-side flexibility not yet widely implemented beyond pilot projects?\u00a0<\/span><\/p>

Challenges for demand-side flexibility and steps forward<\/b><\/p>

There are two main challenges for advancing residential demand-side flexibility: social and regulatory. However, both can be overcome with targeted actions:\u00a0\u00a0<\/span><\/p>

  1. Social challenge<\/b>: Demand-side flexibility<\/span> depends on user behavior<\/span><\/a>, which cannot be fully controlled. As the reaction to price signals is uncertain because users might<\/span> not change their behavior<\/span><\/a> due to perceived<\/span> inconvenience<\/span><\/a>, habits or personal preferences, grid operators consider demand-side flexibility as unreliable. Would you be willing to let your EV charge and discharge while you don\u2019t need it? At the same time,<\/span> justice concerns<\/span><\/a> arise as low-income households may be excluded from flexibility provision and the associated financial benefits.<\/span>
    <\/span>Steps forward: <\/span><\/i>Pilot projects have shown that<\/span>     compensation is important<\/span><\/a> for mass participation in demand-side flexibility. Consequently, appropriate price signals should be developed that are<\/span> simple enough<\/span><\/a> to support their adoption while incorporating trade-offs<\/span> between flexibility services across transmission, distribution, and generation levels.<\/span> Due to diverse users and behaviors, there<\/span> might not be a one-size-fits-all solution<\/span><\/a> to incentivizing demand-side flexibility and considering low-income groups is crucial. Experimenting with<\/span> opt-in<\/span><\/a> (the users need to choose to participate) versus opt-out (the users need to choose to <\/span>not<\/span> participate) concepts could gain more insights on how to maximize user choice while maximizing demand-side flexibility. To increase reliability of demand-side flexibility,<\/span> portfolios<\/span><\/a> of different technologies (e.g., EVs and heat pumps) and diverse user types (e.g. different socio-demographic groups, commercial and residential users) can balance variations of flexibility provision by different users.

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  2. Regulatory challenge<\/b>: Even if users would be willing to widely participate in demand-side flexibility, regulatory barriers need to be removed to unlock demand-side participation. Two key barriers are the restricted participation of small providers and developing procurement strategies for different flexibility services. Small providers might not be able to fulfill flexibility market requirements, such as being able to provide a certain <\/span>amount of power<\/span><\/a> for a given duration, e.g., 1 MW for <\/span>4 hours<\/span><\/a>. While the procurement of flexibility is long established at transmission level, it is<\/span> unclear<\/span><\/a> how flexibility can be acquired at distribution level.
    <\/span>Steps forward:<\/span><\/i> To enable the participation of small providers, aggregators can pool several small flexibility providers to participate collectively in the markets. Some countries have already shortened the durations, e.g., to 4h in the frequency curtailment market in<\/span>     Denmark<\/span><\/a> and<\/span> Germany<\/span><\/a>. Where markets are not yet established, different options are currently tested in<\/span> pilot projects<\/span><\/a>: markets, time-varying electricity prices, auctions or tenders, e.g., the flexibility platform<\/span> piclo<\/span><\/a>. <\/span>Starting behind-the-meter<\/span><\/a> by, e.g., optimizing EV charging with roof-top PV supply, can avoid the grid interface while developing solutions for other flexibility services.<\/span><\/li><\/ol>

    Demand-side flexibility has the potential to be an effective and cost-competitive way to integrate variable renewable electricity and avoid grid expansion needs. However, to leverage its potential, the focus needs to shift beyond the technical components, recognizing the strong dependence on social aspects while removing regulatory barriers. Crucial next steps are therefore developing effective compensation mechanisms for different flexibility services and diverse users as well as establishing procurement strategies for flexibility of small providers, particularly at distribution level. <\/span><\/p>

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    Cover photo by \u00a9 [Jiri Hera] \/ Adobe Stock<\/span><\/p>

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    Keep up with the Energy Blog @ ETH Zurich on Twitter @eth_energy_blog<\/a>.<\/em><\/p>

    Suggested citation: Gschwendtner,\u00a0<\/span>Christine<\/span><\/em>. \u201cWhy and how to put demand-side flexibility at the heart of the zero-carbon electricity transition<\/em>\u201d, Energy Blog @ ETH Zurich, ETH Zurich,\u00a0March 16, 2023,<\/i> https:\/\/blogs.ethz.ch\/energy\/why-and-how-to-put-demand-side-flexibility-at-the-heart-of-the-zero-carbon-electricity-transition\/<\/a><\/p>

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    If you are part of ETH Zurich, we invite you to contribute with your findings and your opinions to make this space a dynamic and relevant outlet for energy insights and debates. Find out how you can contribute<\/a> and contact the editorial team here<\/a> to pitch an article idea!
    <\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    Electricity systems require more and more flexibility to integrate increasing shares of variable renewable electricity and avoid costly grid expansion. The demand side – involving electricity end-users – will be key in providing relatively cheap flexibility. Looking beyond the technical aspects is crucial to leverage this potential; namely, by addressing social and regulatory challenges. Effective compensation mechanisms for providing flexibility and procurement strategies for different services, particularly at the distribution grid level, need to be established while enabling the participation of small flexibility providers.<\/p>\n","protected":false},"author":46794,"featured_media":3291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[264264],"class_list":["post-3263","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-renewable-energy"],"yoast_head":"\nWhy and how to put demand-side flexibility at the heart of the zero-carbon electricity transition - Energy Blog @ ETH Zurich<\/title>\n<meta name=\"description\" content=\"Electricity systems require more and more flexibility to integrate increasing shares of variable renewable electricity and avoid costly grid expansion. The demand side - involving electricity end-users - will be key in providing relatively cheap flexibility. Looking beyond the technical aspects is crucial to leverage this potential; namely, by addressing social and regulatory challenges. Effective compensation mechanisms for providing flexibility and procurement strategies for different services, particularly at the distribution grid level, need to be established while enabling the participation of small flexibility providers.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.ethz.ch\/energy\/why-and-how-to-put-demand-side-flexibility-at-the-heart-of-the-zero-carbon-electricity-transition\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why and how to put demand-side flexibility at the heart of the zero-carbon electricity transition - Energy Blog @ ETH Zurich\" \/>\n<meta property=\"og:description\" content=\"Electricity systems require more and more flexibility to integrate increasing shares of variable renewable electricity and avoid costly grid expansion. The demand side - involving electricity end-users - will be key in providing relatively cheap flexibility. Looking beyond the technical aspects is crucial to leverage this potential; namely, by addressing social and regulatory challenges. 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