Imagine a motorway at rush hour. Rather than building more lanes every time traffic gets heavy, you offer drivers a reason to travel at quieter times instead. Demand response works the same way for electricity. Instead of firing up extra power stations when everyone boils the kettle at 5pm, the grid sends signals asking users to shift their consumption to a different time – or briefly reduce it altogether.
Demand response is the deliberate adjustment of electricity consumption by end users in response to a signal from the grid operator, a supplier or a price change. That signal might be a request to use less power during a winter evening peak, or an incentive to charge a heat pump hot water tank overnight when wind is plentiful and prices are low. The goal is always the same: balance supply and demand without building more generation capacity.
🔌 Why Demand Response Matters in Ireland
Ireland’s electricity system faces unique pressures. The grid is small and isolated, wind generation can swing from full output to near zero in hours, and demand is growing rapidly as heat pumps, electric vehicles and data centres come online. The Climate Action Plan 2023 set interim targets of 15-20% demand side flexibility by 2025 and 20-30% by 2030. When the CRU published its first National Energy Demand Strategy (NEDS) in July 2024, it estimated that Ireland’s current demand flexibility sits at roughly 5% of average daily consumption – a low starting point that leaves a significant gap to close.
That gap matters because every megawatt of demand shifted away from peak hours is a megawatt that does not need to come from a gas-fired power station. It also reduces curtailment – the waste of wind energy that happens when there is too much renewable generation and not enough demand to absorb it. In a system targeting 80% renewable electricity by 2030, flexible demand is not optional. It is infrastructure.
🔌 How Demand Response Works on Ireland’s Grid
⚡ Demand Side Units in the Wholesale Market
Ireland’s formal demand response programme operates through Demand Side Units (DSUs) in the Single Electricity Market (SEM). A DSU is one or more industrial or commercial sites that can reduce their electricity consumption when instructed by EirGrid, the transmission system operator. The minimum capacity to register as a DSU is 4 MW, and individual sites with 10 MW or more must register as standalone units rather than being aggregated.
DSUs are typically managed by third-party aggregators – specialist companies such as GridBeyond, Enel X, PowerHouse and Statkraft – who contract with individual demand sites, bundle their capacity and handle real-time communication with EirGrid. When dispatched, a DSU has one hour to deliver its demand reduction and must sustain it for at least two hours. The reduction can come from on-site generation, plant shutdown or a combination of the two.
DSUs participate in the SEM capacity auctions alongside conventional generators and battery storage systems, receiving regular payments for each MW of capacity they make available. This participation dates back to 2007, though significant uptake only began after 2012. Ireland had previously operated the Winter Peak Demand Reduction Scheme (WPDRS) for over a decade, delivering average reductions of 80-120 MW during weekday evening peaks.
⚡ DS3 System Services and the Shift to FASS
Beyond the capacity market, demand response providers can earn revenue through system services. The DS3 programme, operational since 2018, procured 12 distinct services to keep the grid stable as renewable penetration increased toward the 75% SNSP limit. DSUs that can provide fast frequency response or operating reserves receive tariff-based payments for their availability.
EirGrid is now transitioning from DS3 to FASS (Future Arrangements for System Services). The centrepiece is a Day-Ahead System Services Auction (DASSA) that will replace six-monthly procurement gates with daily competitive auctions. This shift should drive down costs and give flexible demand providers more frequent opportunities to compete. The existing DS3 arrangements have been extended to April 2026 to bridge the gap.
🔌 Smart Meters and Household Demand Response
Industrial DSUs are only part of the picture. For households, demand response starts with the smart meter. ESB Networks has installed over two million smart meters across Ireland, covering more than four out of five premises. These meters record electricity usage every 30 minutes, providing the data foundation that makes time-of-use tariffs possible.
All electricity suppliers must now offer a time-of-use tariff to customers with smart meters. These tariffs charge different rates depending on when electricity is used – typically splitting the day into peak (late afternoon and evening), day and night bands. However, uptake has been slower than hoped. As of mid-2024, only around 175,000 accounts had switched to a smart tariff, representing roughly 11% of smart meter customers. The CRU acknowledged that the 2025 flexibility target is unlikely to be met.
To accelerate progress, the CRU directed the five largest electricity suppliers (those with over 200,000 customers) to offer a Standard Dynamic Price Contract. The deadline for these tariffs is June 2026. Unlike fixed time-of-use bands, dynamic tariffs will reflect the actual day-ahead wholesale market price at half-hourly intervals, giving consumers a direct financial incentive to shift consumption to periods of high wind and low demand.
🔌 Beat the Peak and ESB Networks Flexibility
ESB Networks launched its Beat the Peak programme in October 2022 as a direct response to security of supply concerns. The domestic element, branded “Is This a Good Time?”, invites all electricity customers to sign up for personalised alerts about when to reduce or shift their usage. Nearly 40,000 households have enrolled, earning rewards for taking action during energy events – reducing consumption at peak times or shifting usage to periods of high renewable generation. The programme continues until at least March 2027.
On the commercial side, ESB Networks’ Beat the Peak Business scheme pays eligible businesses to reduce demand during the 5-7pm peak window on weekdays. This groundwork led to a larger ambition: in July 2024, the CRU approved ESB Networks to procure up to 500 MW of demand flexibility products across the distribution network by 2030. The first batch, targeting 109 MW at specific grid locations experiencing congestion, is being tendered in 2025. Contracts will run for up to 15 years, with performance-based payments and a revenue-sharing model where 50% of net revenues earned in other markets are returned to consumers.
🔌 What Demand Response Means for You
If you have a smart meter and a heat pump, electric vehicle or solar panel system with a battery, you already have the building blocks for household demand response. Shifting hot water heating to overnight hours, charging your EV when wind output is high, or exporting stored solar energy during the evening peak all count – and all can reduce your bills while lowering your carbon footprint.
For businesses, the opportunity is more structured. Companies with flexible processes – cold storage, water treatment, manufacturing lines that can pause briefly – can earn revenue by registering with a DSU aggregator. As Ireland pushes toward net zero, the value of flexibility will only increase. The CRU’s NEDS identified 53 actions to unlock demand flexibility across all customer groups, and the regulatory architecture is being built to reward those who participate.
❓ Frequently Asked Questions
🌿 What is the difference between demand response and energy efficiency?
Energy efficiency means using less electricity overall – insulating your home, switching to LED bulbs or upgrading appliances. Demand response does not necessarily reduce total consumption. Instead, it shifts when you use electricity, moving demand from expensive, carbon-intensive peak periods to cheaper, cleaner off-peak times. Both reduce emissions, but they work in different ways.
🌿 Do I need a smart meter for demand response?
For household demand response through time-of-use or dynamic tariffs, yes. Smart meters record consumption at half-hourly intervals, which is the data your supplier needs to bill you at different rates throughout the day. Over two million smart meters have been installed in Ireland and the rollout is continuing. Installation is free and carried out by ESB Networks.
🌿 Can demand response cause power cuts or affect my comfort?
No. Household demand response is entirely voluntary – you choose whether to shift your consumption in response to price signals or alerts. Nobody can remotely switch off your appliances. For industrial DSUs, participation is contractual and planned, with the site controlling how it delivers the agreed reduction. The aim is to make the grid more reliable, not less.
🌿 How much can I save with a time-of-use tariff in Ireland?
Savings depend on how much consumption you can shift to off-peak hours. The CRU has noted that standard smart tariffs are now cheaper than traditional flat-rate or day/night tariffs for many customers. Households that charge EVs overnight, run appliances outside peak hours and use heat pumps with smart controls can see meaningful reductions. The introduction of dynamic tariffs from 2026 will create sharper price differences between windy and calm periods, rewarding flexible consumers further.