Democratising energy: the rise of DERs

August 30, 2019

At 16.52 on Friday 9th August the UK electricity grid experienced its worst blackouts in over a decade.  National Grid’s preliminary report states the incident was caused by a lightning strike, followed by the almost simultaneous failure of two generation plants – one gas, one wind – totalling almost 1.4GW, which saw frequency plummet to below 48.8Hz.

While National Grid’s systems kicked in and frequency was restored by 16.57 the country experienced severe disruption for many hours as transport and road networks were affected throughout the evening rush-hour. A full report is due by Friday 6 September.

There are undoubtedly lessons to be learned from this event, but one thing of note is that of the 1,240 MW of response National Grid instructed to help stabilise the system, 475MW came from battery energy storage.

These batteries, both behind-the-meter and grid-scale, responded in milliseconds to provide flexible capacity when it was most needed, and in the process earned valuable income for their owners. Forecasts by Solar Media suggest that by the end of 2019 National Grid could have up to 1.2GW of operational energy storage to call upon in the UK – almost enough to have dealt with the whole event.

Battery energy storage system at Cenin Renewables

Driving forces

The rise of battery energy storage is part of a wider transformation underway in global energy systems, driven by four major economic trends – often referred to as the 4Ds. These are:    

  • Decarbonisation – climate change requires rapid growth and adoption of renewable energy worldwide, which requires greater flexibility at a system level
  • Digitalisation – the evolution of smart tech allows complex systems to be operated remotely
  • Decentralisation – the energy landscape is moving from a centralised system to a distributed network of assets
  • Democratisation – distributed energy systems empower individuals to control their consumption and participate in the energy network

The democratisation of energy arises from the first three Ds and is only really now starting to gain momentum, but there is huge potential to be unlocked, and stationary energy storage of the kind described above is only one piece of the puzzle.

Electric vehicles, self-generation and the ability to connect, control and optimise all kinds of energy-consuming assets means consumers – whether at the businesses or domestic level – have a huge role to play in the energy transformation.

As one of the UK’s longest-standing Demand Side Response aggregators, and a provider of Distributed Energy Resource Management Systems (DERMS) to utility partners worldwide, Kiwi Power has been at the forefront of this movement since 2009.

The opportunity for businesses

In the UK we work with large energy users of all kinds – from hospitals, universities and hotels to water utilities, metal manufacturers and mining companies. We use our technology and expertise to analyse, operate and optimise their energy assets to maximise cost and carbon savings from a range of markets and programmes.

These assets include chillers, pumps, air conditioning units, standby generation, Combined Heat and Power (CHP), heat pumps and of course, battery energy storage systems.

Internationally we work with utility partners who license our technology platform to deliver their own Distributed Energy Resource (DER) products and services to their end user customers. Collectively we manage over 1GW of DERs on behalf of our partners in over 10 countries.

Ultimately the driver for large energy users is money. With many spending tens of millions of pounds on energy each year, finding smarter ways to manage and control energy use can make a huge difference to a company’s bottom line.

At its simplest, this can just be a matter of reducing demand when electricity is at its most expensive and shifting load to cheaper times of day. More sophisticated is thinking about how an asset can ‘stack’ revenue streams by participating in multiple markets, for example, providing ancillary services to the system operator at certain times of day while also responding to peak prices signals and seeking arbitrage opportunities in wholesale energy markets. Ultimately, the best approach is a holistic view which operates across a company’s assets and sites to determine the most optimal outcome, which may involve managing generation, storage and consumption assets in unison.

Either way, our experience has shown us that the key considerations for businesses remain the same. How easy is it to integrate the technology? Can I trust my aggregator not to affect my asset or processes? Can I see what my asset is doing? Can I build a reliable business case?

Key to the last point is whether markets and regulation are fit for purpose. Most countries have built their energy systems around large, centralised assets funded over 20-year time horizons with minimal competition. They have not been designed to accommodate many thousands of DERs able to respond autonomously at different speeds for different durations.

Scaling the opportunity

The UK Demand Side Response market is probably one of the most mature markets of its kind, and it is still grappling with a lot of these issues.

Energy users are becoming increasingly sophisticated, so most now understand the concept of demand side response and how a smarter, more flexible approach can benefit them, but the current state of play means many have been left wondering whether the pain is worth the gain.

While the technology exists to seamlessly connect and operate assets, markets, regulation and customer propositions need to catch up. Too often DSR providers find themselves trying to operate within the rules of a game skewed firmly in the favour of large incumbents or trying to navigate disjointed policy reforms, while end users find the complexity of the different programmes off-putting.

In the UK for example, reforms to network charging look likely to remove the incentive to shift demand out of peak periods, while National Grid’s Balancing Mechanism is still only accessible to businesses with an electricity supply license, a huge barrier to entry.

The good news is reforms are coming, and incidents like August’s blackout show just how big a role DERs can play in helping system operators to ‘firm’ renewable generation and balance supply and demand. For utilities, DSR provides an opportunity to cement the customer relationship and add value to their proposition. Energy-as-a-Service packages, which deliver cost savings for a bundled offering can give end users the certainty of savings they need without the hassle factor of understanding different DSR markets and programmes.

One thing is for certain, with global DER capacity forecast to reach over 500 GW by 2028[1] – and outpace the deployment of new centralised generation capacity from 2024 – the democratisation of energy looks set to continue.

[1]Navigant Research Global DER Deployment Database 2019