Commercial Battery Storage Benefits

Commercial Battery Storage

Commercial battery storage offers businesses several distinct financial benefits, from reducing peak-time electricity charges to generating income through grid services. This page provides an overview of the main opportunities.

Please note that commercial battery storage is a specialist area and the market evolves quickly. If you are considering a commercial installation, please get in touch directly to discuss your specific situation.

The Grid under Pressure

The UK's electricity grid is undergoing significant transformation. As older fossil fuel generation is decommissioned and renewable energy, which is inherently variable, makes up an ever-larger share of supply, the ability to store and dispatch electricity flexibly is becoming increasingly valuable. The government is targeting between 23GW and 27GW of installed battery storage capacity by 2030 as part of its Clean Power strategy, and commercial-scale batteries are central to that ambition.

Income from Grid Services

Businesses with larger battery installations (typically 50kW and above) can generate income by making their battery capacity available to the grid through two main mechanisms:

The Capacity Market provides payments to businesses that can guarantee available capacity on demand, helping the grid manage periods of peak demand. Contracts are awarded via annual auction.

The Capacity Market is designed to support the development of active demand management whilst providing payment for reliable sources of capacity. Contracts are available via annual auction, and the capacity must be available on standby 24 hours a day, 7 days a week. Battery storage is well suited to this requirement given its ability to respond almost instantaneously. 

Frequency Response services pay businesses to help the grid maintain stable frequency in real time. Batteries are well suited to this, they can respond within seconds, far faster than conventional generation.

Batteries are particularly well suited to Firm Frequency Response (FFR). Primary response must be delivered within 10 seconds and secondary response within 30 seconds, with response sustained for up to 30 minutes. Both are well within the capability of modern battery systems.

Most businesses cannot enter the Frequency Response market directly, as doing so currently requires a minimum of 10MW of capacity. Instead, businesses participate via an Aggregator, a specialist organisation that pools capacity from multiple sites to reach the threshold required to tender for grid service contracts. Spirit works with a select number of Aggregators; we tender each opportunity to them and, depending on their appetite, they submit an income proposal for the battery asset. The selected Aggregator then contracts directly with the battery owner.

If you would like to explore grid services income for your site, please call us on 0118 951 4490 or email commercial@spiritenergy.co.uk.

Time-Shifting Peak Charges

Half-hourly metered businesses pay higher distribution charges for electricity consumed during peak periods, typically 4pm to 7:30pm on weekdays. By storing electricity outside these windows and drawing on the battery during the peak, businesses can reduce these charges meaningfully.

The same approach also helps manage TRIAD charges, transmission costs based on a site's consumption during the three periods of highest national grid demand each winter. Reducing demand during likely TRIAD windows by drawing on stored energy rather than the grid can produce significant savings for higher-consumption sites.

UPS and Backup

Commercial battery systems can also provide Uninterrupted Power Supply (UPS) functionality, with response times as fast as 20 milliseconds. They can replace or supplement diesel backup generators, and offer protection against brownouts and brief supply interruptions.

On-site battery storage can also be used to supply increased power to a site during periods of peak demand, deferring or avoiding the need to upgrade the grid connection. For businesses where connection capacity is a constraint on growth or operations, this can represent a significant cost saving. 

Carbon Footprint

Using and storing electricity on site reduces transmission losses and lowers a business's reliance on grid electricity at peak times, when the carbon intensity of grid power tends to be highest. For businesses with corporate sustainability commitments, on-site storage supports measurable progress against carbon reduction targets.