Smart batteries · Scotland-wide
Battery arbitrage for Scottish homes
Charge a home battery on cheap overnight power and run your home on it through the Scottish evening peak. We compare tariffs, software and VPPs, then install through MCS-certified partners.
Installations are carried out by our accredited installation partner, Home Heating Services (Scotland) Ltd — MCS certified (IAA10151), TrustMark registered (3559930), Gas Safe registered (559575).
Agile overnight, Q2 2026
~7p/kWh
Agile peak, Q2 2026
~35p/kWh
- Installed through our MCS-certified partners
- Finance available, subject to status
- Local Scottish office in Dundee
- No-obligation home survey
Quick answer
What is battery arbitrage, and does it work in Scotland?
Battery arbitrage means charging a home battery when electricity is cheapest, usually overnight, and using that stored power when prices peak in the early evening. In Scotland, smart tariffs such as Octopus Agile make the daily price gap clear. We compare tariffs, software and VPPs, and install through MCS-certified partners.
Last updated:
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Three quick steps, then a survey and a written no-obligation quote.
No obligation · We install through MCS-certified partners · Scottish homes and businesses
Prefer to talk? Call 0141 230 0198 or WhatsApp us.
Peak vs off-peak
The price of electricity changes every half hour
A typical day on Octopus Agile. Your battery buys in the teal hours and covers your home through the red ones.
- Cheap
- Standard
- Peak
Illustrative Octopus Agile national average profile, Q2 2026. Real Agile prices change every day.
Overnight low (01:00–05:00)
5.6p
Evening peak (17:00–20:00)
27.8p
Daily spread, low to high
30p
Gap kept per kWh, after losses
≈ 18.8p per kWh shifted
How battery arbitrage works
Buy low, use high. Every day.
Battery arbitrage means charging a home battery when electricity is cheap and selling it back when the price rises. In Scotland on Octopus Agile, the spread between off-peak and peak reached seventeen to thirty-seven pence per kilowatt-hour in the second quarter of 2026. The battery keeps that gap, minus small charging losses. A no-obligation survey gives figures for your home. This site compares the aggregators, software and hardware that make it work.
See the full processStep 1
Charge when power is cheap
Your battery fills up overnight, when smart tariffs like Octopus Agile often drop to around 5–7p per kWh (Octopus Agile typical overnight rates, Q2 2026).
Step 2
Run your home at peak
Between roughly 4pm and 8pm, your home runs on stored power instead of buying from the grid at peak rates, which on Agile often passed 30p in Q2 2026.
Step 3
Export the surplus
Spare energy can be sold back on an export tariff or through a virtual power plant, earning you money.
Arbitrage calculator
How does a home battery earn from arbitrage?
A battery earns from the gap between the price you charge at and the price you avoid at peak, after round-trip losses. The wider that gap and the more energy you shift, the stronger the case — a no-obligation survey turns this into figures for your home.
Adjust the sliders to see how battery size, tariff gap and cycling change the energy you shift and the gap you keep. This explains the principle; it is not a savings estimate.
14.1p / kWh
Peak rate after 88% round-trip efficiency, minus the off-peak rate.
Energy shifted to peak
2,990 kWh / year
Allows for losses and a 0.93 capacity factor over the battery's life.
A gap of 10p or more per kWh after losses is generally a workable starting point for arbitrage. Standing charges, your usage pattern and any solar change the picture, so a no-obligation survey gives figures for your home.
Want figures for your home?
Cite or embed this calculator
You may reference this tool freely. Please credit the source:
Battery Arbitrage Calculator — batteryarbitrage.co.uk, August 2026. <a href="https://batteryarbitrage.co.uk/#calculator">batteryarbitrage.co.uk</a>Default rates: typical Octopus Agile off-peak and peak rates (national average, Q3 2026). RTE 0.88. Updated August 2026.
Market guide
Everything to compare before you invest
Aggregators, hardware, software and tax. Pick a topic.
UK VPP aggregators
Which UK VPP aggregators can I join?
Six aggregators operate in the UK, each paying for your battery's flexibility in a different way — bill credit, cash or an export tariff. Which suits you depends on your hardware and tariff.
A Virtual Power Plant (VPP) aggregates hundreds of home batteries and sells their combined flexibility to the grid. Joining a VPP can add a second income stream on top of arbitrage; a no-obligation survey gives figures for your home. This directory compares six UK aggregators by payment, hardware compatibility, and minimum system size.
A complete comparison of UK Virtual Power Plant (VPP) aggregators. Compare payment structures, hardware compatibility and minimum system sizes.
Octopus Energy
Saving Sessions
Min. system size
1 kWh
Payment type
Bill credit
Compatible hardware
Best for Agile tariff users. Automatic dispatch. No hardware lock-in.
Kraken Flex
Kraken Flex VPP
Min. system size
3 kWh
Payment type
Cash
Compatible hardware
Commercial focus. Capacity market revenue stacking. DNO flexibility.
Tesla VPP
Virtual Power Plant
Min. system size
Powerwall 2+
Payment type
Bill credit
Compatible hardware
Tesla ecosystem only. Intelligent dispatch via Autobidder AI.
Independent VPP programme
Smart Export Guarantee
Min. system size
5 kWh
Payment type
Export tariff
Compatible hardware
Closed ecosystem. Compatible hardware is limited. Check current export terms before modelling returns.
OVO Energy
OVO Beyond
Min. system size
2 kWh
Payment type
Bill credit
Compatible hardware
Limited dispatch frequency. Good entry-level program for new battery owners.
Energise
Flex Capacity
Min. system size
10 kWh
Payment type
Cash
Compatible hardware
Scotland-focused. Triad avoidance revenue. Commercial scale preferred.
Scotland recommendation
For Scotland-based installations on Octopus Agile (regions N and P), the Saving Sessions programme is usually the simplest starting point, because it works alongside Agile arbitrage without extra hardware. Grid connection notification (G99) must be filed with the relevant DNO: SP Energy Networks for the central belt and south, SSEN for the Highlands and islands. We handle G98/G99 paperwork as part of every installation. Contact Scottish Energy Efficiency for a tailored assessment.
Battery buying guide · 2026
Which home battery is best for arbitrage in 2026?
There is no single best battery — usable capacity, inverter compatibility, tariff access and warranty terms matter more than brand, so a no-obligation survey gives the right answer for your home.
There is no universally best battery for arbitrage: usable capacity, inverter compatibility, tariff access, export rules, and warranty terms matter more than the headline brand. This factual comparison helps you shortlist a system before a no-obligation survey.
Source: manufacturer specifications; checked August 2026.
| Battery | Nominal capacity | Warranty | Typical fit |
|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 10 years | Tesla ecosystem |
| Hanchu ESS battery | Varies by model | 10 years standard | Hanchu ESS ecosystem |
| Modular LiFePO4 battery | Varies by module count | Varies by manufacturer | Check inverter compatibility |
When is battery arbitrage not worth it?
Arbitrage may not be worthwhile where tariff spreads are small, the system is regularly cycled outside its warranty assumptions, export limits prevent useful discharge, or the installation cost is too high for the expected annual return. A no-obligation survey and current tariff data are needed before making an investment decision.
Want a tailored assessment?
Automation tools
What software automates battery arbitrage?
Five platforms handle automated dispatch, from open-source Home Assistant to tariff-bundled Octopus Intelligent — the best choice depends on your inverter and how hands-on you want to be.
Five automation platforms compared for battery arbitrage capability. Assessed on Octopus Agile integration, VRV dispatch, API access, and multi-inverter support.
Hanchu ESS controls
ProprietarySupplied with compatible hardware
Pros
Designed for compatible battery dispatch and real-time monitoring.
Cons
Works only with compatible Hanchu hardware.
Home Assistant
Open SourceOpen source (self-hosted)
Pros
Most flexible platform. Multi-inverter support. Huge community. Octopus integration via HACS.
Cons
Requires technical knowledge. Setup time investment.
Octopus Intelligent
Tariff-bundledBundled with Octopus tariff
Pros
Zero configuration. Automatic off-peak charging. Best for EV + battery combos.
Cons
Limited to Octopus customers. No export optimisation. Closed system.
Inverter manufacturer controls
ProprietaryIncluded with hardware
Pros
Good monitoring. DC-coupled efficiency. Strong warranty support.
Cons
Tied to one manufacturer. Limited tariff automation.
Zappi / Eddi (myenergi)
Hardware + AppSeparate hardware purchase
Pros
Best for solar diversion. Open API. Good HA integration. UK-made.
Cons
Not primarily a battery arbitrage tool. Limited tariff switching.
Interactive · No data captured
When do you generate power versus when do you use it?
Solar panels generate most power midday, but households use most power morning and evening — a battery bridges that gap and lets you sell the surplus at peak rates.
This is the core problem a battery solves. Solar generates during the day; you use power morning and evening. Move the slider to add storage and watch the gap close — or not, if the numbers don't work for your setup.
Move the slider to add a battery and see how the numbers change.
Source: MCS MIS 3002 (generation), Ofgem TDCV (consumption), Octopus Agile national average Q2 2026 (prices). 0.88 round-trip efficiency assumed.
Market intelligence
How does UK battery arbitrage compare globally?
Australia leads on spreads. In the UK, the Octopus Agile national average spread was around 24p in Q2 2026, and Scotland is split across two Agile regions — a wider spread means each kWh you shift is worth more.
Australia offers the highest battery arbitrage spreads globally, with peaks above $2.95/kWh in South Australia. The UK national average Agile spread is 24p. Data sourced from published tariff data, Q2 2026.
Off-peak and peak price ranges across four major markets. Data sourced from published tariff data as of Q2 2026. Returns depend on the home, so we do not publish earnings figures.
United Kingdom
National average · Octopus Agile
Off-peak
5–7.5p/kWh
Peak
24–35p/kWh
Spread
17–30p
UK national average Agile spread. Scotland is covered by two Agile regions: South Scotland (N) and North Scotland (P). Export rates vary by supplier — check current terms before modelling income.
Germany
National · Tibber / aWATTar
Off-peak
8–15 c/kWh
Peak
30–60 c/kWh
Spread
22–52c
High base prices but strong renewable penetration creates good spreads. Tibber most popular.
Australia
South Australia · Amber Electric
Off-peak
5–15 c/kWh
Peak
100–300 c/kWh
Spread
Up to $2.95/kWh
Highest spreads globally due to solar penetration causing negative prices. Amber provides direct spot access.
Texas (ERCOT)
Texas, USA · Griddy / TXU variable
Off-peak
2–8 c/kWh
Peak
50–200 c/kWh
Spread
Highly volatile
Extreme volatility (Feb 2021 spike $9/kWh). No mandatory net metering. Risk of bill shock without automation.
Which Agile region is my Scottish home in?
Octopus Agile prices are set per region. South Scotland (region N) broadly matches the SP Energy Networks area: the central belt, Fife, the Borders and Dumfries and Galloway. North Scotland (region P) broadly matches the SSEN area: the Highlands, Moray, Aberdeenshire, Tayside and the islands. A wider spread between off-peak and peak gives more arbitrage potential, so check the published rates for your own postcode.
If solar PV is part of the system, MCS MIS 3002 guidance treats Scottish generation as a range rather than a promise: Glasgow is approximately 700–810 kWh per kWp per year. A no-obligation survey gives exact figures for your roof, shading, and orientation.
Source: MCS MIS 3002 methodology.
C&I battery systems
Is commercial battery storage worth it in Scotland?
Commercial systems from 50kWh to 10MWh can stack revenue across six markets — capacity, Triad, FFR, DNO flexibility, arbitrage and behind-the-meter. A site assessment gives figures for your premises.
Commercial and industrial (C&I) battery systems from 50kWh to 10MWh. Revenue stacking across multiple markets can add value. All Scottish installations require G99 grid connection notification to the relevant DNO — SP Energy Networks for the central belt and south, SSEN for the Highlands and islands. We handle the G98/G99 paperwork as part of every installation.
Small Commercial
50–200 kWh
Mid-Scale C&I
200 kWh–1 MWh
Large BESS
1–10 MWh
What revenue streams can a commercial battery access?
Capacity Market
CM T-1 and T-4 auctions. Batteries >1 MWh qualify. Clearing prices are published after each auction.
Triad Avoidance
Discharge during Triad periods (Nov–Feb, peak demand). Reduces transmission-related network charges.
FFR / BM
Frequency response and Balancing Mechanism. NGET contracts. Requires <2s response time.
DNO Flexibility
Local constraint management contracts via Piclo Flex and National Grid ESO. In Scotland, SP Energy Networks (central belt and south) and SSEN (Highlands and islands) both run flexibility tenders. We handle G98/G99 grid connection paperwork for all installations.
Energy Arbitrage
Day-ahead and intraday market trading. Automated via BEMS. Highest revenue when stacked.
Behind-the-Meter
Demand charge management. Peak shaving reduces electricity bills directly.
Interested in a commercial system assessment?
UK tax treatment
Is battery arbitrage income taxable?
Yes, once profits exceed the £1,000 trading allowance — below that, no tax return is needed and no tax is owed (HMRC, 2025/26 tax year).
Battery arbitrage income is taxable once profits exceed the £1,000 trading allowance (HMRC, 2025/26). Below that, no tax return is needed. Above it, income is treated as miscellaneous or trading income depending on scale and regularity.
How HMRC treats battery arbitrage income. Trading allowance thresholds, self-assessment obligations, and allowable expenses. Updated for 2025/26 tax year.
This is general guidance only. Consult a qualified accountant for your specific circumstances.
Trading allowance
If annual arbitrage income is under £1,000, no tax return needed and no tax owed. Applies from 6 April 2017.
Self-assessment threshold
Income over £1,000 requires self-assessment registration. Personal allowance of £12,570 means no income tax until profits exceed that threshold.
Higher rate taxpayer
If total income including arbitrage profits exceeds £50,270, the higher rate (40%) applies to the portion above this threshold.
Allowable expenses
- Electricity used for charging (metered, pro-rated)
- Battery system depreciation (capital allowances)
- Inverter and monitoring equipment costs
- Insurance attributable to the system
- Professional fees (accountant, surveyor)
- Subscription costs for automation software
- Proportion of broadband if used for monitoring
FAQs
Is battery arbitrage income taxable?
Yes, once profits exceed the £1,000 trading allowance. It is treated as miscellaneous income or trading income depending on the scale and regularity of activity.
Does the trading allowance apply to SEG (Smart Export Guarantee) payments?
SEG income is typically treated separately. HMRC considers SEG as income from property (the property generates it). The £1,000 property allowance may apply instead.
Can I claim the battery as a capital expense?
Yes. The battery qualifies for the Annual Investment Allowance (AIA) if the activity is treated as a trade. 100% first-year relief up to the AIA limit (£1M for 2025/26).
What records do I need to keep?
HMRC requires 5+ years of records: charge/discharge logs, electricity bills, bank statements showing VPP payments, and receipts for all claimed expenses.
Peer-reviewed literature
What does the academic research say about battery arbitrage?
Peer-reviewed research shows that dynamic tariff dispatch can add value to a battery, and that what a UK home battery earns depends heavily on market conditions, tariff and cycling.
9 peer-reviewed citations underpinning the data and claims on this site. All DOIs verified. Click any citation to view on the publisher's site.
Optimal battery storage operation for PV systems with tariff incentives
Pimm, A.J., Cockerill, T.T., Taylor, P.G.
Applied Energy · 2018
Foundational paper on arbitrage optimisation with dynamic tariff dispatch.
doi:10.1016/j.apenergy.2018.02.169The value of residential battery storage under different electricity pricing structures
Hoppmann, J., Volland, J., Schmidt, T.S., Hoffmann, V.H.
Energy Policy · 2014
Comparative analysis of time-of-use vs flat-rate tariffs. Key reference for ToU arbitrage economics.
doi:10.1016/j.enpol.2014.09.018Revenue and self-sufficiency optimisation for battery energy storage in Great Britain
Staffell, I., Rustomji, M.
Journal of Energy Storage · 2016
GB-specific study. Shows how arbitrage revenue varies with market conditions and battery size.
doi:10.1016/j.est.2016.06.009Forecast-based optimal scheduling of battery systems in spot markets
Bradbury, K., Pratson, L., Patiño-Echeverri, D.
Energy · 2014
Demonstrates value of price forecasting for dispatch decisions.
doi:10.1016/j.energy.2013.11.024Economic viability of battery energy storage and grid strategy: a special case of China electricity market
Gao, D.W., Muljadi, E., Bai, T., Miller, M., Wang, W.
Energies · 2017
Comparative market analysis including VPP participation. Useful for global benchmarking.
doi:10.3390/en10050702Optimal operation of battery energy storage systems considering grid dynamics
Oudalov, A., Chartouni, D., Ohler, C.
IEEE Transactions on Power Systems · 2007
Classic paper on frequency response and arbitrage revenue stacking for BESS systems.
doi:10.1109/TPWRS.2007.901459Arbitrage with storage: the impact of time-varying capacity constraints
Sioshansi, R.
IEEE Transactions on Power Systems · 2010
Models degradation-adjusted arbitrage value over battery lifetime.
doi:10.1109/TPWRS.2010.2047442Virtual Power Plants and their operational and market activities: a literature review
Pudjianto, D., Ramsay, C., Strbac, G.
IET Renewable Power Generation · 2007
Seminal VPP framework paper. Defines aggregator models used by Octopus, Kraken Flex and others.
doi:10.1049/iet-rpg:20060023Behind-the-meter battery storage: A source of flexibility for the electricity system?
Barbour, E., Wilson, I.G., Bryden, J., Turner, P., Hall, S., Johnston, P.
Energy Research & Social Science · 2016
UK-focused. Analyses behind-the-meter flexibility value. Estimates GB aggregate flexibility from residential BESS.
doi:10.1016/j.erss.2016.08.010Solar Care Club
How do I keep my battery system maintained?
The Solar Care Club offers remote monitoring from £9.99 a month and on-site inspections from £19.99, with same-day response available on the top tier — no contract, cancel any time.
Your battery is an asset — protect it. The Solar Care Club gives you monitoring, inspections, and fast response when something needs attention. Repairs are always quoted and charged separately, at member rates.
Watch
£9.99/mo
72-hour response
- Remote monitoring
- Performance alerts
- Annual generation report
Care
£19.99/mo
24-hour response
- Everything in Watch
- Annual on-site inspection
- Battery health check
- Member-rate repairs
Care Plus
£26.99/mo
Same-day response
- Everything in Care
- Priority scheduling
- Panel cleaning (ground-level pole)
- Thermal imaging check
No contract. Cancel any time.
On-site visits are currently available in the Central Belt, Dundee, Fife, and Perthshire. Elsewhere in Scotland you can join Watch today and we will tell you when we reach you. Cleaning is done from ground level with a pure-water pole — our operatives never go on your roof. Battery health monitoring and inspection included in Care tiers.
- Do you install in Scotland?
- Yes. We cover all of Scotland, from Glasgow, Edinburgh and Dundee to Aberdeenshire, the Highlands and the islands. Our office is in Dundee, and every quote follows a survey of your home.
- Can I add a battery to existing solar?
- Usually, yes. An AC-coupled battery has its own inverter and can be added to most existing solar systems without replacing the panels. The survey checks your inverter, consumer unit and grid connection so the battery suits the system you already have.
- Is finance available?
- Finance available, subject to status. Ask about it when you request your quote and we will explain the options alongside your written quote.
- How do I get a quote?
- Call 0141 230 0198 or fill in the quote form. We then arrange a survey of your home, and afterwards send you a written, no-obligation quote.
Before you decide
Know exactly what you're getting
How it works
From survey to switch-on: what happens at each stage of your installation.
Guarantees
10-year battery and inverter warranties, guaranteed workmanship and insurance-backed cover.
Insights
Plain-English guides to Agile, Intelligent and export tariffs, updated as rates change.
FAQs
Costs, planning, grid notifications, tax and battery lifespan, answered in one place.
About
Who runs Battery Arbitrage UK?
Scottish Energy Efficiency is an independent advisory business based in Dundee, covering all of Scotland — we are not an installer and do not sell hardware.
batteryarbitrage.co.uk is the only UK site dedicated to making money from a home battery rather than saving money with one. We compare VPP aggregators, automation software, and market spreads so you can decide whether arbitrage is worth it before you invest.
Scottish Energy Efficiency is an impartial advisory business. We are not an installer, and we are not MCS certified in our own right. We install through MCS-certified partners: installation is carried out by our partner, Home Heating Services (Scotland) Ltd which holds MCS certification IAA10151, TrustMark registration 3559930, and Gas Safe registration 559575.
Based in Dundee, we cover all of Scotland. Our team has over 40 years of combined experience in renewable energy and energy efficiency. We work for you, the homeowner, not for the manufacturers.
Scottish housing stock matters for battery installation. Tenement flats and close entries common in Glasgow and Edinburgh may require co-owner consent for external battery enclosures. Sandstone and granite tenements in conservation areas or listed buildings need planning permission and a building warrant (via eBuildingStandards) before installation. A no-obligation survey confirms what is possible for your property.
What does MCS certification mean?
MCS (Microgeneration Certification Scheme) is the UK quality mark for renewable installers. An MCS-certified installer has been independently assessed for technical competence. You can check the register yourself at mcscertified.com.
TrustMark is the government-backed quality mark for trades. An insurance-backed guarantee through the Independent Warranty Association covers your system if the installing company ceases trading. Both are held by Home Heating Services (Scotland) Ltd, not by Scottish Energy Efficiency.
How can you check an installer before you commit?
We install through MCS-certified partners. Our installation partner is TrustMark-registered and offers an insurance-backed guarantee, and you can verify every credential on the live public registers before you commit.
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Ready to see what a battery could do for your home?
No-obligation survey. Finance available, subject to status.