What is Battery Arbitrage? How Scottish Homeowners Earn from Batteries
Quick Answer
Battery arbitrage means buying electricity when it's cheap (typically overnight at 7-15p/kWh) and using it when it's expensive (peak rates of 24-40p/kWh). With smart tariffs like Octopus Flux or Agile, Scottish homes earn £300-500 annually from this price difference alone.
Complete guide to earning money from your home battery through smart tariff arbitrage opportunities.
Battery Arbitrage in Plain English
Battery arbitrage is the practice of buying electricity when it is cheap and using or selling it when it is expensive. With smart tariffs now available across Scotland, overnight electricity rates drop as low as 7-15p per kWh, while peak daytime and evening rates climb to 24-40p per kWh. Your home battery charges during those cheap hours and powers your home during the expensive ones.
Think of it like buying petrol at half price overnight and using it during the day when the price doubles. The battery automates this process entirely. You set it up once, and it cycles daily, pocketing the difference between off-peak and peak electricity prices without any effort from you.
Scottish homeowners on smart tariffs are earning £300-£500 per year from battery arbitrage alone -- without any solar panels. Add solar and total savings can exceed £1,500.
How Battery Arbitrage Works Step by Step
Octopus Flux, Agile, or Intelligent Go offer the best spreads
Between midnight-5am when electricity costs 7-15p/kWh
Instead of buying 28p/kWh electricity, you use your 7p stored energy
4-7pm rates hit 30-40p -- your battery can export to the grid
Automated through your battery management system, zero effort required
The Numbers: How Much Can You Actually Earn?
| Scenario | Battery Size | Daily Saving | Annual Saving |
|---|---|---|---|
| Battery only (Flux) | 9.5 kWh | £0.95-£1.40 | £350-£500 |
| Battery only (Agile) | 9.5 kWh | £1.00-£2.00 | £365-£730 |
| Solar + Battery (Flux) | 9.5 kWh | £2.50-£3.80 | £900-£1,400 |
| Solar + Battery (Agile) | 9.5 kWh | £2.80-£4.50 | £1,020-£1,640 |
| Large solar + battery | 13.5 kWh | £3.50-£5.00 | £1,275-£1,825 |
Which Battery is Best for Arbitrage?
Best value for arbitrage. Built-in inverter, excellent app for scheduling, 12-year warranty. £5,800 installed
Premium choice. 13.5kWh capacity, fastest charge/discharge, seamless automation. £8,500 installed
Strong contender. Good capacity, reliable, requires separate inverter. £5,200 + inverter
Budget entry point. 5kWh is small for arbitrage but good starter. £3,500 installed
Which Tariff Should You Choose?
Best for most people. Predictable 3-rate structure. Import at 7p overnight, export at 15p peak. Easy to automate
Best for power users. Half-hourly pricing, occasional negative rates (get paid to use electricity!). Higher ceiling but more variable
Best for EV owners. Extended cheap window, smart charging integration. Works well alongside battery arbitrage
Arbitrage earnings depend on tariff rate spreads, which can change. Current spreads are historically strong. Even if spreads narrow by 30%, arbitrage remains profitable.
Getting Started with Battery Arbitrage
Getting started is straightforward. Book a free consultation with our team and we will assess your property, recommend the right battery size, and design a system tailored to your energy usage patterns. We handle the full installation, smart tariff setup, and battery scheduling configuration so you start earning from day one.
Typical installation takes 2-4 weeks from survey to commissioning. Our MCS-certified installers work across Scotland, and we provide ongoing monitoring support to ensure your system is always optimised for maximum arbitrage returns.
Related Calculators
These figures are based on real Scottish systems we've installed.
Related Services
Frequently Asked Questions
Typical earnings are £300-500 annually from arbitrage alone. Combined with solar self-consumption, total value can exceed £1,000 per year.
Octopus Flux, Octopus Agile, and Intelligent Octopus Go are the main options. Each has different rate structures and requirements.
No. Battery arbitrage works independently of solar. However, combining both maximises overall returns.
Yes, completely. Energy suppliers design these tariffs specifically to encourage load shifting through batteries.
Arbitrage alone provides 15-25% of battery cost annually. Combined with solar, payback is typically 7-10 years.
Part of our Battery Storage guide
Everything about home battery storage, arbitrage, and smart tariffs in Scotland
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