Battery Arbitrage
Scotland

What is Battery Arbitrage?

Battery arbitrage is the practice of buying electricity at low prices (typically using a half-hourly Agile tariff), storing it in a home battery, and using or exporting it during higher-price periods. The profit is the spread between purchase and use/export price, minus round-trip efficiency losses (typically 5–10%).

The Numbers

  • • Scotland Agile typical spread: 20–30p/kWh
  • • Overnight cheap: 5–8p/kWh
  • • Evening peak: 25–35p/kWh
  • • 10kWh battery income: £400–£700/year

How It Works

  1. 1. Charge battery overnight (cheap)
  2. 2. Store electricity in battery
  3. 3. Discharge during peak (expensive)
  4. 4. Profit = spread × capacity × efficiency

Why Scotland is Perfect for Arbitrage

Scotland's Octopus Agile region H has the UK's highest price volatility. This is due to Scotland's abundant wind power generation creating periods of very cheap electricity (when wind is high and demand is low), followed by expensive peak periods when renewable generation drops and demand surges.

Real Example: A Winter Day

02:00–04:00 (Charge window)
Import: 6.2p/kWh × 10kWh = £0.62 cost
17:00–19:00 (Discharge window)
Export or use: 32.5p/kWh × 10kWh × 90% = £2.93 value
Daily profit
£2.31 per cycle
× 250 viable days/year = ~£577/year

Compatible Batteries

Not all batteries can arbitrage effectively. You need a system with:

  • Hybrid inverter (AC or DC coupled)
  • Programmable charge/discharge schedules
  • Good round-trip efficiency (90%+)
  • Ideally: VPP support or Agile automation

Best options: Duracell Dura5, GivEnergy AIO, Tesla Powerwall 3. All installed by Scottish Energy Efficiency with full automation support.

Battery Arbitrage vs Solar

Battery arbitrage works alongside solar, not instead of it. The two strategies complement each other:

  • Summer: Solar self-consumption prioritised. Less arbitrage (smaller spreads).
  • Winter: Maximum arbitrage (larger spreads). Solar contribution lower.

If you have solar already, add battery storage to your existing solar panels to unlock arbitrage income.

Is It Legal?

Yes. Battery arbitrage is completely legal in the UK. Octopus Energy actively encourages it through their Agile and Intelligent tariffs. Some tariffs (like Intelligent Flux) even provide free charging periods specifically for battery arbitrage.

Getting Started

Three steps to start earning from battery arbitrage in Scotland:

  1. 1. Install a compatible battery (check compatibility)
  2. 2. Switch to Octopus Agile or Intelligent Flux (compare tariffs)
  3. 3. Set up automation or manual schedules (automation guide)

Start Your Arbitrage Journey

MCS-certified battery installation in Scotland. 0% VAT. Free survey and arbitrage assessment.

Book Free Survey — 0141 230 0198