Battery savings calculator — Southern Scotland
Pick your battery size, your usage and your tariff — we calculate today's daily benefit using the live Flux import-vs-export spread (and Agile equivalents) for the SP Energy Networks region. No assumed national averages, no stale annual figures from a brochure.
Built for homes in Stirling, Falkirk, Bridge of Allan, Dunblane, Dollar and the wider Central Belt.
Battery savings · Southern Scotland
What would a battery actually save you today?
Roughly how big is the battery you're thinking about?
Common Scottish residential sizes: 5kWh single Powerwall module, 10kWh GivEnergy or Powerwall 3 entry, 15kWh+ for heavy users.
Live data for Southern Scotland · refreshed hourly from the Octopus public API
Today's spread, not last year's
Flux and Agile rates move. This calculator uses what your battery would actually earn on today's SP Energy Networks prices.
Built for your region
Southern Scotland's electricity prices on Flux differ slightly from English regions — and the export peak window (16:00–19:00) tracks Scotland's evening demand pattern. This calculator reflects that.
Install ready
Mackie are Tesla Certified and GivEnergy Certified installers fitting AC-coupled retrofit and hybrid inverter systems across Central Scotland.
Today's live Octopus rates for Southern Scotland
Full breakdown of every tariff that matters for a battery — Flux import, Flux export, Outgoing Octopus and the half-hourly Agile window. Updated every hour.
Octopus Flux — import
Buy from the grid. Charge in the cheap window, avoid the peak.
| Time band (UK) | Window | Rate |
|---|---|---|
| Cheap window | 02:00–05:00 | 14.98p/kWh |
| Standard | 05:00–16:00 | 24.96p/kWh |
| Peak window | 16:00–19:00 | 34.94p/kWh |
| Standard | 19:00–02:00 | 24.96p/kWh |
| Standing charge | Daily | 62.83p/day |
Octopus Flux — export
Sell to the grid. Peak export pays nearly 3× the standard rate.
| Time band (UK) | Window | Rate |
|---|---|---|
| Low window | 02:00–05:00 | 4.42p/kWh |
| Standard | 05:00–16:00 | 9.55p/kWh |
| Peak export | 16:00–19:00 | 27.19p/kWh |
| Standard | 19:00–02:00 | 9.55p/kWh |
Outgoing Octopus — flat export
Simple flat-rate SEG. Used as a baseline against Flux and Agile Outgoing.
| Time band (UK) | Window | Rate |
|---|---|---|
| Flat rate | 00:00–24:00 | 12.00p/kWh |
Octopus Go — EV import
Five-hour cheap overnight window for EV charging, flat day rate.
| Time band (UK) | Window | Rate |
|---|---|---|
| Cheap window | 00:30–05:30 | 9.50p/kWh |
| Peak window | 05:30–00:30 | 32.15p/kWh |
| Standing charge | Daily | 62.83p/day |
Intelligent Octopus Go — EV import
Smart-charged variant with a core overnight cheap window and possible extra smart slots.
| Time band (UK) | Window | Rate |
|---|---|---|
| Peak window | 05:30–23:30 | 32.15p/kWh |
| Cheap window | 23:30–05:30 | 8.00p/kWh |
| Standing charge | Daily | 62.83p/day |
Octopus Agile — half-hourly
Live · Southern ScotlandPrices change every 30 minutes. Tomorrow's slots publish around 16:00 UK.
Last refreshed: 15 May 2026, 14:40. Live data straight from Octopus Energy. Always confirm in your Octopus app before switching tariffs.
On the other side of Scotland?
Battery savings · Northern Scotland
Same calculator, different DNO rates.
Drive an EV?
EV charging cost calculator
Today's Go, Intelligent Go and Agile rates for Southern Scotland.
Frequently asked questions
How does this calculator work out today's battery benefit?
It does two things. First, it works out what you'd save by charging the battery in the cheap window (~02:00–05:00 on Flux) and discharging when you'd otherwise import at the standard rate — multiplied by today's actual spread and a 90% round-trip efficiency loss. Second, if you have solar, it adds the benefit of shifting daytime solar export into the Flux peak window (16:00–19:00), which today pays nearly 3× the flat Outgoing rate.
What size battery makes sense for a home in Stirling or Falkirk?
For most three- and four-bed homes in the Central Belt, 10 kWh is the sweet spot — big enough to cover the 16:00–19:00 peak window in full and shift a meaningful chunk of overnight load, but not so big that you're over-paying for capacity you can't fill in a Scottish winter. Heavy users (EV, electric heating, hot tub) often go to 15–20 kWh; small flats often stop at 5 kWh.
Is Octopus Flux still the right tariff for batteries in 2026?
For most solar + battery homes in the Central Belt, yes. Flux's banded structure makes it easy to schedule the battery — charge cheap overnight, discharge during the 16:00–19:00 peak. Intelligent Octopus Flux extends this with smart optimisation if you've got compatible hardware. Agile + Agile Outgoing can beat Flux for sophisticated users who actively schedule against half-hourly prices, but it's harder to set-and-forget. Both are available on the same battery hardware.
Does Mackie install batteries across Southern Scotland?
Yes — our in-house team is Tesla Certified, GivEnergy Certified and MCS Certified, fitting AC-coupled retrofit batteries onto existing solar systems and hybrid inverter new-builds. We cover Stirling, Falkirk, Bridge of Allan, Dunblane, Dollar, Bearsden, Bannockburn, Helensburgh, Alloa and the surrounding areas. We handle DNO notification, scheduling configuration and tariff setup as part of the install.
What about VAT on batteries?
Battery storage installations qualify for 0% VAT in Scotland under the energy-saving materials zero rate until 31 March 2027. That applies whether the battery is installed alongside solar or as a standalone retrofit. We'll confirm eligibility and apply the 0% rate at quote stage.
Thinking about a battery in Southern Scotland?
Mackie's in-house team installs Tesla Powerwall, GivEnergy, Fox ESS and Puredrive systems — AC-coupled retrofit on existing solar or hybrid inverter for new builds.