Octopus Energy vs Scottish Power

Scottish Power's EV and heat-pump offers make this more than a standard-rate comparison. The useful question is which tariff or add-on fits your home. Compare the exact setup with both suppliers rather than assuming one has the better route for every household.

That matters because Scottish Power is now offering two quite different EV paths. EV Saver is the simpler one, a classic time-of-use tariff with an overnight off-peak window. EV Optimise is the more interesting one. It is not a cheap-rate tariff in the usual sense. You stay on a normal Scottish Power tariff, smart charging is scheduled through the app and the difference between your standard unit rate and the advertised smart-charging rate is credited back later on your bill.

The latest support wording makes that credit model worth spelling out. EV Optimise works only for home charging and sits outside Scottish Power time-of-use tariffs such as EV Saver, Heat Saver and Solar Saver. The eligibility route now points to a single-rate meter, half-hourly smart-meter readings, credit payment, a compatible connected car and a home charger. Scottish Power also says smart charging will not happen during the 4pm to 8pm peak period. Those details do not make the product poor, but they do mean the cheapest-looking number is only part of the decision.

Pricing

For a standard or fixed tariff, compare both suppliers' current postcode quotes using the same annual electricity and gas consumption. Include standing charges, payment method, the fixed term and any exit fees. A lower EV charging rate does not tell you which quote costs less for the whole home.

If you plan to add an EV, heat pump, solar panels or a battery later, check the relevant product's eligibility separately. Today's quote does not guarantee access to a future smart tariff or export arrangement. Compare the setup you have now before counting a possible future benefit.

Scottish Power's EV offers are not all the same product

This is the part most likely to trip people up. Scottish Power now has two genuinely different EV models, so the first useful question is which product shape you are actually comparing before you look at the headline pence-per-kWh number.

Scottish Power says VAT is calculated on the original electricity charge before the EV Optimise credit is applied. Compare the electricity charge and the EV credit together, rather than reading the normal unit rate as the final cost of eligible smart charging.

When should the credit appear? Scottish Power's EV Optimise billing guide says credits for the previous month's smart charging are applied in the first week of each month and appear on the next generated bill. The credit builds up in your account balance; it does not automatically reduce your Direct Debit. Compare the app's session history with the credit on that bill before treating it as missing. If the expected credit has not arrived, ask Scottish Power to check the relevant sessions and billing period rather than assuming you need to change tariff.

Check the charger bundle as a one-year offer

Scottish Power's current EV Charger Bundle links a promotional EV Optimise rate to buying an eligible home charger. The current offer says to check EV Optimise eligibility before buying, onboard within 30 days of installation and use the promotional rate for one year. The offer is scheduled to close at 11.59pm on 3 December 2026. Treat that date and the live terms as part of the quote, not as an evergreen tariff promise.

The bundle does not change the underlying bill mechanics. Electricity is still charged at the normal home rate first, with eligible EV smart charging credited later. Scottish Power's July onboarding update added fresher vehicle-data checks, a clearer setup timeline, a successful-connection screen and more guidance around preferences. Those changes should make setup easier to follow, but they do not widen eligibility or turn EV Optimise into a whole-home cheap-rate tariff.

Eligibility and trust are the real caveats

Scottish Power's eligibility notes make EV Optimise less universal than the headline suggests. The current rules point towards a live Scottish Power electricity account, a communicating smart meter sharing half-hourly readings, a single-rate tariff and meter rather than Economy 7, credit payment, a compatible car with a working internet connection and a home charger. Scottish Power also lists some car brands as beta-phase compatible, which is useful but worth treating as a support-risk check rather than a promise that every vehicle will behave identically. It is also not available on Scottish Power's own time-of-use tariffs such as EV Saver, Solar Saver and Heat Saver.

Scottish Power says EV Optimise can work with solar panels or home batteries, but its algorithm does not currently account for self-generated or stored electricity when calculating smart-charging schedules and credits. More equipment does not automatically make either supplier the better choice. Check how your car, charger and battery controls interact, whether the import and export tariffs can be paired and how eligible charging is measured before counting the benefit.

The other caveat is trust and support. Scottish Power's Trustpilot score now looks healthier than many people expect, sitting around 4.3 with a very large review base. Yet Which?'s January 2026 customer survey still placed it at the bottom of the table with poor scores across service measures. That mismatch does not prove one source is wrong, but it is a reminder that a decent public review profile does not automatically mean a smoother experience once billing or meter data gets messy.

Green and heating credentials

Scottish Power still has a genuine renewables story through Iberdrola and its own UK wind generation. This page should not pretend otherwise. If you mainly care about backing a large supplier with a serious generation portfolio, Scottish Power has a credible answer.

Compare the two suppliers on the routines you can actually use. An EV tariff, a heat-pump tariff and an export arrangement can have different meter, device and tariff-pairing conditions. A supplier offering all three does not mean every combination is available on your account or that it will cost less.

The heat-pump comparison is a good example. Scottish Power Heat Pump Saver currently offers a daytime off-peak window between 11am and 4pm and says that cheaper window applies to all household electricity use, not only the heat pump. That may suit homes that can heat water, pre-warm rooms or run appliances in the middle of the day. Cosy Octopus is a different shape, with multiple cheaper periods and a more obvious late-evening slot, so the better choice depends on the rhythm of the home rather than the headline rate alone.

Where Scottish Power has genuine strengths

A plausible EV option for the right driver. This is not just a dusty big-supplier page any more. EV Saver and EV Optimise both give Scottish Power a real place in the EV comparison rather than a token presence.

Mainstream familiarity with a stronger public review profile than its reputation suggests. Plenty of households still want a large established supplier, and Scottish Power's current Trustpilot picture is better than the usual stereotype.

Serious renewable generation backing. If supplier ownership of actual renewable assets matters to you, Scottish Power can make a respectable case.

The verdict

Scottish Power may suit your home if EV Saver's overnight window or EV Optimise's eligible charging credits work with your routine and the full quote compares well. For heat-pump homes, compare Heat Pump Saver's 11am to 4pm window with when you need heating and hot water. Include the electricity used outside the cheaper period, not just the discounted rate.

Compare Octopus if its live tariff and eligibility suit your home. Go offers a fixed overnight window, Intelligent Go adds supported managed charging and Cosy provides several cheaper periods for electric heating. Check both suppliers against the same annual usage, standing charges and exit fees, then confirm your exact meter, car or charger and import/export pairing. The number of devices in your home is not, on its own, a reason to switch.

Octopus Energy rates update automatically. Other supplier rates and public charging costs were correct as of October 2026 and may have changed.