Prices and ratings checked: August 9, 2026. Energy tariffs move often, so verify current rates for your postcode or premises before switching.

Author: Abdullah Shoaib | Energy Markets Analyst, 8+ years in the energy industry

The 60-Second Answer

For households, Octopus Energy is generally the better choice. It scores better on customer satisfaction, has a lower complaint rate in the figures used for this comparison, and offers a stronger range of smart tariffs. For businesses, ScottishPower often has the advantage because it offers longer contract terms, extended support hours, and volume discounts for higher consumption.

That does not mean one supplier is always cheaper. Business energy pricing depends heavily on consumption, standing charges, contract length and the quote available for your premises. Before switching, compare like-for-like quotes using your actual consumption.

I have spent over a decade in the UK energy market, and I have watched businesses and households pick a supplier based on brand reputation alone, then regret it six months later.

The Octopus versus ScottishPower question has a fairly clear pattern once you separate the two audiences:

Octopus tends to win for households, ScottishPower tends to win for commercial customers. But the real picture has more texture than that split suggests, so it is worth walking through properly.

For households, Octopus leads on customer satisfaction (4.8/5 on Trustpilot, nine years as a Which? Recommended provider), has a lower complaint rate (495 versus 1,499 per 100k accounts), and offers smart tariffs that are genuinely useful if you have an EV or a heat pump.

For businesses, ScottishPower’s longer contract terms (1 to 3 years), extended support hours (8am to 10pm), tangible renewable generation assets (2,800 MW), and volume discounts (5 to 10% for over 100k kWh) often make it the more practical choice, even though its household service scores are weaker.

This comparison lays out both sides with the actual market data behind them, so you can decide based on whether you are buying as a household or as a business.

Quick Verdict: Octopus vs ScottishPower

The market reality

For households, Octopus is the stronger choice. It is cheaper on average, scores significantly better on customer satisfaction (4.8/5 versus 4.3/5), has the lowest complaint rate in the sector, and has held Which? Recommended Provider status for nine years running.

For businesses, ScottishPower is often the better fit. Longer contract terms of 1 to 3 years, support hours that stretch to 10pm, real renewable generation capacity of 2,800 MW, and discounts of 5 to 10% for high consumption businesses all work in its favour.

Choose Octopus if you are a household that wants low bills, strong service, and smart tariffs, or a business that wants time of use tariffs like Agile or Tracker and a supplier with a proven service record.

Choose ScottishPower if you are a commercial customer who values contract flexibility, longer support hours, genuine renewable infrastructure to point to in ESG reporting, or volume discounts once your consumption passes 100k kWh.

Who Are Octopus Energy and ScottishPower?

Octopus Energy was founded in 2015 and is now the largest supplier in the UK, holding 25.7% of the electricity market and 25.9% of gas. It built its reputation on smart tariffs such as Agile and Intelligent Go, an app led approach to account management, and 100% renewable backed electricity sourced through more than 700 UK PPA generators.

It has been named a Which? Recommended Provider for nine consecutive years, carries a 4.8/5 Trustpilot rating from over 830,000 reviews, and has the lowest complaint rate in the sector at 495 to 561 per 100,000 accounts.

Best for: households that want lower bills, better service, and smart technology. It also suits businesses with flexible consumption patterns that want time of use pricing.

ScottishPower was founded in 1991 and has been owned by Spain’s Iberdrola Group since 1999. It runs a substantial renewable generation arm, ScottishPower Renewables, separate from its retail supply business, with 2,800 MW across 40 wind farms.

In July 2026 it announced a £1.5bn upgrade to Whitelee Wind Farm, the UK’s largest onshore site, which will double capacity from 539 MW to 1 GW by 2035.

Its business tariffs include 1 to 3 year fixed contracts, variable tariffs with no exit fees, and 100% renewable electricity from the grid mix, supplemented by REGOs.

Best for: commercial customers who want longer contracts, extended support hours, real renewable infrastructure behind their supply, and discounts at higher consumption levels.

Household Comparison: Why Octopus Wins

Pricing (Households)

Octopus household rates: around £1,792/year on the Flexible variable tariff, around £1,841/year on the 12 month fixed.

ScottishPower household rates: around £1,805/year on the Standard Variable tariff, around £1,990/year on the Help Beat Cancer fixed deal.

Verdict: Octopus comes out £13 to £149 a year cheaper on average for households. That gap will not change your life, but over a two or three year period it adds up, and it is one of several reasons Octopus tends to win the household comparison rather than the only one.

Customer Satisfaction (Households)

Octopus:

• 4.8/5 on Trustpilot from over 830,000 reviews, with 90% at five stars
• Which? Recommended Provider for nine consecutive years, scoring 4/5 stars across every category
• 495 to 561 complaints per 100,000 accounts, the lowest in the sector

ScottishPower:

• 4.3 to 4.4/5 on Trustpilot from 150,000 to 200,000 reviews, with 60% at five stars
• Ranked worst for customer service in the Which? 2026 survey, at 2/5 stars across every category
• 1,499 complaints per 100,000 accounts, nearly three times the Octopus figure

Verdict: on every independent measure I have looked at, Octopus comes out ahead for household service. This is not a marginal difference.

A complaint rate three times higher tells you something about how a company handles things when a bill goes wrong or a meter reading gets disputed, and that matters more than the headline price once something actually needs fixing.

Smart Tariffs (Households)

Octopus offers Agile, Tracker, Intelligent Go, Cosy, and Flux, a genuinely strong lineup of time of use tariffs for anyone with an EV, a heat pump, or solar panels.

ScottishPower offers EV Saver, EV Optimise, and Power Saver, which are workable but less sophisticated than what Octopus has built.

Verdict: if smart technology and time of use pricing matter to you, Octopus is the clear winner for households.

Household Verdict: Octopus Is Better

For households, Octopus is the clear winner:

• Cheaper on average, by £13 to £149 a year
• Significantly better customer satisfaction, 4.8/5 versus 4.3/5 on Trustpilot
• The lowest complaint rate in the sector, 495 versus 1,499 per 100k
• Nine years as a Which? Recommended Provider against ScottishPower’s worst ranking in 2026
• Stronger smart tariffs for EVs, heat pumps, and solar

Business Comparison: Why ScottishPower Often Wins

Pricing (Business)

Octopus Business rates: 16.8 to 22.5p/kWh for electricity, with standing charges of 35 to 70p a day.

ScottishPower Business rates: 15.2 to 24.2p/kWh for electricity, with standing charges of 30.82 to 90.2p a day, plus discounts of 5 to 10% once consumption passes 100k kWh.

Verdict: this one is genuinely a tie, and it comes down to your consumption profile. I have seen businesses assume the cheaper looking headline rate wins, then find that ScottishPower’s volume discount changes the maths entirely once they are past 100k kWh a year.

If you are close to that threshold, get quotes from both and run the actual numbers rather than comparing rate cards.

Contract Flexibility (Business)

Octopus Business: fixed contracts of 12 to 24 months, or a flexible option with no fixed term.

ScottishPower Business: fixed contracts of 1 to 3 years, variable tariffs with no exit fees, and deemed tariffs for new premises.

Verdict: ScottishPower wins here on sheer range. More contract lengths, a no exit fee variable option, and deemed rates for a new site all give a business owner more room to match a contract to how their lease or budget cycle actually works.

A three year fixed term is not right for everyone, but for a business that wants price certainty through a full lease term, Octopus simply does not offer it.

Business Support (Commercial)

Octopus Business: standard business hours, an app first approach, and limited phone support.

ScottishPower Business: Monday to Friday from 8am to 10pm, a 24 hour energy saving helpline, Carbon Trust efficiency advice, and a UK based team.

Verdict: ScottishPower wins clearly here. The real issue is usually not day to day service, it is what happens when something goes wrong outside normal office hours.

A metering fault or a billing dispute at 7pm on a Tuesday is a different problem for a business with a shop or a site to run than it is for someone checking an app from their sofa. Extended hours matter more to commercial customers than most comparisons give them credit for.

Renewable Generation (Business ESG)

Octopus Business: REGO backed 100% renewable electricity through more than 700 UK PPA generators.

ScottishPower Business: 100% renewable from the grid mix plus REGOs, backed by ownership of 2,800 MW of wind capacity, the largest UK onshore wind generator, with a £1.5bn upgrade underway at Whitelee.

Verdict: ScottishPower wins for businesses with ESG commitments to report on. The physical electricity is identical either way, but if you need to point to something concrete in a sustainability report or a B Corp assessment, owned generation assets carry more weight with auditors and stakeholders than a portfolio of purchase agreements, even though both routes deliver REGO backed renewable supply.

Business Verdict: ScottishPower Is Often Better

For commercial customers, ScottishPower is often the stronger choice:

• Longer contract terms, 1 to 3 years against 12 to 24 months, which suits businesses aligning energy costs to a lease or a budget cycle
• Extended support hours, 8am to 10pm, which matters when something needs fixing outside a normal working day
• Volume discounts of 5 to 10% above 100k kWh, which can undercut Octopus for larger SMEs
• Tangible renewable assets, 2,800 MW and the Whitelee upgrade, which carry more weight in ESG reporting
• Variable tariffs with no exit fees, giving more flexibility than Octopus’s flexible contract

Exception: Octopus Business can still be the better call for a smaller SME that wants smart tariffs like Agile or Tracker for an EV fleet, or that would rather manage the account through an app than pick up the phone.

Ofgem Enforcement: Important Context

Octopus Energy:

• A £1.5m redress payment in July 2025, specifically for failing to send final closing bills to 34,000 domestic prepayment customers within six weeks of switching, covering the period 2016 to 2023
• This was not a business related enforcement action. It concerned Octopus’s domestic prepayment billing, and business customers have not reported the same pattern of issues

ScottishPower:

• An £18m fine in 2016 for a backlog of more than 75,000 overdue bills and failings in complaint handling
• A Provisional Order in 2022 for vulnerable customer care failings, one of 17 suppliers flagged by Ofgem that year
• Part of a £74m compensation scheme in 2025 for 40,000 customers forcibly switched to prepayment meters without proper assessment

Verdict: both suppliers carry Ofgem enforcement history, and it is worth reading past the headline numbers. Octopus’s issue was specific and domestic, tied to prepayment billing.

ScottishPower’s history is broader, spanning billing backlogs, vulnerable customer care, and forced prepayment switching.

Neither history should be a dealbreaker on its own, but a business customer with vulnerable staff or customers on site might reasonably weigh ScottishPower’s vulnerable care record more heavily than a household would.

Renewable Generation: The Reality

Octopus: more than 700 UK PPA generators, £6bn in assets, REGO backed 100% renewable supply.

ScottishPower: 2,800 MW across 40 wind farms, a £1.5bn Whitelee upgrade underway, 100% renewable from the grid mix plus REGOs.

Here is the part most comparisons gloss over. Both suppliers draw electricity from the same national grid, so the physical power reaching your premises is identical whichever one you choose. The real difference is in generation ownership.

ScottishPower owns considerably more direct wind capacity, 2,800 MW against Octopus’s network of over 700 purchase agreement generators, and that distinction can matter for businesses with ESG targets or B Corp ambitions that want to point to tangible infrastructure investment rather than a contractual arrangement.

For households, this distinction rarely matters. Octopus’s 100% renewable backed supply is enough for almost everyone, and few households need to dig into the difference between owned assets and PPA generators.

For businesses, ScottishPower’s tangible investment, including the £1.5bn Whitelee upgrade and the 2,800 MW portfolio, tends to carry more credibility in sustainability reporting, even though both suppliers rely on REGOs for the actual supply.

Which Should You Choose? Household vs. Commercial

For Households: Choose Octopus

Octopus is the better choice for households because:

• It is cheaper on average, by £13 to £149 a year
• It scores significantly better on customer satisfaction, with a 4.8/5 Trustpilot rating and nine years as a Which? Recommended Provider
• It has the lowest complaint rate in the sector, 495 against 1,499 per 100k
• Its smart tariffs are stronger for EVs, heat pumps, and solar
• Its app led account management suits most households

Choose ScottishPower for a household only if a specific fixed deal in your postcode genuinely beats Octopus’s price, you strongly prefer phone support to an app, or you are already a satisfied customer and do not want the hassle of switching.

For Businesses: Choose ScottishPower (Often)

ScottishPower is often the better choice for businesses because:

• Its contract terms run 1 to 3 years, better suited to lease and budget cycles than Octopus’s 12 to 24 months
• Its support hours run 8am to 10pm, which matters when something needs fixing outside standard hours
• Its volume discounts of 5 to 10% above 100k kWh can make it cheaper for larger SMEs
• Its owned renewable generation, 2,800 MW and the Whitelee upgrade, carries more weight in ESG reporting
• Its variable tariffs come with no exit fees, adding more flexibility

Choose Octopus Business if you are a smaller SME that wants smart tariffs like Agile or Tracker for an EV fleet or flexible consumption, you would rather manage things through an app than by phone, your consumption sits below the 100k kWh threshold where ScottishPower’s discounts kick in, or customer satisfaction matters more to you than contract length and support hours.

Frequently Asked Questions

Is Octopus Energy cheaper than ScottishPower? 

For households, yes on average, by £13 to £149 a year. For businesses, it depends on consumption. ScottishPower’s 5 to 10% discount above 100k kWh can make it cheaper for larger SMEs.

Which has better customer service? 

Octopus, with a 4.8/5 Trustpilot rating from over 830,000 reviews, nine years as a Which? Recommended Provider, and the lowest complaint rate in the sector at 495 to 561 per 100k. ScottishPower was ranked worst for customer service in the Which? 2026 survey, at 2/5 stars, with 1,499 complaints per 100k.

Is Octopus better for households? 

Yes. It is cheaper, scores higher on satisfaction, has fewer complaints, and offers better smart tariffs.

Is ScottishPower better for businesses? 

Often, yes. Longer contracts of 1 to 3 years, support hours to 10pm, volume discounts of 5 to 10% above 100k kWh, and 2,800 MW of owned renewable generation for ESG reporting.

Does Octopus work with businesses? 

Yes. Octopus Business serves SMEs with fixed contracts of 12 to 24 months or a flexible option, smart tariffs like Agile and Tracker, and REGO backed 100% renewable supply.

Which is greener? 

Both supply 100% renewable electricity through REGOs from the same national grid mix. ScottishPower owns more direct generation capacity, 2,800 MW against Octopus’s network of over 700 PPA generators, which can matter for businesses reporting against ESG targets.

What was Octopus’s £1.5m Ofgem redress for? 

Failing to send final closing bills to 34,000 domestic prepayment customers within six weeks, covering 2016 to 2023. It was not related to business billing.

What is ScottishPower’s Ofgem enforcement history? 

An £18m fine in 2016 for billing backlogs, a 2022 Provisional Order for vulnerable customer care, and part of a £74m forced prepayment compensation scheme in 2025.

Final Verdict: Households → Octopus, Businesses → ScottishPower

For households, Octopus Energy is the clear winner. It is cheaper on average, scores significantly higher on customer satisfaction with a 4.8/5 Trustpilot rating and nine years as a Which? Recommended Provider, has the lowest complaint rate in the sector, and offers better smart tariffs for EVs, heat pumps, and solar.

For businesses, ScottishPower is often the stronger choice. Longer contract terms of 1 to 3 years, support hours running to 10pm, volume discounts of 5 to 10% above 100k kWh, and owned renewable generation assets worth 2,800 MW, including the Whitelee upgrade, all work in its favour for ESG reporting.

Exception: Octopus Business can still suit a smaller SME that wants smart tariffs like Agile or Tracker for an EV fleet or flexible consumption, or one that weighs customer satisfaction more heavily than contract length and support hours.

Before you decide, get quotes from both suppliers for your specific premises or postcode, your consumption profile, and your priorities. For households, Octopus is generally the better call. For businesses, ScottishPower often wins, but the only way to know for certain is to check pricing against your actual consumption.