Scottish Power Review UK 2026: Tariffs, Iberdrola Parent, Customer Complaints

Last reviewed: 17 May 2026 | Chandraketu Tripathi, finance editor

Suppliers · Scottish Power

Scottish Power is the UK retail brand of Iberdrola SA, the Spanish multinational utility group, and one of the larger domestic gas and electricity suppliers in Great Britain. The Glasgow-headquartered business holds an Ofgem licence in the name of Scottish Power Energy Retail Limited and supplies around 3.5 million UK retail customer accounts. A sister business, Scottish Power Renewables, operates one of the UK's largest onshore-wind portfolios, and the wider group invests in offshore-wind, transmission and electric-vehicle infrastructure. This review covers the tariff range visible to UK customers in 2026, the supplier's published complaints record and Citizens Advice star rating context, how the switching process behaves in practice, the company's approach to the Ofgem default tariff cap and standing charges, the renewable-electricity claim, and the regulatory and ownership structure. Live unit prices are described structurally rather than quoted: the default tariff cap is recalculated every three months by Ofgem and any pence-per-kWh number printed in editorial would be out of date within weeks.

Tariffs available on the Scottish Power in 2026

Scottish Power maintains a relatively compact named tariff range. The product families visible on the supplier's published tariff schedule in 2026 are:

Standard Variable. The default variable tariff. Unit rates and standing charges on the Standard Variable product track the Ofgem default tariff cap, which is recalculated for each quarterly cap period. Customers who do nothing at the end of a fixed contract drop onto Standard Variable. The product is dual-fuel capable, available on credit meters and prepayment meters, and unit rates differ by Ofgem regional distribution zone.

Online Fixed. A fixed-term product where the customer manages the account through the Scottish Power app and online portal rather than through phone-based customer service. Online Fixed products have historically been offered in 12-month and occasionally 24-month versions, with pricing set independently of the Ofgem cap for the duration of the fixed term.

Help Beat the Cap. Where this product is currently offered, it is a cap-tracking variable tariff priced at a published discount versus the Ofgem default tariff cap unit rate or standing charge. The product has appeared and reappeared in the Scottish Power range as wholesale market conditions allow; check the supplier's current tariff schedule for whether the product is open to new customers at the time of switching.

Smart EV. A smart-meter and electric-vehicle bundle. The product offers a cheaper off-peak unit rate across a defined overnight window and a higher peak rate during the day. Eligibility requires a working SMETS2 smart meter operating in half-hourly settlement mode and is restricted to customers with an EV or a qualifying flexible-load device in some windows.

This review does not quote specific unit prices. The Ofgem default tariff cap is recalculated each quarter and fixed-tariff pricing is refreshed independently; the customer-specific tariff information label that Scottish Power is required to issue under the Retail Energy Code is the authoritative current figure for any individual customer's quoted unit rate and standing charge.

Customer service track record

Three independent datasets are useful for assessing a UK supplier's customer service performance, and all three publish on a quarterly cycle.

Ofgem complaints per 100,000 customers. Ofgem publishes a quarterly bulletin showing the number of complaints received by each licensed supplier, normalised per 100,000 customer accounts. Scottish Power's published complaints rate has placed the supplier above the supplier average in some recent quarters and closer to the average in others, with quarter-to-quarter fluctuation. Periods of higher complaint volume have typically coincided with billing system migration and smart-meter installation friction. The current quarterly figure for Scottish Power should be checked directly in the most recent Ofgem complaints data publication at ofgem.gov.uk.

Citizens Advice quarterly star rating. Citizens Advice publishes a supplier comparison table each quarter, scoring suppliers across five weighted service dimensions including complaints handling, ease of contact, accuracy of bills, customer guarantees and customer service ratings. Scottish Power has historically sat mid-pack in the table, with movement quarter to quarter. Readers should consult the latest Citizens Advice supplier table at citizensadvice.org.uk for the current published star score.

Energy Ombudsman case volume. Where a complaint cannot be resolved by the supplier within eight weeks, or where the supplier issues a deadlock letter sooner, the case can escalate to the Energy Ombudsman, the redress scheme approved by Ofgem under section 47A of the Electricity Act 1989. The Ombudsman publishes aggregate annual statistics on case volume by supplier and the proportion of cases upheld in the consumer's favour. Scottish Power case volumes broadly track the supplier's customer base scale, with periodic spikes during billing system change windows.

The recurring categories of published complaint for Scottish Power, as for most large suppliers, are billing accuracy, final-bill timing on switch-out, and smart-meter installation and connectivity. These are factual observations from published data and not editorial judgement: every large UK supplier shows a similar shape of complaint distribution, and the relevant comparison is the rate normalised per 100,000 customers.

Switching process specifics

UK domestic energy switches in 2026 operate under the Faster Switching programme delivered through the Retail Energy Code Company, with a target switch completion of five working days from the date the gaining supplier confirms the request. A 14-day cooling-off window runs in parallel, during which the customer can cancel the switch under the Consumer Contracts Regulations 2013.

For Scottish Power as the gaining supplier, the practical timeline is: switch request submitted, gaining-supplier confirmation issued by Scottish Power within one to two working days, the 14-day cooling-off window runs in parallel, and the supply takeover takes effect on the date confirmed in the welcome pack. The losing supplier is required to issue a final bill within six weeks of supply takeover under Ofgem Standard Licence Condition 31E.

Smart meter handover is one of the friction points where the customer experience can diverge by meter generation. SMETS1 meters installed under earlier supplier contracts can drop into dumb mode temporarily after a switch, taking manual reads until the meter is migrated onto the central Data Communications Company network. SMETS2 meters communicate via the DCC from installation and the switch is invisible to the meter. Scottish Power, like all major suppliers, operates a SMETS1 to SMETS2 migration programme run through DCC scheduling.

Final billing on switch-out from Scottish Power is required within six weeks under Ofgem rules. Delayed final bills are a recurring complaint category in published Energy Ombudsman data and the eight-week supplier-resolution window applies before a case can be escalated.

Price cap protection and standing charge approach

The Ofgem default tariff cap, introduced under the Domestic Gas and Electricity (Tariff Cap) Act 2018, sets a maximum unit rate and standing charge that licensed suppliers may charge customers on a default or standard variable tariff. The cap is recalculated each quarter using a wholesale-cost methodology Ofgem publishes openly. Customers on a fixed-term tariff are not protected by the cap and pay the contracted unit rate and standing charge for the duration of the fixed term.

Scottish Power's Standard Variable tariff is priced at or close to the cap unit rates and standing charges for the relevant Ofgem regional distribution zone. Standing charges differ by region, reflecting the different network distribution costs Ofgem allows for each of the 14 distribution zones. The supplier's published tariff information label, which Ofgem requires to be issued to each customer, sets out the customer-specific unit rate and standing charge in pence per kWh and pence per day.

Where Scottish Power offers a Help Beat the Cap product, the pricing is structured as a discount versus the cap unit rate or the cap standing charge, with the discount specified in the product terms. The discount value changes when the product is refreshed.

Standing charges in the Ofgem default tariff cap have risen materially since 2022, reflecting the cost of supplier-of-last-resort exercises (where customers of failed suppliers are absorbed by surviving suppliers under Ofgem direction) and the recovery of network and policy costs. Scottish Power, like all suppliers operating on the cap, applies the standing charge per day regardless of consumption. Ofgem has consulted publicly on alternative standing-charge structures including a zero-standing-charge tariff option.

Green credentials

Scottish Power is the only major UK retail supplier whose sister business is a domestic generator at scale. Scottish Power Renewables operates one of the largest onshore-wind portfolios in the UK, with assets in Scotland, Wales and the north of England, plus offshore-wind projects including East Anglia ONE. The wider Iberdrola Group also operates substantial renewable generation across Spain, the United States and Brazil.

For UK retail customers, Scottish Power markets 100 percent green electricity backed by the group's own generation portfolio and by Renewable Energy Guarantees of Origin (REGO) certificates where the physical match is not direct. The supplier's annual Fuel Mix Disclosure, published under the Electricity (Fuel Mix Disclosure) Regulations 2005, is the authoritative document for assessing the percentage breakdown of supplier-procured generation by fuel source. Readers comparing renewable claims across suppliers should consult the Fuel Mix Disclosure rather than rely on marketing materials alone, because Ofgem's definition of a renewable claim is precisely linked to the REGO mechanism.

Scottish Power does not currently hold B Corp certification at the UK retail entity level. The Iberdrola Group publishes a sustainability reporting cycle aligned with the Task Force on Climate-related Financial Disclosures (TCFD) and other frameworks. The group has publicly committed to large-scale renewable investment in the UK, including offshore-wind, onshore-wind and electricity transmission infrastructure through SP Energy Networks, the regulated network business that is structurally separate from the retail supply licence.

Ownership, regulation and structure

The UK retail supply licence is held by Scottish Power Energy Retail Limited, registered at Companies House. The licence sits within Ofgem's published register of licensed domestic gas and electricity suppliers and can be searched at ofgem.gov.uk. The supplier operates under the standard Ofgem Domestic Gas and Electricity Supply Licence conditions, including the Standards of Conduct, the Retail Energy Code, the Smart Metering Installation Code of Practice, and the Priority Services Register requirements for vulnerable customers.

The Scottish Power group structure in the UK separates the retail supply business from the regulated networks business and the generation business. SP Energy Networks operates the regulated electricity distribution networks in central and southern Scotland and Merseyside, Cheshire, North Wales and Shropshire, under licences regulated by Ofgem under price-control settlements such as RIIO-ED2. Scottish Power Renewables operates the generation portfolio. The retail licence at Scottish Power Energy Retail Limited is structurally separate from those entities.

The ultimate parent is Iberdrola SA, headquartered in Bilbao, Spain, and listed on the Madrid Stock Exchange. Iberdrola publishes consolidated group financial statements under International Financial Reporting Standards. The UK retail entity's accounts are filed at Companies House and are publicly accessible under Scottish Power Energy Retail Limited and the wider Scottish Power Limited group filings.

The UK head office is in Glasgow. Field engineering for smart-meter installation operates through a mix of in-house teams and accredited contractor networks; gas-emergency response is delivered by Gas Safe registered engineers operating to the cadent and SGN networks where Scottish Power supplies gas, and electrical work is delivered by appropriately qualified engineers. Scottish Power does not currently operate a regulated credit business in the UK retail brand and is not authorised by the Financial Conduct Authority in that capacity.

Frequently asked questions

Who owns Scottish Power?

Scottish Power Energy Retail Limited is the UK retail energy supply entity. The ultimate parent is Iberdrola SA, the Bilbao-headquartered Spanish utility group, listed on the Madrid Stock Exchange. The UK head office is in Glasgow. The wider group also operates SP Energy Networks (regulated electricity distribution in central and southern Scotland and parts of England and Wales) and Scottish Power Renewables (one of the UK's largest onshore-wind operators).

What tariffs does Scottish Power offer in 2026?

The named tariff range includes Standard Variable (the default that tracks the Ofgem default tariff cap), Online Fixed (a fixed-term online-managed product), Help Beat the Cap (a cap-tracking discounted variable product, where currently offered to new customers) and Smart EV (a smart-meter and electric-vehicle bundle with cheaper off-peak unit rates). Specific live unit prices are not quoted in this article because the cap is recalculated quarterly; the customer-specific tariff information label is the authoritative current figure.

How is Scottish Power rated by Citizens Advice and Ofgem?

Citizens Advice publishes a quarterly star rating across five weighted service dimensions. Scottish Power has historically sat mid-pack among the larger suppliers, with movement quarter to quarter. Ofgem also publishes complaints per 100,000 customers each quarter, and Scottish Power has been above the supplier average in some recent quarters and closer to the average in others. Readers should check the most recent published Citizens Advice and Ofgem figures at citizensadvice.org.uk and ofgem.gov.uk before drawing conclusions.

Is Scottish Power genuinely green given its parent group's renewables business?

Scottish Power Renewables, the sister business within the wider group, is one of the largest UK onshore-wind operators and operates offshore-wind assets including East Anglia ONE. The retail supplier markets 100 percent green electricity backed by group generation and by Renewable Energy Guarantees of Origin (REGO) certificates where physical match is not direct. The annual Fuel Mix Disclosure published under the Electricity (Fuel Mix Disclosure) Regulations 2005 is the authoritative percentage breakdown of supplier-procured generation by fuel source.

How long does a switch to or from Scottish Power take in 2026?

UK domestic energy switches operate under the Faster Switching programme with a target of five working days from the gaining supplier's confirmation, plus a 14-day cooling-off window. The losing supplier is required to issue a final bill within six weeks of supply takeover under Ofgem Standard Licence Condition 31E. Smart meter handover behaviour depends on whether the meter is SMETS1 (which can temporarily drop into dumb mode pending DCC migration) or SMETS2 (where the switch is invisible to the meter).

What is the relationship between Scottish Power, SP Energy Networks and Scottish Power Renewables?

All three sit within the wider Scottish Power Limited group, which is owned by Iberdrola SA. The retail supply licence is held by Scottish Power Energy Retail Limited and is structurally separate from SP Energy Networks (regulated electricity distribution in central and southern Scotland and parts of England and Wales) and Scottish Power Renewables (the generation business). Ofgem requires structural separation between regulated network and retail supply activities; the three entities are separate licensed or registered businesses.

How we verified this article

The Ofgem licence position for Scottish Power Energy Retail Limited was verified against Ofgem's published supplier licence register and Companies House at find-and-update.company-information.service.gov.uk. The customer-base figure of around 3.5 million accounts reflects the most recent publicly available disclosures from the supplier and parent group at the time of writing.

Citizens Advice quarterly star rating positioning and Ofgem complaints per 100,000 customers data are described in directional terms only. Readers should consult the most recent Citizens Advice supplier table at citizensadvice.org.uk and the most recent Ofgem quarterly complaints publication at ofgem.gov.uk for current published figures before drawing conclusions.

Tariff names and tariff structure descriptions are drawn from Scottish Power's published tariff schedule and customer-facing product pages. No specific live unit prices or standing charges are quoted in this article because the Ofgem default tariff cap is recalculated quarterly and any number quoted would be out of date within weeks. Readers should check the customer-specific tariff information label issued at the point of switching for current numbers.

Kaeltripton.com is an independent editorial publisher and is not paid by Scottish Power or any other supplier referenced in this article. No commission is taken on switches and no preferential placement is offered to suppliers in editorial content.

Sources

• Ofgem - Domestic supplier complaints data quarterly publication
• Citizens Advice - Compare energy suppliers customer service ratings
• Ofgem - Energy supplier licence register
• Energy Ombudsman - About the redress scheme
• Scottish Power - Tariffs and customer information
• Companies House - Scottish Power Energy Retail Limited record
• GOV.UK - Electricity Fuel Mix Disclosure Regulations 2005