About Scottish Power

Scottish Power is owned by Iberdrola, a Spanish company. The company is one of the largest suppliers of gas and electricity to homes in the UK, with 5.2 million customers.

In 1995 Scottish Power bought MANWEB (Merseyside And North Wales Electricity Board) and merged it into the company.

The Scottish Hydro brand supplies homes across Scotland.

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Scottish Power customer satisfaction survey results

Area of performance Star rating
Which? customer score
Customer service & Complaints
Value for money
Bills (accuracy and clarity)
Helping you save energy

Scottish Power customer score

In September and October 2016 we surveyed 8,917 UK adults who pay for their household energy about their experience with their gas and electricity suppliers.

The percentage customer satisfaction score is based on the responses consumers gave for both overall satisfaction and their likelihood to recommend the energy supplier to a friend. Both questions are given equal weighting, and only those giving a valid response to both questions are included in the analysis. The responses are analysed and scaled to give a rating from 0-100%.

For a full round-up of the Which? Switch energy satisfaction survey results, see our customer satisfaction survey results page.

Scottish Power's fuel mix disclosure

All energy suppliers have to provide information about the mix of fuels they use to generate energy supplied to gas and electricity customers, and its environmental impact.


The fuel mix below reflects the year 1st April 2014 - 31st March 2015. These figures are officially updated published on the 1st October of each year.

ScottishPower fuel mix

Coal: 46.40%
Natural gas: 30.30%
Nuclear: 2.30%
Renewable*: 20.00%
Other: 1.00%
Radioactive waste calculations (grams per kWh): 0.002
Carbon (grams per kWh): 540
* Wind, hydro and solar power.

About Iberdrola

Iberdrola is a Spanish owned company, with operations in the UK, Spain, United States, Mexico, Brazil, Greece, Portugal, France, Germany, Italy, Poland, Guatemala, Bolivia and Chile.

Contact Information

Customer service number for existing customers - 0800 027 0072 or 0345 270 0700

Contact Which? Switch by phone

You can call us on 0800 410 1149 or 01259 220 235.

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Energy Customer Satisfaction Results

Tired of poor customer service from your energy supplier? See how customers rated 23 of the UK's gas and electricity suppliers in our latest survey.

Latest tariff updates

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