October 2025
Learn how to choose the best So Energy tariff for your needs with our guide to tariff types and pricing, plus tools to help you save on energy bills.

Confused by energy tariffs? You’re not alone. With so many options like fixed, variable, EV-friendly, and tracker tariffs, it’s easy to feel overwhelmed. But the right choice can save you money, reduce your carbon footprint, and give you peace of mind.
In this guide, we’ll break down everything you need to know about energy tariffs, including:
Whether you’re an electric vehicle owner, a solar panel household, or simply looking for the most cost-effective option, this guide will help you make an informed decision. Ready to take control of your energy costs? Let’s dive in.
Choosing the right energy tariff can make a big difference to your bills and lifestyle. Here are the most common options:
Fixed Tariffs: Your unit price stays the same for a set period, which is great for budgeting and avoiding market fluctuations.
Standard Variable Tariffs (SVT): Rates go up or down with in line with Ofgem’s price cap. You could save when prices fall, but pay more when they rise.
Prepayment Tariffs: Pay-as-you-go energy using a meter or app. Ideal for those who want tighter control over spending, but often more expensive.
Economy 7 Tariffs: These come with two rates with one being cheaper at night, and higher during the day. The higher rate is usually more expensive than a supplier’s standard flat rate. Good if you use appliances overnight or have storage heaters.
EV Tariffs: Designed for electric car owners, offering lower rates during off-peak hours for charging.
Tracker Tariffs: Prices follow the market, giving transparency, but come with frequent changes.
Time-of-use Tariffs (TOU): These TOU tariffs offer different rates depending on the time of day, encouraging you to use energy during off-peak hours when it’s cheaper. Ideal for households with flexible routines or smart appliances that can run overnight.
Understanding what makes up your energy tariff helps you compare deals effectively. Here are the main elements to help understand the jargon.
Unit Rates:The cost per kilowatt-hour (kWh) of energy you use. This is the biggest factor in your bill.
Standing Charges: A fixed daily fee that covers the cost of supplying energy to your home, paid regardless of how much energy you use.
Contract Length: How long you’re tied to the tariff. Fixed deals often run 12 to 24 months, while variable tariffs have no fixed term.
Exit Fees: Charges for leaving your contract early. Always check before switching to avoid surprises.
Billing Methods: Options include Direct Debit, credit payment, or prepayment meters. Direct Debit often comes with discounts.
Dual Fuel: Electricity and gas from the same supplier. These packages can be cheaper and more convenient.
The energy price cap is a safeguard designed by the UK’s energy regulator, Ofgem, to protect consumers from unfairly high charges. Here’s what you need to know:
What is the Energy Price Cap?
It’s a limit set by Ofgem on the maximum price suppliers can charge for standard variable tariffs. It ensures fair pricing for households.
How Does It Affect Tariffs?
Price Cap Calculator Tools
Online calculators help you estimate savings or compare capped rates with other deals, which can be useful for deciding whether to switch.
Seasonal Variations
The cap is reviewed every 3 months, and often changes with wholesale energy costs, meaning winter bills can differ from summer ones.
Before choosing a tariff, it’s important to understand how and when you use energy. Here’s what to consider:
Typical Usage: Review past bills or use a smart meter to see your average use.
Peak Times: Identify when your energy use spikes. Usually things like morning routines, evening cooking, or overnight charging.
Seasonal Variations: Heating in winter and cooling in summer can significantly affect usage.
Household Size: More people usually means higher energy demand.
Work-from-Home or Office-Based: Home workers often use more daytime energy.
Day or Night Patterns: Night owls or EV owners may benefit from off-peak tariffs.
Weekday or Weekend: Families often use more energy on weekends.
Special Needs: Medical equipment or home businesses can increase baseline usage.
Not all energy users have the same needs. Certain households and technologies require tailored tariffs and smart solutions:
Electric Vehicle Owners: EV tariffs offer cheaper overnight rates for charging, helping reduce running costs.
Heat Pump Users: Consistent energy demand means fixed tariffs can provide stability.
Solar Panel Owners: Export tariffs let you earn money by selling extra energy to the grid.
Vulnerable Customers: Priority services and capped tariffs ensure affordability and support.
Smart Meters: Provide real-time usage data, smart meters make it easier to choose the right tariff and track energy use.
Energy-Efficient Appliances: Lower overall usage, reducing bills and carbon footprint.
Home Automation Systems: Smart thermostats and connected devices help optimize energy use.
Battery Storage: Store excess solar energy or off-peak electricity for later use, which boosts savings.
So Energy offers a range of tariffs designed to suit different lifestyles and priorities. Here’s a quick guide to help you choose:
Protection Against Price Rises: Your unit rate stays the same for the contract term.
Budgeting Certainty: Predictable bills make financial planning easier.
Contract Length: 12 or 24 months. Check what works for you.
Exit Fees: Charges apply if you leave early, so consider your flexibility needs.
Best For: Customers who value stability and want to avoid market volatility.
No Commitment: Switch anytime without exit fees.
Market Responsive: Prices change with wholesale market costs, so rates could go up or down.
No Exit Fees: Total flexibility for changing circumstances.
Price Cap Protection: Keeps rates fair under regulatory limits.
Best For: Those who prefer freedom and don’t mind price changes every 3 months.
Special EV Rates: Customers get a low rate of 6.5p per kWh between midnight and 5am for charging their electric car. And the same great price applies to any other electricity you use during those hours.
Off-Peak Benefits: Maximize savings by charging during cheaper hours.
Extra Perks: Designed to support EV owners’ unique needs.
Best For: Electric car drivers looking to cut charging costs.
Tracker Mechanism: Prices follow a market index for transparency.
Clear Pricing Structure: Know exactly how your rate is calculated.
Advantages and Risks: Benefit when prices fall, but prices can also rise.
Update Frequency: Rates reviewed regularlytay informed.
Best For: Eco-conscious customers who want market-linked pricing and transparency.
Personalised Pricing: Tailored peak, off-peak, and super off-peak rates based on your actual energy habits.
Smart Technology: Uses historic smart meter data to create a tariff that fits your lifestyle, not industry averages.
Savings Potential: Switch without changing habits and save up to £150; shift 20% of your energy use to off-peak times and save up to £200 per year against So Flex.
Fair and Transparent: Moves away from one-size-fits-all pricing, giving you control and flexibility.
Ideal For: Households with smart meters who want a tariff that reflects their unique energy patterns and supports a greener grid.
Learn more about So Unique and time-of-use tariffs.
Picking the best energy tariff doesn’t have to be overwhelming. These tools and resources can make the process easier:
Smart Meter Data: Use real-time data from your smart meter to identify patterns and select a tariff that matches your lifestyle.
Online Calculators: Estimate your monthly or annual costs based on usage and compare different tariffs quickly.
Customer Service Support: Energy suppliers often offer expert advice. Don’t hesitate to call for guidance tailored to your needs.
Independent Comparison Websites:Trusted platforms let you compare tariffs across multiple suppliers, ensuring transparency and helping you find the best deal.
Choosing the right energy tariff doesn’t have to be complicated. By understanding the different tariff types, key components, and tools available, you can make informed decisions that fit your lifestyle and budget. Whether you’re looking for stability with a fixed tariff, flexibility with So Flex, or tailored savings with So Unique, So Energy has options designed for real people and real homes.
Ready to take control of your energy costs and support a greener future? Explore So Energy tariffs today and find the plan that works best for you.