The Rise of Renewable Energy in the UK

The UK has made remarkable progress in renewable energy over the past decade. Wind, solar, and hydropower now regularly account for more than 40% of the country’s electricity generation. For households, this shift has opened up a growing market in green energy tariffs — deals that allow you to ensure your electricity comes from renewable sources.

But with so many options available, it can be hard to know what you’re actually getting — and whether paying a premium (if any) is genuinely worthwhile. If you want to compare energy deals, it only takes a few minutes.

How Do Renewable Energy Tariffs Work?

It’s important to understand that ‘green’ electricity tariffs don’t literally send wind or solar power down your specific cable. The National Grid doesn’t work that way — electricity from all sources mixes together. Instead, what a renewable tariff does is ensure that for every unit of electricity you use, your supplier buys the equivalent amount from renewable generators and injects it into the grid on your behalf.

Renewable Energy Guarantees of Origin (REGOs)

Suppliers verify this through Renewable Energy Guarantees of Origin certificates — REGOs — which are issued to renewable generators for each megawatt-hour of clean electricity they produce. When you’re on a green tariff, your supplier retires the appropriate number of REGOs to match your usage. This is a real, auditable process regulated by Ofgem. You can also free heating and insulation grants to see what’s available.

100% Renewable vs Mixed Tariffs

Some tariffs claim 100% renewable electricity. Others offer a mixed approach, such as 50% renewable with the rest from lower-carbon sources. A smaller number of suppliers go further, matching your gas usage with carbon offsets or offering 100% green gas from biomethane sources.

What Renewable Deals Are Currently Available?

The green tariff market has evolved significantly. Here’s what to look for when comparing deals:

• 100% renewable electricity: Now offered by most major suppliers including Octopus Energy, E.ON, EDF, and Scottish Power. Many standard tariffs now include renewable electricity as standard rather than as a premium add-on.
• Green gas tariffs: Biomethane (produced from organic waste) is the primary source. These tariffs typically carry a small premium but are available from suppliers like Bulb (now part of Octopus) and Green Energy UK.
• Carbon-offset packages: Some suppliers offer to offset the carbon from your gas usage through certified projects — tree planting, methane capture, and similar schemes.
• Time-of-use tariffs: Innovative tariffs like Octopus Agile offer variable pricing based on grid demand, which is often lower (or even negative) when renewable generation is high. These can deliver significant savings if you have flexibility in when you use electricity.

Do Green Tariffs Cost More?

This is the key question, and the answer has changed considerably in recent years. A few years ago, green tariffs carried a noticeable premium. Today, many 100% renewable electricity tariffs are priced identically to standard deals — or in some cases are among the cheapest available.

The reason is straightforward: renewable energy is now often the cheapest form of generation. Wind and solar have no fuel costs, so once the infrastructure is built, electricity is cheap to produce. This cost advantage increasingly flows through to consumers.

Things to Check Before Switching

Before committing to a green tariff, it’s worth checking a few things:

• REGO transparency: Ask your supplier how many REGOs they hold and whether they’re sourced domestically. Some suppliers purchase cheap REGOs from overseas rather than supporting UK renewable generators.
• Exit fees: Fixed-rate green tariffs may carry exit fees if you leave early. Make sure you’re comfortable with the contract length.
• Gas included? Check whether the renewable element covers both electricity and gas, or just electricity.
• Tariff type: Is it fixed or variable? Fixed gives price certainty; variable follows the market.

Is Switching to a Renewable Tariff Worth It?

For most households, switching to a 100% renewable electricity tariff costs nothing extra compared to standard deals — making it an easy win for both your conscience and your wallet. The real question is simply whether the overall tariff is competitively priced.

The best approach is to compare renewable and standard tariffs side by side. You can often find a green deal that undercuts what you’re currently paying, giving you cleaner energy and lower bills at the same time. Compare available renewable deals in your area now and see what you could save.