Is green energy more expensive?

Not necessarily. Green tariffs are now often competitively priced with standard tariffs. Some are at or below the price cap. The premium for green energy has largely disappeared as renewable generation has become cheaper. Always compare — some green tariffs are excellent value.

Does the actual electricity from a green tariff come from renewable sources?

Not directly. All electricity goes into the same National Grid, so the electrons powering your home come from a mix of sources. What green tariffs do is ensure that for every unit you use, a unit of renewable energy is added to the grid. The more people on green tariffs, the more renewable capacity gets built.

What's the difference between a green tariff and 100% renewable?

Both terms are used loosely. A '100% renewable' tariff means the supplier matches your usage with renewable energy certificates (REGOs). Some tariffs go further with 'green gas' (biomethane), direct renewable generation ownership, or carbon offsetting. Check what the tariff actually includes.

Green Energy Tariffs UK — Are They Worth It? | PocketWise

Green Energy Tariffs UK — Are They Worth It?

What green energy tariffs actually mean, how they work, whether they're truly renewable, and how to choose a genuinely green energy supplier.

By PocketWise · 20 September 2025 · Last reviewed: 20 March 2026 · 3 min read

Green energy tariffs claim to supply your home with renewable electricity (and sometimes gas). But the reality is more nuanced. Here is what green tariffs actually mean and how to choose a genuinely sustainable option.

How Green Tariffs Work

Concept	Reality
Physical electricity	All goes into one National Grid — you can’t choose which electrons reach your home
What suppliers do	Match your usage with renewable energy certificates (REGOs)
REGO	Renewable Energy Guarantee of Origin — certificate proving 1MWh of renewable generation
The impact	Suppliers buy from or invest in renewable generation

Types of Green Tariff

Type	What It Means	Genuineness
REGO-backed	Supplier buys certificates to match your usage	Basic green claim
Direct PPA	Supplier has Power Purchase Agreements with specific renewable generators	More genuine
Own generation	Supplier owns wind/solar farms	Most genuine
Green gas	Includes biomethane or renewable gas	Look for actual green gas, not just offsets
Carbon offset	Offsets emissions rather than true renewables	Least genuine (greenwashing risk)

Evaluating Genuineness

Questions to Ask

Question	Good Answer	Red Flag
Where does the energy come from?	Named wind/solar farms, direct PPAs	“Various renewable sources”
Do you own any generation?	Yes	Just buy REGOs
What % is backed by PPAs?	High (50%+)	0% — just certificates
Is gas green?	Biomethane or green hydrogen	“Carbon offset” only
Investment in new renewables?	Yes, X MW being built	No investment

Rating Scales

Rating Source	Top Rated Suppliers	What They Measure
Which? Eco Providers	Good Energy, Ecotricity, Octopus	Transparency, investment, fuel mix
Uswitch Green Accreditation	Various	Minimum green standards
Your own research	Check supplier’s fuel mix disclosure	Annual reports, websites

Best Green Energy Suppliers

Supplier	Own Generation	Green Gas	Rating
Good Energy	Yes (solar, wind)	Biomethane	Top
Ecotricity	Yes (significant wind)	“Green gas”	Top
Octopus Energy	Growing generation + PPAs	Carbon offsets (some criticism)	Good
Bulb (now Octopus)	PPAs, investment	Carbon offsets	Good
EDF	Nuclear (low carbon, not renewable)	Some offsets	Mixed
Ovo	PPAs, tree planting	Offsets	Mixed
Big Six on green tariffs	Mostly REGO-backed	Offsets	Basic

Cost Comparison

Tariff Type	Cost vs Price Cap
Best green tariffs	Often at or below cap
Premium green (small suppliers)	Sometimes 5–15% above cap
Big supplier green tariffs	Usually at cap level
Standard (non-green)	At cap (SVT)

Key point: Being green does not have to cost more. Compare prices — the best green deals compete with any tariff.

Green Gas: The Challenge

Issue	Detail
Gas is harder to green	Most UK heating is gas-based
Biomethane	Genuine green gas from organic waste — limited supply
Hydrogen	Future potential, not widely available
Carbon offsets	Common but less genuine
Long-term solution	Heat pumps, insulation, electrification

What “Green Gas” Usually Means

Claim	Typical Reality
“100% green gas”	May be offset rather than biomethane
“Carbon neutral”	Often includes tree planting or offset projects
“Biomethane backed”	Genuine green gas certificates
“Green future”	Investment in future solutions

Beyond Green Tariffs

Action	Impact
Reduce energy use	Biggest impact regardless of tariff
Home insulation	Reduces need for any energy
Solar panels	Generate your own renewable electricity
Heat pump	Electric heating from renewable grid
Switch transport	EV charged on green tariff
Demand shifting	Use energy when grid is greenest (wind, solar)

How to Choose

Priorities Guide

Your Priority	Look For
Cheapest green option	Price compare, green filter
Most genuine	Good Energy, Ecotricity, Octopus
Balance of price and green	Octopus, Ovo
Simple switch	Any major supplier’s green tariff

Checklist Before Switching

Factor	Check
☐ Price vs price cap	Competitive?
☐ Fuel mix	What % renewables?
☐ Certificate sourcing	PPAs or just REGOs?
☐ Own generation	Does supplier own wind/solar?
☐ Green gas	Biomethane or just offsets?
☐ Customer reviews	Service quality?
☐ Investment	Adding new renewable capacity?

The Bigger Picture

Action	Your Impact
Sign up for green tariff	Signals demand for renewables
Choose genuinely green	Supports suppliers investing in generation
Reduce consumption	Biggest personal impact
Advocate for change	Policy changes have largest effect

Green tariffs are one part of the puzzle. Combined with efficiency measures, they help — but the grid is decarbonising regardless as the UK builds more renewable capacity.

For more on managing energy costs, see our switching energy supplier guide and energy price cap guide.