Green Energy Tariffs UK
Compare 100% renewable electricity tariffs, discover best eco-friendly suppliers, understand true green credentials, and calculate environmental impact for 2026.
⚠️ Greenwashing Warning: Not All "Green" Tariffs Are Equal
Many suppliers claim "100% renewable" but only buy cheap REGOs certificates while supplying fossil fuel electricity. True green suppliers generate renewable energy themselves or buy directly from UK renewable generators. Look for Ecotricity, Good Energy, Octopus Energy (Super Green), and 100Green for genuine environmental impact.
100%
Renewable Electricity Available
£50-150
Typical Green Premium/Year
1.5 tonnes
CO2 Saved Per Household/Year
4.8★
Octopus Energy Rating (Best Green)
What Are Green Energy Tariffs?
Green energy tariffs supply electricity from renewable sources (wind, solar, hydro) instead of fossil fuels (coal, gas). Most offer 100% renewable electricity, while gas is either carbon-offset or biomethane.
How Green Tariffs Work
- 100% renewable electricity: Power comes from wind turbines, solar farms, hydro plants - not coal or gas power stations
- REGOs certificates: Renewable Energy Guarantee of Origin certificates prove electricity was generated from renewable sources
- Carbon-offset gas: Natural gas emissions offset through tree planting or renewable projects
- Green gas (biomethane): Gas produced from food waste, farm waste, or grass through anaerobic digestion
- Direct supply vs certificates: Best suppliers generate renewables themselves or buy directly from UK generators, not just cheap certificates
Three Types of Green Tariffs
- Type 1 - True Green (Best): Supplier generates renewable energy themselves or buys from UK renewable generators through Power Purchase Agreements (PPAs). Examples: Ecotricity, Good Energy, 100Green
- Type 2 - Renewable-Backed (Good): Buys renewable electricity through wholesale market and matches with REGOs from UK sources. Examples: Octopus Energy Super Green, OVO Beyond
- Type 3 - REGO-Only (Greenwashing): Buys cheapest electricity (often fossil fuel) then purchases separate cheap REGOs to "green" it. Minimal environmental impact. Examples: Most big six suppliers' "green" tariffs
The Grid Mix Reality: The UK grid is ~40% renewable (wind, solar, hydro), ~40% gas, ~15% nuclear, ~5% biomass. When you use electricity, you get whatever's on the grid at that moment. Green tariffs don't change the electrons you receive - they ensure money flows to renewable generators, funding more renewable capacity. Your green payment supports wind/solar farms, displacing fossil fuels over time.
Green vs Standard Tariff Costs (2026)
Green tariffs used to cost 10-30% more, but prices have converged. Many green tariffs now match or beat fossil fuel prices:
| Tariff Type |
Annual Cost (Typical Use) |
Premium vs Standard |
Renewable % |
Green Gas |
| Standard Variable (Price Cap) |
£1,758 |
Baseline |
~40% (grid mix) |
No (fossil gas) |
| Octopus Energy Flexible |
£1,758 |
£0 (same) |
100% renewable electric |
No (offset gas) |
| OVO Beyond |
£1,808 |
+£50/year |
100% renewable electric |
15% green gas |
| Good Energy Variable |
£1,858 |
+£100/year |
100% renewable electric |
6% green gas |
| Ecotricity Variable |
£1,908 |
+£150/year |
100% renewable electric |
Green gas mix |
| 100Green Variable |
£1,908 |
+£150/year |
100% renewable electric |
100% green gas |
← Scroll table horizontally on mobile →
Key Finding: Octopus Energy offers 100% renewable electricity at exactly the same price as standard fossil fuel tariffs (£1,758 price cap). OVO Beyond adds just £50/year for 100% renewable electric + 15% green gas. Premium green suppliers (Ecotricity, Good Energy, 100Green) cost £100-150/year more but directly fund UK renewable generation.
Best Green Energy Suppliers UK (2026)
These suppliers have genuine green credentials with direct renewable generation or UK PPAs:
🌍 Ecotricity
Type: True Green (generates own renewable energy)
Annual Cost: ~£1,908 (£150 premium)
Green Credentials:
- 100% renewable electricity (wind, solar)
- Generates 20% themselves, certifies rest
- Green gas from grass "gasmills"
- Vegan energy (no animal byproducts)
- Builds new UK wind/solar farms
- Founded 1995 - UK's first green supplier
Best For: True eco-warriors willing to pay premium for genuine impact
⚡ Octopus Energy
Type: Renewable-Backed (strong UK PPAs)
Annual Cost: ~£1,758 (no premium on standard tariffs)
Green Credentials:
- 100% renewable electricity on all tariffs
- 190+ UK renewable generator PPAs
- Developing own wind turbines
- Super Green tariff: carbon-offset gas
- Fan Club: 50% off near wind farms
- 4.8★ Trustpilot, Which? approved
Best For: Best value - same price as fossil tariffs with 100% renewable
🌱 Good Energy
Type: True Green (direct UK generator support)
Annual Cost: ~£1,858 (£100 premium)
Green Credentials:
- 100% renewable electricity
- Supports 2,000+ UK independent generators
- Matches usage with real renewable power
- 6% green gas (biomethane)
- Pays fair rates to small generators
- Highly rated by Ethical Consumer
Best For: Supporting UK independent renewable generators
💯 100Green
Type: True Green (only 100% fossil-free supplier)
Annual Cost: ~£1,908 (£150 premium)
Green Credentials:
- 100% renewable electricity (solar, wind, hydro)
- 100% green gas (biomethane from waste)
- Traceable gas sources (farms, food waste)
- Ethical Consumer "Best Buy"
- Which? "Eco Provider" badge
- 4-star Trustpilot rating
Best For: Only supplier with truly 100% fossil-free gas and electric
🌿 OVO Energy
Type: Renewable-Backed
Annual Cost: ~£1,808 (£50 premium)
Green Credentials:
- 100% renewable electricity
- OVO Beyond: 15% green gas
- Tree planting for every customer
- Carbon offsetting included
- Smart tariffs for off-peak usage
- Large UK supplier (5+ million customers)
Best For: Affordable green with large supplier reliability
⚙️ SO Energy
Type: Renewable-Backed
Annual Cost: ~£1,808 (£50 premium)
Green Credentials:
- 100% renewable electricity
- Customer choice in power sourcing
- Transparency-focused approach
- Merged with ESB Energy (2021)
- Competitive renewable rates
- Smaller supplier, personal service
Best For: Affordable green tariffs with transparency
⚠️ How to Avoid Greenwashing
Greenwashing: When suppliers claim "green" credentials without meaningful environmental action. Most big suppliers buy cheap REGOs (£1-2 per MWh) to label fossil fuel electricity as "renewable" without funding new renewable capacity.
Red Flags for Greenwashing:
- "100% renewable" at same price as fossil tariffs from big six: Likely just REGO certificates, not genuine renewable support
- Vague claims like "green energy": No specifics on where electricity comes from or how generated
- No mention of PPAs or generators: Not buying directly from renewable sources
- Parent company invests in fossil fuels: E.g., British Gas "green" tariff while Centrica owns gas assets
- No green gas option: Only focuses on electricity, ignoring 50% of home energy from gas
Green Credentials to Look For:
- Power Purchase Agreements (PPAs): Direct contracts with UK wind/solar farms
- Own generation: Supplier builds and operates renewable sites
- Independent generators support: Pays fair rates to small UK renewable producers
- Biomethane gas: Real green gas from food/farm waste, not just carbon offsetting
- Third-party certification: Ethical Consumer "Best Buy", Which? "Eco Provider"
- Transparent sourcing: Names generators and locations
Questions to Ask Suppliers:
- "Do you generate renewable energy yourself or buy through PPAs with UK generators?"
- "What percentage of your electricity comes from REGOs vs direct renewable purchases?"
- "Where does your green gas come from - is it biomethane or carbon-offset natural gas?"
- "Are you investing in building new UK renewable capacity?"
- "Does your parent company invest in fossil fuels?"
🌍 Environmental Impact of Switching to Green Energy
Switching to 100% renewable electricity saves approximately 1.5 tonnes of CO2 per household per year - equivalent to:
Carbon Savings Equivalents:
- 6,500 miles of driving: Same as taking car off road for 4-6 months (typical UK mileage)
- 8 return flights London-Paris: Annual short-haul aviation emissions
- 750 kg of beef: Significant meat consumption reduction equivalent
- 75 trees planted: Trees absorb ~20kg CO2/year each
UK-Wide Impact:
- 28 million UK households: If all switched to 100% renewable electricity
- 42 million tonnes CO2 saved: Annual carbon reduction
- Equivalent to: Taking 15 million cars off UK roads permanently
- Grid impact: Funds expansion of wind/solar, displacing fossil fuel plants
Beyond Carbon:
- Air quality: Wind/solar have no local air pollution vs coal/gas power stations
- Water usage: Renewables use 99% less water than fossil fuel plants
- Land restoration: Coal mines closed, land rewilded or repurposed
- UK energy security: Domestic wind/solar reduces reliance on imported gas
Your Individual Impact:
Switching to Octopus Energy 100% renewable (£0 premium) saves 1.5 tonnes CO2/year for free. Upgrading to 100Green (£150 premium, includes 100% green gas) saves additional 1 tonne CO2/year from gas = 2.5 tonnes total. Cost per tonne: £60 (very cost-effective carbon reduction).
Green Energy Tariffs: Pros and Cons
✅ Advantages of Green Tariffs
- Reduce carbon footprint: Save 1.5-2.5 tonnes CO2/year - significant personal climate action
- Fund renewable growth: Payments support building more UK wind/solar farms
- Same price options: Octopus Energy 100% renewable matches fossil tariff costs (£1,758)
- Energy security: Support UK domestic energy, reduce dependence on imported gas
- Air quality: No local pollution from wind/solar vs fossil fuel power stations
- Ethical choice: Align spending with environmental values
- Future-proof: As fossil fuels become more expensive, renewables become cheaper
- Customer satisfaction: Green suppliers often rated higher (Octopus 4.8★, Good Energy highly rated)
❌ Disadvantages of Green Tariffs
- Premium pricing: Genuine green suppliers cost £50-150/year more (though Octopus is same price)
- Greenwashing risk: Many "green" claims are just cheap REGO certificates with minimal impact
- Same electrons: You still get grid mix at home - green payment redirects money, not electricity
- Limited green gas: Most green tariffs only 0-15% biomethane, rest carbon-offset natural gas
- Smaller suppliers: Some green suppliers have fewer customers = less established customer service
- No fixed deals: Many green suppliers only offer variable tariffs, no long-term price locks
- Availability: Some premium green suppliers (100Green, Good Energy) not available in all areas
🤔 Is Green Energy Worth It?
Definitely Worth It If:
- You can afford £0-50/year premium: Octopus Energy (£0) or OVO Beyond (£50) offer excellent value
- Climate action is priority: One of most impactful personal carbon reductions available
- You value transparency: Want to know where your money goes and support UK renewables
- You're already with major supplier: Switching to green costs same or less than staying
Consider Carefully If:
- Budget is very tight: Premium green (£100-150/year) might strain finances
- You're skeptical of impact: Grid mix reality means you still get same electrons
- You want cheapest possible: Fixed fossil fuel deals sometimes £50-100 cheaper than green
Our Verdict:
YES, green energy is worth it - especially at £0-50 premium. Octopus Energy offers 100% renewable electricity at exactly the same price as fossil fuel tariffs (£1,758). No financial reason not to switch. Saves 1.5 tonnes CO2/year for free. If you can afford £150 premium, 100Green or Ecotricity deliver maximum environmental impact with 100% green gas + electric.
Avoid: Big six "green" tariffs that only use cheap REGOs (British Gas Green, EDF GoGreen, etc.) - greenwashing with minimal real impact.
Best Value: Octopus Energy Flexible (£1,758, 100% renewable electric, £0 premium, 4.8★ rated)
Maximum Impact: 100Green (£1,908, 100% renewable electric + 100% green gas, £150 premium)
How to Switch to Green Energy
5 Steps to Switch
- Choose genuine green supplier: Use our list above - Ecotricity, Octopus, Good Energy, 100Green, OVO Beyond, SO Energy
- Get quote online: Visit supplier website, enter postcode and usage (find on current bill)
- Compare costs: Check annual cost vs current tariff - aim for £0-150 premium maximum
- Sign up online: Takes 5-10 minutes - need current supplier details, meter readings, bank account for DD
- Supplier handles switch: New supplier contacts old supplier, switch takes 17-21 days, no interruption to supply
Before You Switch
- Check exit fees: If on fixed tariff, may have £50/fuel exit fee (£100 dual fuel)
- Take final meter reading: On switch date to ensure accurate final bill
- Verify green credentials: Check supplier website for PPA details, generator names, certification
- Read reviews: Trustpilot, Which?, MoneySavingExpert forum for customer service quality
Recommended Green Suppliers by Priority
- Octopus Energy: Best value (£0 premium), excellent service (4.8★), 100% renewable electric
- OVO Beyond: Affordable (£50 premium), 100% renewable electric + 15% green gas
- Good Energy: Strong ethics (£100 premium), supports 2,000+ UK generators
- 100Green: Maximum impact (£150 premium), only 100% fossil-free supplier
- Ecotricity: Pioneer supplier (£150 premium), builds own renewable sites
📊 Green Energy Tariffs Summary
What They Are: 100% renewable electricity tariffs from wind, solar, hydro - not coal/gas. Best suppliers generate renewables themselves or buy directly from UK generators, not just cheap REGO certificates.
Cost: Octopus Energy £0 premium (same as fossil tariffs at £1,758), OVO Beyond £50 premium, premium suppliers (Good Energy, Ecotricity, 100Green) £100-150 premium. Green energy now competitive with fossil fuels.
Environmental Impact: Saves 1.5 tonnes CO2/year switching to 100% renewable electricity (equivalent to 6,500 miles driving). 100% green gas + electric saves 2.5 tonnes/year total. Funds UK renewable capacity expansion.
Best Suppliers: Octopus Energy (best value £0 premium, 4.8★ rated), 100Green (only 100% fossil-free, £150 premium), Good Energy (supports UK independent generators, £100 premium), Ecotricity (pioneer, builds own sites, £150 premium), OVO Beyond (affordable £50 premium).
Greenwashing Warning: Avoid big six "green" tariffs (British Gas Green, EDF GoGreen) that only buy cheap REGOs without funding new renewables. Look for PPAs with UK generators, own generation, biomethane gas, third-party certification.
Verdict: YES, switch to green energy. Octopus offers 100% renewable at £0 premium - no financial reason not to switch. Saves 1.5 tonnes CO2/year for free. Best personal climate action available.
