100% Renewable Tariffs: Real or Greenwashing?

Most UK '100% renewable' tariffs use REGOs to claim green status — without buying any extra renewable energy. Here's how to spot the real ones.

The REGO Loophole: Delving Deeper into Greenwash Claims

The UK energy market, lauded for its increasingly diverse generation mix, presents a perplexing challenge for environmentally conscious consumers: how to genuinely support renewable energy. The concept of a "100% renewable electricity tariff" sounds unequivocally positive, yet, as we at Power Guardian UK have extensively investigated, the reality is often far more nuanced. The core issue lies with Renewable Energy Guarantees of Origin (REGOs) – a system originally designed to track renewable energy but now, arguably, enabling a form of greenwashing.

A REGO certificate is a digital document that verifies 1 Megawatt-hour (MWh) of electricity has been generated from an eligible renewable source, such as wind, solar, or hydro. These certificates are issued to renewable generators by Ofgem, the UK's energy regulator. Crucially, REGOs can be bought and sold separately from the physical electricity itself. This creates a disconnect: an energy supplier can purchase electricity from the wholesale market (which includes fossil fuels and nuclear) and then buy enough REGOs for a paltry sum – sometimes as low as £0.50 per MWh – to badge their tariff as "100% renewable" or "green."

Practical Example: Imagine your home consumes 3,000 kWh (3 MWh) of electricity annually. A supplier offering a REGO-backed "100% green" tariff might buy 3 MWh of electricity from the national grid, which on a typical day might be 40% gas, 20% wind, 15% nuclear, 10% solar, etc. Simultaneously, they purchase 3 REGO certificates from a wind farm. While your bill says "100% renewable," the actual electrons flowing into your home are still a mix, and crucially, the supplier hasn't stimulated any additional renewable generation beyond what was already happening. The wind farm would have generated that electricity regardless. This mechanism, while complying with current regulations for green claims, offers minimal, if any, additional environmental benefit. It's essentially an accounting trick, allowing companies to appear green without changing their procurement practices in a way that truly drives the energy transition, akin to buying carbon offsets for a flight without reducing your travel.

The Geniunely Greener Suppliers: Driving Real Change

Identifying truly impactful renewable tariffs requires looking beyond the "100% renewable" label. The key distinction lies in whether the supplier is genuinely investing in, or directly procuring from, new or existing renewable generation. This usually involves Power Purchase Agreements (PPAs) or direct investment.

Understanding Power Purchase Agreements (PPAs)

A PPA is a long-term contract between an electricity generator (e.g., a wind farm) and an electricity buyer (e.g., an energy supplier or a large corporation). PPAs provide stable income for renewable project developers, making it easier for them to secure financing for new projects. When a supplier enters into a PPA, they are committing to buying a guaranteed amount of renewable energy directly from a specific project. This direct relationship means their customers' payments are more directly supporting renewable generation, and in many cases, facilitating new renewable capacity.

Leading Examples in the UK:

Good Energy: A long-standing pioneer in the UK renewable market. Good Energy prides itself on its strong direct relationships with over 2,000 independent renewable generators across the UK. They primarily use PPAs, meaning they physically source a significant portion of their electricity directly from wind, solar, and hydro projects. Their commitment extends to advocating for policy changes that genuinely support renewable energy, rather than relying on loopholes. Ecotricity: Another established green energy provider, Ecotricity operates on a "bills into mills" principle. They are known for reinvesting a substantial portion of their profits into building new renewable energy projects in the UK, particularly wind farms and sun parks. This direct investment model means that customers' money is actively helping to expand the UK's renewable generation capacity. Their "Green Gas" tariff also uses biomethane sourced from anaerobic digestion plants, offering a more sustainable alternative to natural gas, though this is a separate consideration from electricity. Octopus Energy: While Octopus does utilise a mix of PPAs and REGOs, their approach is significantly more robust than many competitors. They have been active in securing large-scale PPAs, often with innovative financing structures, to support new renewable projects. Furthermore, Octopus is a leader in smart tariffs (like "Octopus Go" for EV charging or "Agile Octopus" for dynamic pricing), and their "Fan Club" tariff directly links customers to specific local wind turbines, offering discounts when those turbines are generating. They are also investing heavily in smart grid technologies and are one of the key players in the smart export guarantee (SEG) market, encouraging domestic solar generation.

Comparison of Supplier Approaches: