Renewable Energy Guarantees of Origin (REGOs) are certificates issued by Ofgem to the operator of a renewable generation installation, certifying that 1 MWh of renewable electricity was produced. They underpin renewable supply tariffs that energy suppliers offer to consumers, the supplier buys REGOs to back up the "100% renewable" claim.
REGOs trade in a market. In 2026 they've been valued at roughly £3-7 per MWh, fluctuating with supply and demand. Over the 25-year life of a typical commercial solar system generating 1 GWh/year, REGOs can add £75k-£175k of cumulative revenue.
Under most institutional PPAs, the REGOs belong to the asset owner (the developer/funder), not the off-taker. This is because the funder's economic model includes the REGO revenue. If the off-taker wants to claim the renewable benefit themselves, they typically need to negotiate REGO transfer specifically.
The Smart Export Guarantee (SEG) is the export tariff regime that replaced the Feed-in Tariff for new installations. It requires energy suppliers above a certain size to offer an export tariff to small-scale solar exporters (under 5 MW). Rates vary by supplier, currently 1-15p/kWh depending on terms, many suppliers offer flat rates around 4-6p, others offer wholesale-linked rates.
For a commercial solar PPA, the export decision is usually: take a flat SEG rate from one supplier (simple, predictable, locks in 4-6p) or sign a Power Purchase Agreement directly with an electricity trader (more complex, can capture peak prices, more upside but more downside).