CurveBlock
Contracts for Difference (CfDs) are a government mechanism designed to stabilise wholesale income for selected low‑carbon generators by guaranteeing a strike price and using auction rounds to allocate support. CfDs remove much wholesale price risk for supported projects, but access has historically been aimed at projects above certain scales and technologies capable of participating in auctions, which limits direct applicability for many small‑scale assets.
Smaller generators often rely on merchant sales into wholesale markets or negotiate Power Purchase Agreements (PPAs) with offtakers. PPAs provide a private contract that can stabilise revenues relative to merchant exposure; their terms vary widely and can include fixed prices, floors, collars or index‑linked formulas. For very small projects, sleeved or aggregated PPA arrangements and community energy offtakes are common ways to secure more predictable cash flows.
Revenue profiles also reflect system charges, balancing costs and locational constraints. Developers and investors must factor in shape risk (when generation does not match demand), potential curtailment, and settlement arrangements which affect short‑term income. Insurance, forecasting and operations & maintenance provisions further influence long‑run net returns.
For retail investors considering fractional exposure to renewables, these differences matter: a fund or fractional share tied to CfD‑backed assets will have a materially different risk profile from one exposed to merchant PV or small wind with PPAs. Evaluating the contractual architecture behind cash flows — whether auction‑backed, PPA‑secured or merchant‑exposed — is central to understanding volatility, downside protection and the nature of the income stream.