Price Hedge
A £60-70/MWh strike looks attractive against £90-110/MWh wholesale — millions in benefit if prices stay elevated.
Basis Risk
VPPA settles on wholesale, but your bill is 40-60% non-commodity costs. Cover 60-70% of demand to limit exposure.
Shape Risk
Solar settles on summer/daytime output that may not match your consumption. Diversify wind + solar to smooth.
The financial case for VPPAs has strengthened considerably in the UK. Wholesale electricity prices have roughly doubled since 2021, making long-term price certainty increasingly valuable. A VPPA at a strike price of £60-70 per MWh looks attractive against current wholesale prices of £90-110 per MWh. Over a 10-15 year contract term, this can deliver millions in net financial benefits if wholesale prices remain elevated. However, VPPAs also carry downside risk: if wholesale prices fall significantly below the strike price, your business pays the difference, and the VPPA becomes a net cost. This is the fundamental risk-reward trade-off that every VPPA buyer must assess.
Basis risk is the most important risk concept to understand before entering a VPPA. The VPPA settles against the wholesale electricity price, but your business pays a retail electricity price that includes network charges, supplier margins, policy costs, and other non-commodity components that typically comprise 40-60% of your total bill. If wholesale prices fall but non-commodity costs rise, you could be paying the developer under the VPPA while your total electricity bill continues to increase. Sophisticated buyers model these correlations carefully and often use VPPAs to cover no more than 60-70% of their total demand to limit basis risk exposure.
Shape risk — sometimes called profile risk — is another key consideration. The VPPA settles against the actual generation profile of the renewable project, which for solar means higher output in summer months and during daytime hours. Your business's consumption profile may not match this pattern, creating periods where you are receiving VPPA settlement payments when your consumption is low and paying the VPPA difference when consumption is high. Wind PPAs have different shape characteristics to solar, and many corporate buyers diversify across technologies to smooth this profile mismatch. A professional energy advisory can model how different VPPA profiles interact with your actual half-hourly consumption data before you commit.
Counterparty credit requirements are a practical barrier for many mid-sized businesses. VPPA developers need confidence that the buyer can meet payment obligations if the market price falls below the strike price for sustained periods. This typically requires an investment-grade credit rating or a parent company guarantee. For businesses without this credit profile, aggregation structures are emerging where multiple smaller buyers pool their demand to create a creditworthy offtaker. Some developers also accept bank guarantees or letters of credit in lieu of balance sheet strength. The UK VPPA market is maturing rapidly, and these structures are becoming more accessible each year.
