Green PPAs (green power purchase agreements) are long-term contracts where an electricity buyer commits to purchasing power from renewable energy sources, typically tied to a specific wind or solar project. They are used to secure renewable supply, manage electricity price risk, and support credible sustainability claims through defined energy attribute ownership and reporting.
What Are Green PPAs?
Green PPAs are structured agreements between a renewable generator (or project owner) and a buyer such as a corporation, municipality, or charging operator.
– The buyer commits to a defined volume of renewable electricity (MWh) over a fixed term
– The seller commits to deliver energy and associated renewable attributes under agreed rules
– The contract defines price structure, volume, settlement method, and certificate treatment
Why Green PPAs Matter for EV Charging
Green PPAs are relevant for charging networks and fleet depots where electricity sourcing affects cost and carbon reporting.
– Provide renewable-backed electricity for depot charging, destination charging, and public networks
– Improve energy price predictability versus spot market exposure
– Support customer and tender requirements for renewable electricity procurement
– Strengthen market-based emissions reporting when attributes are owned and cancelled correctly
– Scale across multi-site portfolios where on-site renewables cannot cover all demand
How Green PPAs Work
A typical green PPA includes governance steps that support auditability.
– Define eligible renewable source, term, contracted volume, and pricing model
– Allocate renewable attributes to the buyer under agreed certificate rules
– Set settlement approach (physical supply, sleeved supply, or financial settlement)
– Publish or provide documentation for allocation, certificate cancellation, and impact reporting
Common Green PPA Types
– Physical PPA – renewable electricity is supplied through the grid under supplier arrangements
– Sleeved PPA – a utility/supplier “sleeves” the renewable power to the buyer and manages balancing and billing
– Virtual PPA (VPPA) – a financial contract for differences where the generator sells to the market and the buyer settles price differences while receiving renewable attributes
– On-site PPA – renewable generation installed at the buyer’s site (rooftop or canopy PV), often increasing self-consumption
Green PPAs vs Green Energy Tariffs
– Green energy tariffs are retail products usually backed by certificates and are simpler to implement
– Green PPAs are longer-term procurement contracts often linked to specific projects and can provide stronger sourcing and pricing structure
– Both require clear attribute cancellation and reporting to make credible renewable claims
Key Elements to Define Clearly
– Renewable attribute ownership, certificate type, and cancellation rules
– Matching approach (annual matching vs tighter time/location matching expectations)
– Volume definition (as-produced, baseload, shaped) and mismatch handling
– Risk allocation: curtailment, imbalance costs, and force majeure
– Reporting requirements for audits, ESG disclosures, and customer claims
Key Benefits
– Long-term renewable sourcing with documented audit trail
– Potential price hedging and improved cost predictability
– Stronger “additionality” narrative compared to certificate-only procurement, depending on structure
– Suitable for multi-site charging operators and large fleets
– Can be combined with DER (PV, BESS) and dynamic load management to optimize peaks and improve self-consumption
Limitations to Consider
– Contract complexity and negotiation workload
– Renewable generation profile may not match charging demand profile
– Claims must be clearly defined to avoid greenwashing risk
– Grid constraints and peak charges still require operational control and planning
Related Glossary Terms
Power purchase agreement (PPA)
Green power purchase agreement
Green energy certificates
Guarantees of Origin (GO)
Green energy tariffs
Market-based emissions
Renewable integration
Self-consumption