Energy as a Service (EaaS) is a contracting model that bundles some mix of energy supply, energy assets, efficiency improvements, management and performance outcomes into a recurring service payment. A common model is for the provider to design, finance, install and operate equipment at your sites so you pay a fee instead of buying the assets, but not every EaaS contract includes on-site equipment. Depending on the provider, the scope can include efficiency upgrades such as lighting and HVAC, on-site generation such as solar, battery storage, building controls, monitoring and maintenance. Payment may be a fixed subscription, a charge per unit of energy delivered, or a share of measured savings.
At a glance
- EaaS often turns energy projects that would be capital purchases into multi-year service contracts.
- Where the contract includes on-site equipment, the provider commonly owns, operates and maintains it; you pay for access to it or for the results it delivers.
- Scope, pricing and performance commitments vary widely between providers and contracts.
- Contracts often run for many years, so exit terms, buyout options and measurement methods matter as much as price.
- What a provider can offer at a site depends on local utility rules and energy regulations, which vary by state and country.
What problem it solves
Energy improvements often pay back over years, but they compete for capital with everything else, and most mid-sized organizations don’t have staff who specialize in energy procurement, equipment or operations. Projects stall even when the savings case is sound.
EaaS moves upfront cost and operational work to a provider. In the common equipment-backed model, the provider finances and installs the equipment, runs and maintains it, and is paid over the contract term from a fee or from the savings; other offers center on energy supply, management software or efficiency outcomes without on-site equipment. For organizations with many sites, it can also bring consistent monitoring and reporting across locations, which helps with utility cost control and sustainability reporting.
How it works
Assessment. The provider audits current energy use, equipment and utility bills to set a baseline and identify projects, for example lighting retrofits, HVAC upgrades, controls, solar or batteries.
Contract. The parties agree the scope, the term, how the fee is calculated, and any performance commitments. Where savings or output are guaranteed, the contract defines the baseline, how results are measured and what happens if they fall short.
Installation and ownership. Where the contract includes on-site equipment, the provider commonly installs it and keeps ownership during the term. Third-party ownership of some assets, such as on-site solar, is restricted or regulated in some jurisdictions, which affects what can be offered where.
Operations and monitoring. Meters, sensors and building systems typically report usage to the provider’s platform, often over IoT connections. Where the contract includes equipment, the provider maintains it and tunes performance; most offers include regular reporting.
End of term. The contract ends with renewal or exit on terms set at the start; where it includes equipment, those terms usually cover purchase or removal.
When it matters for buyers
- When an energy project can’t win capital approval. Spreading the cost into an operating fee changes the budget conversation, though accounting treatment should be confirmed (see CapEx vs OpEx).
- When a site needs resilience. Battery storage or on-site generation under an EaaS contract can support critical loads during grid outages, alongside, not instead of, UPS protection for IT equipment.
- When managing many sites. Central monitoring across locations makes waste easier to find and costs easier to compare.
- When sustainability commitments need delivery. Providers can supply data for reporting, but check that their methods fit the reporting framework you use.
- When reviewing long-term commitments. A multi-year contract tied to buildings you may leave, sell or expand needs clear assignment and exit terms.
The monitoring side of EaaS relies on connected meters and sensors; see our Internet of Things (IoT) overview for how those devices are deployed and managed.
Questions to ask vendors
- Exactly which equipment and services are included, and what is excluded?
- How is the fee calculated, and how can it change over the term?
- If you guarantee savings or output, how is the baseline set, who measures results, and what is the remedy for a shortfall?
- Who owns the equipment during and after the term, and what are the buyout and removal terms?
- What happens if we close, sell or move out of a site before the contract ends?
- How do your monitoring devices connect to our network, and who secures and patches them?
- What local utility or regulatory approvals does the project need, and who obtains them?
How it differs from a power purchase agreement
A power purchase agreement (PPA) is a contract to buy electricity from a particular generating asset, such as a solar array on your roof or a wind farm elsewhere, usually at an agreed price over a long term. It is about the supply of power. EaaS is broader: it can cover reducing how much energy you use, managing when you use it, storing it and maintaining the equipment, as well as generating it. Some EaaS contracts include a PPA for their solar or generation component, so check which parts of an offer are energy supply and which are services. Both differ from a traditional utility contract, where you buy energy from the grid and own and maintain any equipment yourself.