The most useful clean-energy comparison starts with the service required and the impacts that matter in a particular place. Supplying annual electricity, meeting an evening peak and providing heat are different tasks. Define the task before asking which technology is best.
This framework is for readers evaluating a proposal or an energy ranking. It separates eligibility, measurable impacts and preference weights so the conclusion can be checked. A real project may combine generation, efficiency, transmission, demand flexibility and storage.
Define the service and system boundary
Write down the location, delivery point, annual energy, timing, reliability requirement and decision period. Identify what is already available: grid connections, existing generation, flexible loads and local resources. A generator’s annual output alone leaves its contribution at a critical hour unresolved.
The IPCC’s 2022 assessment of energy systems discusses options in the context of integrated systems, regional conditions and mitigation pathways. Use that systems perspective to identify complementary resources and infrastructure. Comparing plant-level costs while omitting a consequential connection or balancing requirement can distort the decision.
First screen for requirements that must be met, such as delivery deadline, available land, water limits and grid access. Mark unresolved requirements for investigation. A preference score should be applied only after the option has a credible way to deliver the required service.
Compare like quantities
On a narrow screen, scroll the table sideways. Keyboard users can focus the table region and use the arrow keys.
| Criterion | Comparable basis | Questions that change the result |
|---|---|---|
| Climate | Lifecycle greenhouse gases per unit of delivered service | Which construction, fuel, methane and end-of-life processes are included? |
| Air quality | Specified pollutants and affected populations | Where do emissions occur and under which operating conditions? |
| Land, water and ecosystems | Area and water use with location and time defined | Are water withdrawal and consumption distinguished? What habitat is affected? |
| Materials and waste | Material requirements, service life and disposal or recovery route | Is recovery available for this project and material? |
| Cost and timing | Same currency year, financing assumptions and service boundary | Are connection, fuel, replacement and decommissioning included? |
| Dependable supply | Contribution during relevant demand and stress periods | What complementary capacity, storage or demand response is needed? |
The EIA’s 2022 explanation of levelized electricity costs and value is useful for understanding what a plant-cost metric includes and why it needs context. Record the study edition and assumptions. Cost per generated MWh and the cost of serving a specific load throughout the year answer different questions.
For emissions studies, keep the functional unit, lifetime, capacity factor and lifecycle boundary beside the result. A range often communicates the evidence better than a single rounded number. Preserve uncertainty when comparing options with overlapping estimates.
Test whether the ranking depends on preferences
Fictional two-option screen: two eligible proposals are scored from 1 to 5, with 5 preferred. On climate, cost and delivery-time criteria, proposal A scores 5, 3 and 2; proposal B scores 3, 4 and 5. These are invented scores, not assessments of named technologies.
With weights of 50%, 30% and 20%, A scores 5 × 0.5 + 3 × 0.3 + 2 × 0.2 = 3.8. B scores 3.7. With weights of 30%, 30% and 40%, A scores 3.2 and B scores 4.1. The preferred option changes when timely delivery receives more weight.
Define the scoring scale and evidence before scoring. Keep underlying values visible and explain who chose the weights. These scores are a decision aid, not physical measurements; a small score difference is weak support when inputs are uncertain. Test plausible weights and lower-performance cases, and report ties or unresolved tradeoffs honestly.
Turn the comparison into a decision brief
Conclude with the required service, options considered, eligibility decisions, evidence sources, important uncertainties and what would change the recommendation. Assign responsibility for resolving missing information. A site study, interconnection response or supplier warranty may be the next useful evidence.
Use the efficiency project guide when reducing demand is an option, the demand guide for timing and peaks, and the wind-power guide when evaluating a site-specific resource. The strongest comparison makes its conclusion reproducible under stated priorities and remains easy to revise when the evidence changes.
Clean energy comparison and sensitivity worksheet
Clean energy comparison and sensitivity worksheet — plain-text download. Save a copy and fill it in with your own information. The file includes instructions, assumptions and references so it can be used independently.