How to Evaluate an EPC Solar Proposal: What Management Should Look For
When a business decides to invest in large-scale solar, it typically receives proposals from multiple EPC contractors — each with very different details, terms, and numbers. This article offers a systematic way to evaluate them.
Don't Compare Only the Bottom-Line Price
The lowest total price doesn't always mean the best value. Look at the equipment specified — panel and inverter brand and efficiency, warranty terms, and what scope of work is actually included in the price — to compare real value between proposals, not just the price figure.
Check the Assumptions Behind Generation Estimates
Different contractors may use different assumptions to estimate expected generation. Ask what solar irradiance data source they used, how they calculate various efficiency losses, and request these assumptions in detail — to ensure the numbers being compared are on the same standard.
Consider the Contractor's Experience and Track Record
Ask about past projects of similar size and complexity the contractor has delivered, and request references from past clients to ask about their real experience. A contractor with a clear track record on similarly sized projects generally carries lower project execution risk.
Review Warranty Terms and After-Handover Service
Compare warranty length and scope for both equipment and installation work, and check what post-handover maintenance service covers and whether it carries additional cost. Since large projects run for decades, clear after-sales service matters just as much as the initial price.
Allow Enough Time for Review and Questions
Deciding on a large-scale investment shouldn't be rushed. Give the internal team time to review each proposal thoroughly, and have each contractor present and answer questions directly to the board — so decision-makers see the clearest possible picture before choosing a provider.
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