SOLAR SPY’s Post

PR vs. Climate Change 🤔 Performance Ratio (PR) is assuming near-perfect conditions, often looking stellar in months like June with 80–95%, but here’s the problem... How do you define a single theoretical maximum when PV plants operate across multiple geographies, inclinations, technologies and weather conditions? Think about it: ☀️ Irradiation angles 🌡️ Module & ambient temperatures 📈 Trackers, bifacial gains, degradation 🌦️ Increasing climate unpredictability We gather all this data… and still judge performance with a static, outdated metric? Let’s take 2025: Climate variability is distorting historical weather models (TMY), making PR-based assessments even more unreliable. Monthly correction factors help, but even IPPs and EPCs are struggling to prove plant performance with confidence. 📍Real story: A CEE plant, right before handover to the O&M team, was flagged for underperformance. No major defects. Strings and inverters mostly fine. So… what was wrong? Turns out, projected ambient and module temperatures significantly deviated from TMY data. To make sense of the collected data in April... we had to average May and June conditions. 🚧 Detective work, delays, stress. All this, just to understand real-time output. 💡 The better way? Energy Performance Index (EPI)! ✅ Compares actual yield vs. expected yield from peer plants ✅ Reflects real operational conditions ✅ Accounts for degradation, tech specs, and weather ✅ Enables objective benchmarking across portfolios Curious how EPI could simplify performance validation in your portfolio? Let’s connect. #solarpv #energyefficiency #solarpower #pvperformance #energymonitoring #renewables #energymanagement #solaranalytics #OM #solartechnology #digitalenergy #energytransition #IPP #EPC #solarassetmanagement #climateimpact #AIinEnergy #EnergyPerformanceIndex  #EPI #renevables #PVsolar #photovoltaics

Marek Konrad Gasior

Renewable Energy for Business. PV, BESS, Investment and Energy Market

1mo

Really interesting take! PR has definitely felt outdated for a while—especially with how unpredictable weather’s become. EPI sounds like a much smarter way to benchmark performance. Curious to hear how EPI adoption is progressing among IPPs and whether it's influencing contract structures or investor confidence.

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