Path-Q Solar
How does a power purchase agreement compare with buying solar when my electricity use is unpredictable?
Answer
With unpredictable use, compare the PPA price for actual solar energy with the cost of buying and operating a system sized for your expected load. A PPA can reduce upfront risk and shift maintenance responsibility, but you pay for contracted production or delivered energy under terms that may not align with your changing consumption; ownership provides more control but leaves performance and utilization risk with you.
Key points
- Determine whether the PPA charges for all system production or only energy delivered to the property.
- Model high-use, low-use, vacancy, expansion, and operating-hour scenarios.
- Check whether excess production is exported and who receives its value.
- Compare the PPA price and escalator with avoided utility costs under each usage scenario.
What it depends on
- Load variability and operating schedule
- PPA pricing and escalation
- System size and production guarantee
- Utility rates and export compensation
- Contract term, buyout, and transfer provisions
Risks and trade-offs
- A PPA may remain payable even when the business uses less energy than expected.
- Ownership may produce more upside but can leave unused capacity and maintenance costs with the owner.
- Expansion, closure, relocation, or changes in operating hours can create contract friction.
Information you may need
- Interval load data and future operating plans
- PPA price, escalation, and payment basis
- Production guarantee and system size
- Utility rate and export documents
Your next step
What to do next
Ask for a scenario analysis covering low, expected, and high electricity use, then compare the PPA with cash and financed ownership on total cost and flexibility.
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