Path-Q Solar
How much can solar save when most of my electricity is consumed immediately rather than exported?
Answer
High immediate self-consumption generally improves solar savings because each on-site kilowatt-hour offsets a purchase that would otherwise be made from the grid. The actual savings depend on the avoided retail energy rate, fixed charges that remain, system production, load timing, and the value assigned to exported energy.
Key points
- Self-consumed energy is usually valued differently from exported energy.
- A production system can have high annual output but modest savings if output occurs when demand is low.
- Shifting flexible loads into solar-production hours can increase self-consumption without adding generation.
- Battery storage may increase self-consumption but adds cost, losses, and replacement considerations.
What it depends on
- Hourly load profile
- Solar production by hour and season
- Retail purchase rate and export compensation
- Fixed and non-bypassable charges
- Ability to shift loads or use storage
Risks and trade-offs
- Annual energy totals can overstate savings when timing is ignored.
- A larger system may produce more exports with lower value.
- Storage can improve timing but may not be economical without favorable price differences.
Information you may need
- Interval electricity use if available
- Current bill and rate structure
- Solar production estimate by time period
- Export treatment and load-shifting options
Your next step
What to do next
Model savings hourly or by billing interval using separate values for self-consumed and exported energy.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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