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Real-time monitoring and data-driven rate optimization for residential solar in Portland, ME
Data updates every 15 minutes via the SolarEdge API
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15-minute interval data
Average energy by hour of day (since Nov 2024)
Average energy by day of week (since Nov 2024)
Average energy by month (since Nov 2024)
A. Understanding the Solar Credit Policy
How your solar credits work under CMP's net metering program
When your panels produce more than you use, the excess flows to the grid and you earn kWh credits at the full retail rate.
When you use more than you produce (nights, cloudy days, winter), credits are applied to offset your bill before you pay for grid power.
Credits expire 12 months after they're earned where oldest credits are used first (FIFO). Summer surplus must be used by the following summer or forfeited.
Credits are banked as kWh units. 1 credit = 1 kWh offset, regardless of rate changes. If rates rise, your banked credits become worth more.
B. Track Your Credits
Credits earned and used each month since solar installed
Running credit balance (kWh banked)
Credits tracked by month earned (12-month rolling expiration)
C. Bills and Savings
Actual bills vs. counterfactual bills without solar (by service period)
Progress toward system payback ($43,620)
A. Understanding Your Options
Three delivery rate structures available
| Rate A | Electric Tech | TOU | |
|---|---|---|---|
| Service Charge | $30.21/mo | $41.24/mo | $26.71/mo |
| Delivery | $0.1365/kWh | $0.1056/kWh | $0.50 on / $0.07 off |
| Supply | $0.127/kWh (same for all rates) | ||
B. Recommendation
Rate A and Electric Technology are within $4 over the most recent 15 months. The best choice depends on weather patterns and usage changes that will become clearer with more data. TOU is definitively worse for your solar setup. See Supporting Analysis below for the seasonal breakdown.
C. Supporting Analysis
Shows usage and weather variability impact across years
Shows seasonal pattern and breakeven crossings