Your Eversource bill has 14 line items. Most homeowners only look at the total. The 4 numbers that actually matter are buried in the middle.
1. kWh used
Top-right of page 1. This is your total electricity consumption for the month. A MA single-family home uses ~700–1,200 kWh/mo; multi-zone heat pumps push that to 2,000+ in deep winter. Solar offsets this number 1:1 (kWh you produce = kWh you don’t buy).
2. Supply rate ($/kWh)
Page 2 under “Supply Services”. Eversource’s default Basic Service rate in eastern MA is ~$0.17/kWh as of winter 2026 (it changes every 6 months). If you’ve switched to a Competitive Supplier, look for their per-kWh rate instead.
3. Delivery rate ($/kWh)
Page 2 under “Delivery Services”. This is what Eversource charges to transport electricity to your home, around $0.17/kWh in 2026. This part of the bill is what solar can’t fully eliminate, you’re still connected to the grid, but net metering credits offset most of it.
4. Customer charge
Bottom of delivery section. A flat ~$8/month for being connected. This stays even with solar; you’ll still pay it as long as you keep grid backup.
The honest summary
Multiply your kWh by your supply+delivery rate (~$0.34/kWh total in 2026). That’s the part solar can offset. Add the $8 customer charge to whatever solar leaves over, that’s your minimum future bill if you offset 100% of usage.
For a 1,000 kWh/mo household: $340 today → $8 with full solar offset = $332/mo savings = $3,984/year.