True-Up Tracker

Grid energy by PG&E billing cycle

Net so far

431.9kWh imported

Imported 712.3 · Exported 280.3 kWh

Peak (4 to 9 p.m.) 3.2 exported · Off-peak 435.0 imported

Charges so far

$112.22estimate

NEM charges for 2 cycles, before taxes. No PG&E bill in yet.

Projected true-up

$591–$648

Year-end 2,026 to 2,349 kWh imported, if the rest of the year goes like '24 - '25 or '25 - '26

Tesla VPP credit

$02027 season

No events marked yet; the season runs May 1 to October 31. Tesla pays it, apart from PG&E's true-up.

What the system saved

$424estimate so far, of $566 without solar or Powerwalls

Estimates of PG&E's and WestLight Energy's charges.

Paid$141

PG&E $112 · WestLight $29

Solar saved$449

Against buying it all from the grid

Powerwalls$25 cost on the bill

Keeping charge, 10 days$19 cost

Storing solar, 25 days$9 cost

VPP events, 2 days$4 saved

About $9 less

Covering only 4 to 9 p.m. on those 25 days. Under NEM2, exporting solar earns about what importing it later costs, so storing it pays only between 4 and 9 p.m.

Payback

Solar paid for itself in 2025, and is projected to pay for the whole system in 2028

The Powerwalls won't pay for themselves in dollars before their warranty ends.

What they did instead: 35 outages, 6 d 12 h off the grid, the longest 2 d 4 h

Years only. '21 - '22 and '22 - '23 are estimated from '23 - '24 by solar output and the average rate in PG&E and Peninsula Clean Energy's rate comparisons; the federal credit is taken as a rate on the cost.

'26 - '27 by billing cycle

Imported
Exported
Running net
'25 - '26
Projected

kWh. Bars are each cycle's imports above zero and exports below; the lines are the net since October 1.

Billing cycles

Oct 5 to Nov 2Imported 576.6Exported 206.7Net 369.8 imported$97.22 est.
Nov 3 to Nov 10 (so far)Imported 135.7Exported 73.6Net 62.1 imported$15.00 est.

est.: calculated from PG&E's published rates. Before taxes; the Base Services Charge and WestLight Energy's generation charges are billed separately.