How to Read Your HECO Bill (With Solar)

Your first post-solar HECO bill will look nothing like what you are used to. Instead of the simple math — you used this much electricity, you owe this much money — there are now export credits, time-of-use rate breakdowns, rider charges, and possibly BYOD+ adjustments scattered across the page. It looks like it was designed to confuse you. It probably was not, but the effect is the same.

Here is how to read the thing.

Find Your Rate Schedule First

Look near the top of the bill for your rate schedule code. This three- or four-letter designation tells you everything about which HECO program you are on, and it determines how the rest of the bill works. Schedule R-SRE means you are on the Smart Renewable Energy Export program — the current program for new solar installations.^[1] R-NEM is the legacy Net Energy Metering program, grandfathered in and no longer accepting new customers. R-CGS is Customer Grid Supply (also legacy), and R-CSS is Customer Self-Supply. Plain Schedule R means standard residential with no solar.

If you just got solar installed and your bill says R-SRE, you are all set. If it still says Schedule R with no solar designation, your interconnection may not be complete. That happens sometimes — call us or call HECO to check the status before you panic about a high bill.

The Two Numbers That Tell the Story

Somewhere in the usage section, your bill shows grid energy consumed (imported) and energy exported. These two numbers are the heartbeat of your post-solar bill.

Grid energy consumed is electricity you pulled from HECO when your solar was not producing enough — nighttime, heavy cloud cover, or periods when you were running the AC, dryer, and oven simultaneously. This is the number you pay for. Energy exported is the excess your solar system pushed back onto the grid. This is the number that earns you credits.

During a sunny month, your exported kWh should be substantial during daytime hours. If you had clear skies all month and your export numbers are tiny, something is off. Check your monitoring app. Dirty panels, a microinverter issue, or new shade from a neighbor's tree can all tank your production without any obvious sign from the ground.

How Your Export Credits Break Down

Under SRE, your export credits are not just one flat rate. They are broken into time-of-use periods, and the rate differences are dramatic:^[2]

Time Period	Oahu Rate	What to Expect
Daytime (9am–5pm)	$0.135/kWh	Most exports without battery
Peak (5pm–9pm)	$0.329/kWh	Most exports WITH battery (highest value)
Overnight (9pm–9am)	$0.189/kWh	Minimal exports (solar not producing)

Look at where your credits are landing. If you have a battery and the bulk of your export credits show up in the daytime column at $0.135, your battery is not doing its job. It should be storing that daytime energy and releasing it during the peak window at $0.329 — nearly 2.5 times the value. Open your Tesla app and make sure it is set to "Time-Based Control" mode. That single setting change can be worth $50 or more per month.

The Charges That Never Go Away

Even if your solar completely offsets your electricity usage, you are still paying HECO something every month. Expect a minimum charge of roughly $25 to $30 for maintaining your grid connection.^[3] That is the cost of staying plugged in, and it applies to every grid-connected system regardless of how much solar you produce.

Below that, you will see rider charges — small per-kWh surcharges for infrastructure maintenance, the renewable energy fund, and other programs. These apply to both the energy you import and the energy you export. There is also a fuel adjustment that fluctuates with HECO's fuel costs, which affects your import rates and can nudge export credit values slightly.^[5] None of these charges are large individually, but they explain why your bill is $28 instead of zero even in a month where you generated more than you used.

BYOD+ on Your Bill

If you enrolled in HECO's BYOD+ program,^[4] the big upfront payment (roughly $4,600 for a Powerwall 3) was a one-time lump sum paid separately. It does not appear on your monthly bill. What you may see are small monthly credits or records of dispatch events — the times HECO drew energy from your battery during the peak demand window. These entries confirm the program is active and your battery is participating as agreed.

What a Healthy Post-Solar Bill Looks Like

For a typical Oahu home with a properly sized solar and battery system, the before-and-after is stark. Bills that used to run $350 to $500 per month drop to $25 to $50 — mostly just the minimum charge and riders. Some months, you will carry a credit balance forward because your system exported more value than you consumed. The first time you see a bill under $30, the system pays for itself emotionally even before the math catches up.

When Something Looks Wrong

If your post-solar bill is higher than expected, do not assume the system is broken. The most common explanation is simple: your interconnection is not actually complete yet, and HECO is still billing you at the standard Schedule R rate with no export credits. This happens more than it should, and it is fixable with a phone call.

Other possibilities: your system is underperforming due to dirty panels, a microinverter issue, or new shading. Your household usage went up — a new EV, an extra window AC unit, or a pool heater can easily eat the savings from a system that was sized for your old consumption. Or your battery is exporting at daytime rates instead of peak because the settings were never optimized after installation.

If any of this sounds familiar, contact us or call our PV Tech line at (808) 380-6845. We can pull up your monitoring data alongside your bill and pinpoint exactly what is happening.