Do solar batteries pay off in Kentucky? Only if later is worth more than now

Is a solar battery worth it in Kentucky? On electric bill savings alone, rarely. Under the net metering rules for newer systems at LG&E and KU, a battery earns the gap between the energy charge you’d pay at night and the credit you’d get for exporting at noon. That gap is about 4¢ per kWh, and the battery loses some energy on every cycle. For a typical home battery, that comes to well under $100 a year.

Batteries can make sense in Kentucky. It’s just a different purchase: you’re buying backup power for outages, and the bill savings are a small bonus. The rest of this article does the math both ways, so you can price what you’re actually buying.

As of November 1, 2026: tariff figures are from the LG&E and KU rate sheets in effect this fall, and tax rules are current as of this date. Both change. Check the sources below before you rely on them.

The rule: storing only pays when later is worth more

A squirrel buries acorns because winter food is worth more than autumn food. A battery works the same way. It pays only if the energy you take out later is worth more than the energy you put in now, after losses.

Under NMS-2, here’s what “now” and “later” are worth:

• Now (midday export): 7.534¢ per kWh at KU, 7.089¢ at LG&E
• Later (evening use): the energy charge, 11.396¢ at KU and 11.499¢ at LG&E in the sheets in effect this fall, plus per-kWh riders that vary by month

The spread is 3.86¢ at KU and 4.41¢ at LG&E per kWh. That’s the most a battery can earn per kWh shifted, before losses.

One cycle, worked out

Say your battery stores 10 kWh of solar you’d otherwise export, and returns 90% of it in the evening. Round-trip efficiency varies by product; check the spec sheet for yours.

At KU:

• You give up 10 kWh × 7.534¢ = $0.753 in export credits.
• You avoid buying 9 kWh × 11.396¢ = $1.026 from the grid.
• Net gain: $0.27 a day.

Utility and rate	Gain per 10 kWh cycle (90% efficient)	Gain per cycle (85% efficient)	Cycles a year assumed	Annual bill value (90%)
KU, standard residential (RS)	$0.27	$0.22	300	$82
LG&E, standard residential (RS)	$0.33	$0.27	300	$98
KU, time-of-day, on-peak discharge	$1.41	$1.29	250 weekdays	$353
LG&E, time-of-day, on-peak discharge	$1.03	$0.93	250 weekdays	$257

Riders, which add to the value of avoided purchases, are left out. They’d raise the standard-rate figures by a few dollars a year, not enough to change the conclusion.

The time-of-use exception, and its limits

LG&E and KU offer an optional residential time-of-day energy rate, RTOD-Energy, that widens the gap considerably. In the sheets in effect this fall:

• KU: off-peak 7.811¢, on-peak 24.040¢ per kWh
• LG&E: off-peak 9.312¢, on-peak 19.307¢ per kWh

On-peak hours are weekdays only, Eastern Standard Time year-round: 1 p.m. to 5 p.m. from April through October, and 6 a.m. to 10 a.m. plus 6 p.m. to 10 p.m. from November through March. Weekends are off-peak.

Three cautions before you plan around it:

• Enrollment is capped. Each utility limits RTOD-Energy and RTOD-Demand combined to 500 residential customers, first come, first served, and requires an advanced meter. If you leave, you may have to wait 12 months to return.
• Summer peak overlaps solar. From April through October, on-peak hours fall when your panels are already producing, so a battery adds less than the table suggests. The winter morning and evening peaks are where it helps most.
• It’s a whole-house rate. Everything you use on weekday peak hours costs more, not just what the battery covers. Model your full year of usage on the rate before you switch.

Kentucky Power also files residential time-of-day rates with the PSC. Read the current sheet and the availability terms if you’re in its territory.

Federal incentives for storage in 2026

Homeowners: none. Battery storage was one of the categories in the residential clean energy credit, Section 25D, which ended for expenditures after December 31, 2025.

Businesses and leasing companies: a different, longer schedule. Under Section 48E, energy storage technology is exempt from the 2027 cutoff that now applies to wind and solar. The storage credit runs at full value for projects that begin construction through 2033. It drops to 75% for 2034, 50% for 2035 and nothing after. Two conditions matter:

• Storage under 1 MW, or that meets wage and apprenticeship rules, qualifies for the 30% rate rather than the 6% base.
• Storage that begins construction after December 31, 2025 must stay under the “material assistance” limits for prohibited foreign entities. The minimum non-prohibited share of cost is 55% for construction beginning in 2026, rising five points a year to 75% after 2029. That’s the owner’s compliance burden, and it can affect which products are offered.

For a farm or small business that owns its battery, that can mean a real credit. Ask your CPA. For a homeowner, it shows up only indirectly, through the price of a leased battery.

What a battery costs per kWh it delivers

Here’s the number most quotes leave out. Take an illustrative battery at $13,000 installed, cycling 10 kWh a day for 300 days a year over 10 years. It delivers about 27,000 kWh. That’s 48¢ for each kWh it delivers, against about 11.4¢ for power from the grid. A 30% credit taken by an owner, $3,900 here, doesn’t come close to closing that gap.

Scenario at $13,000	Annual bill value	Simple payback
KU standard rate	$82	About 159 years
LG&E standard rate	$98	About 133 years
KU time-of-day, best case	$353	About 37 years
LG&E time-of-day, best case	$257	About 51 years

Even the best case runs well past a typical 10-year battery warranty.

Pricing backup honestly

If bill savings won’t pay for the battery, the real question is what backup is worth to you. One way to see it is cost per outage-hour avoided, over a 10-year life:

Your outage pattern	Outage hours over 10 years	Cost per outage-hour at $13,000
2 outages a year, 6 hours each	120	About $108
4 outages a year, 8 hours each	320	About $41
6 outages a year, 12 hours each	720	About $18

Use your own history. Your utility’s outage notifications, or your memory of the last few storm seasons, will do. Then ask what’s at stake in those hours: a well pump, a sump pump, medical equipment, a freezer full of beef, a home office. For some households, $40 an hour to keep those running is easy to justify. For others, a smaller backup plan does the job.

Also ask what the quote actually backs up. A battery that powers a few critical circuits behaves very differently from one that tries to run a whole house with central air.

Questions to ask any battery quote

Before you compare prices, get these answers in writing:

• What is the usable capacity in kWh, and the continuous power in kW? Capacity sets how long it lasts; power sets what it can run at once.
• Which circuits will it back up, and can it start your largest motor loads, such as a well pump or central air?
• What round-trip efficiency does the manufacturer list, and what does the warranty guarantee about remaining capacity after 10 years?
• Does the warranty cap total energy throughput, and how many years of daily cycling would reach that cap?
• How will the battery be programmed: backup reserve only, self-consumption or time-of-day shifting? Who can change those settings later?
• What permits and utility notifications does the installation need, and who files them?

When a battery does make sense in Kentucky

• You lose power often or for long stretches, and the loads at risk matter.
• You’re on a time-of-day rate, your winter peak use is high, and you’ve modeled a full year.
• A business owns it, can use the 48E credit and has demand charges a battery can trim. That’s a separate analysis.
• You’re on legacy NMS-1 and want backup. With one-for-one netting, though, the battery saves you almost nothing on your bill. Our Kentucky net metering explainer explains why.

If you’re still deciding on solar itself, settle that question first. Our article on solar after the 30% credit shows how thin the margin is before a battery enters the picture.

What we’d do

• Write down your outage history for the past three years and list the loads you’d want running.
• Price the battery per outage-hour avoided, and compare that with the alternatives a licensed electrician can quote.
• Ignore bill savings above about $100 a year on a standard rate unless the proposal shows its tariff math.
• If time-of-day interests you, model 12 months of your usage on RTOD-Energy before you switch, and confirm that enrollment is open.
• Get the round-trip efficiency, warranty years and warranted throughput in writing.

If you want the full model run on your own interval data and outage history, our Battery & Storage Economics analysis delivers a written report in 7–10 business days. We don’t sell batteries, and no manufacturer or installer pays us.

This article is general information, not tax advice. Confirm tax questions with a tax professional.