Pros and Cons of Solar Energy for Homes and the Grid

The pros and cons of solar energy look different depending on whether you are a homeowner weighing rooftop panels or a grid operator planning a 500 MW solar farm. At grid scale, solar is now among the cheapest power ever built; on a single roof, the economics hinge on local electricity rates, upfront price and how your utility credits exported power. This guide covers both levels with sourced numbers: installed costs from Lawrence Berkeley National Laboratory (LBNL), capacity factors from the EIA, degradation from NREL, net metering rules from the California Public Utilities Commission (CPUC) and recycling projections from IRENA. For the wider picture on renewable energy, see our hub.

What are the pros and cons of solar energy?

Solar’s biggest pros are free, unlimited fuel, very low emissions and falling costs; its biggest cons are no output at night, weather dependence, high up-front cost for homes and the need for storage.

Pros of solar energy	Cons of solar energy
Sunlight is free and inexhaustible	No production at night; lower in winter and clouds
Lifecycle emissions about 41–48 g CO2e/kWh vs 820 for coal (IPCC, 2014)	High up-front cost for a home system
Cheap at utility scale: $38–78/MWh unsubsidized (Lazard, 2025)	US solar PV capacity factor only 24.0% (EIA, 2025)
No moving parts in PV; low maintenance	Batteries needed to use solar after sunset
Modular: from one panel to a gigawatt farm	Roof orientation, shade and age limit home installs
Cuts household electricity bills	Net metering credits reduced in some states (e.g. California)
Works off-grid in remote locations	Utility farms need land and transmission
Panels last decades, losing about 0.5%/yr (Jordan & Kurtz)	End-of-life recycling still developing

A photovoltaic (PV) panel is a set of semiconductor cells, usually silicon, that turn sunlight directly into direct-current (DC) electricity; an inverter converts it to the alternating current (AC) used in homes. Our how solar panels work guide explains the physics.

What are the advantages of solar energy?

Solar’s advantages are a free fuel source, very low lifecycle emissions, low running costs and some of the cheapest new electricity available anywhere.

Low cost at scale

IRENA’s Renewable Power Generation Costs in 2024 reports a global average levelized cost of electricity (LCOE) of $0.043/kWh for new solar PV, about 41% cheaper on average than the lowest-cost new fossil fuel alternatives. Lazard’s June 2025 LCOE+ puts unsubsidized US utility-scale solar at $38–78/MWh. That price advantage is why solar was the world’s largest source of new electricity for the third year in a row in 2024, adding 474 TWh (Ember).

Very low emissions

The IPCC’s 2014 review gives median lifecycle emissions of about 41 g CO2e/kWh for rooftop PV and 48 g for utility-scale PV, roughly one-twentieth of coal. Almost all of that comes from manufacturing; operating panels emit nothing.

Low maintenance and long life

PV systems have no moving parts (unless they use trackers). NREL’s PV lifetime research finds that modules typically lose less than 1% of performance per year, and Jordan and Kurtz (2013), reviewing nearly 2,000 field-measured degradation rates, found a median of about 0.5% per year. At that rate, a panel still produces about 88% of its original output after 25 years (0.995 to the power of 25 equals about 0.88 — our arithmetic).

Lower bills and energy independence

Every kWh your panels produce and you use is a kWh you do not buy. At the US average residential price of 18.2¢/kWh (EIA, August 2026), a system producing 10,000 kWh a year offsets about $1,820 of electricity if all of it replaces grid power. Solar also works where there is no grid at all — see our off-grid solar system guide.

What are the disadvantages of solar energy?

The main disadvantages of solar energy are intermittent output, low capacity factor, high up-front cost for homes, storage costs, declining export credits and land or recycling issues at scale.

It stops at night and slows in winter

Solar output follows the sun. The EIA reports that US utility-scale solar PV averaged a 24.0% capacity factor in 2025 — meaning it produced about a quarter of what it would if it ran at full power 24/7. That figure already includes nights, clouds and seasons. By comparison, nuclear ran at 91.1%.

High up-front cost for homeowners

LBNL’s Tracking the Sun data, as reported for 2025, put the median installed price of host-owned residential systems at $3.60 per watt (inflation-adjusted), down from $4.10/W in 2024. Cash purchases were cheaper at a median $3.00/W, while loan-financed systems were higher at $4.50/W. The median residential system was 7.7 kW. At $3.60/W, that median system costs about $27,700 before any incentives (our arithmetic). Renters and owners on a budget have a smaller option: in some states renters can now use plug-in balcony solar without an interconnection agreement. See our full solar panel cost breakdown by system size.

Batteries add cost

To use solar power in the evening, or during outages, you need a battery. That adds significant cost and its own replacement cycle. Grid operators face the same issue at scale: US providers added a record 10.3 GW of battery storage in 2024 (EIA), much of it to shift solar into the evening peak.

Not every roof works

Panels need a roof with good sun exposure, little shade and enough remaining life to outlast the system. North-facing roofs in the US, heavy tree cover or a roof due for replacement all reduce the value. The solar panel angle calculator helps find the best tilt for your latitude.

How long does it take for solar panels to pay for themselves?

A simple payback for a median US home system is roughly 12–13 years under favorable assumptions, but real results range widely with local rates, sunshine and net metering rules.

Here is how to estimate payback yourself:

1. System cost: size (kW) × installed price ($/W) × 1,000. Example: 7.7 kW × $3.00/W (LBNL 2025 median cash price) = $23,100.
2. Annual production: size × local production per kW. We assume 1,300 kWh per kW per year as an illustrative value for a reasonably sunny US location (this is an assumption, not a national average). 7.7 × 1,300 = 10,010 kWh.
3. Annual savings: production × your electricity rate. 10,010 kWh × $0.182 = about $1,822 per year at the EIA US average.
4. Payback: cost ÷ savings. $23,100 ÷ $1,822 ≈ 12.7 years.
5. Adjust: subtract incentives, lower savings if exports are credited below retail, and add the cost of any battery or inverter replacement.

Scenario (7.7 kW, 10,010 kWh/yr)	Installed price	Rate	Annual savings	Simple payback
Cash, US average rate	$3.00/W	18.2¢/kWh	about $1,822	about 12.7 years
Median host-owned price	$3.60/W	18.2¢/kWh	about $1,822	about 15.2 years
Cash, high-rate state	$3.00/W	30¢/kWh (illustrative)	about $3,003	about 7.7 years

Prices from LBNL Tracking the Sun (2025 data); US average rate from EIA (August 2026). Production and the 30¢ rate are illustrative assumptions. Run your own numbers with the solar panel calculator and the electricity cost calculator.

How are net metering changes like California’s NEM 3.0 affecting solar?

Net metering credits exported solar at or near the retail rate; newer tariffs such as California’s Net Billing Tariff (NEM 3.0) credit exports at a lower, value-based rate, which lengthens payback for solar-only systems and favors adding batteries.

Net energy metering (NEM) is a billing arrangement in which a utility credits customers for electricity their solar system sends to the grid. Under classic NEM, each exported kWh offset a kWh bought later at the full retail price.

The CPUC adopted Decision D.22-12-056 on December 15, 2022, creating the Net Billing Tariff as the successor to NEM 2.0. It applies to customers who submit an interconnection application on or after April 15, 2023; customers who applied by April 14, 2023 kept their existing terms. Under the new tariff, exports are credited based on the utility’s avoided cost — what it would otherwise pay for that energy at that hour — rather than the retail rate. Industry analyses of the proposal estimated large cuts to average export value. In March 2026, a California appellate court upheld the CPUC’s decision.

What this means in practice:

• Self-consumption matters more. Using your solar on-site (running appliances by day) is worth the full retail rate; exporting is worth less.
• Batteries look better. Storing midday solar for the evening peak avoids buying expensive grid power.
• Rules vary by state. Other states still offer retail-rate net metering, while some have moved to net billing. Check your utility’s current tariff before buying.

What are the pros and cons of solar at grid scale?

At grid scale, solar’s pros are rock-bottom energy costs and fast construction; its cons are midday oversupply, the need for storage and transmission, and land use.

In the US, solar produced about 7% of utility-scale electricity in 2025, with small-scale rooftop systems adding about 90 billion kWh more (EIA). Globally, solar supplied 6.9% of electricity in 2024 (Ember).

Land is the most visible issue. NREL’s 2013 survey found US PV plants used about 8.9 acres of total land per megawatt (AC), and newer high-efficiency modules use less. Agrivoltaics — pairing panels with grazing or crops — and rooftop, parking-lot and brownfield sites reduce the conflict. The other grid-scale issue is timing: when many solar farms produce at noon, prices fall and some output is curtailed, which is why new projects increasingly pair solar with batteries.

Is home solar or utility-scale solar better?

Utility-scale solar produces cheaper electricity per kWh, while rooftop solar avoids land use and transmission and puts savings directly on the owner’s bill. Both have a role.

Factor	Rooftop (residential) solar	Utility-scale solar
Typical size	Median 7.7 kW (LBNL, 2025)	Tens to hundreds of MW
Installed cost	Median $3.60/W host-owned (LBNL, 2025)	Much lower per watt; LCOE $38–78/MWh (Lazard, 2025)
Lifecycle emissions	about 41 g CO2e/kWh (IPCC, 2014)	about 48 g CO2e/kWh (IPCC, 2014)
Land use	None (uses existing roofs)	About 8.9 acres/MWac total (NREL, 2013)
Transmission needed	No; power used on site	Often yes
Who benefits	Owner’s bill and resilience	All grid customers through cheaper wholesale power
Main risk	Export credit cuts, roof condition	Curtailment, grid connection delays

Rooftop systems also add resilience when paired with a battery. Utility-scale plants usually use single-axis trackers that follow the sun, which raises output per panel.

What should you check before buying solar panels?

Check your usage, roof, local rates, export credit rules and at least three quotes before you sign.

1. Pull 12 months of electricity bills to find annual kWh use.
2. Confirm your roof has good sun exposure, little shade and years of life left.
3. Look up your utility’s current net metering or net billing tariff.
4. Get multiple quotes and compare price per watt, panel and inverter warranties, and installer track record.
5. Decide whether a battery makes sense for your tariff and outage risk.
6. Ask about permits, interconnection timelines and end-of-life take-back.

Does solar increase home value, and what happens when you sell?

Owned solar panels usually add to a home’s sale price, while leased panels or power purchase agreements (PPAs) can complicate a sale because the buyer has to take over the contract.

The largest US study, Berkeley Lab’s Selling Into the Sun (2015), analyzed almost 22,000 home sales in eight states from 1999 to 2013, about 4,000 of them with PV. Buyers paid an average premium of about $4 per watt for host-owned systems, about $15,000 for a typical system, and the premium held across states, housing markets and home types (Berkeley Lab). Those sales predate today’s lower panel prices, so treat the dollar figure as historical.

Third-party ownership is the catch. The FTC warns that a lease or PPA “might affect your options when you sell your house”: the contract may require advance notice to the provider, the buyer may need to meet credit requirements or pay fees to take it over, and ending a lease early “may be difficult and expensive.” If you plan to sell within a few years, a cash or loan purchase keeps the transaction simpler.

Why are some people getting rid of solar panels?

Most homeowners who remove solar panels do so for practical reasons: a roof that needs replacing, a lease or PPA they want out of, a sale, or equipment at the end of its life, rather than because the panels stopped working.

The common triggers:

1. Roof replacement. Panels must come off before a roof is redone and go back on afterward. The FTC advises asking installers up front “what happens if you need to repair your roof after the system is installed” (FTC). Installing on a roof with years of life left avoids this.
2. Lease and PPA contracts. At the end of a lease, the provider must remove the system and restore the roof, unless you renew or buy it (FTC). Some owners choose removal rather than a buyout.
3. Lower export credits. Under tariffs like California’s Net Billing Tariff, new exports earn less than retail (CPUC), so an expanded or replacement system may pay back more slowly than the original did.
4. Ageing equipment. Panels lose about 0.5% of output a year (Jordan & Kurtz), and inverters usually need replacing before the panels. Owners of early systems sometimes repower with newer, higher-wattage panels instead of repairing old ones.

Removed panels that still work can often be reused; others go to the recycling stream described below.

Why is my electric bill still high with solar?

A high bill with solar usually means your home uses more electricity than the panels make, your exports are credited below the retail price, or fixed utility charges still apply. It rarely means the panels have failed, but check your inverter’s production data to be sure.

1. Usage grew. A new EV, heat pump or pool pump can outrun a system sized to old bills. Re-run the solar panel calculator with 12 months of current use.
2. Export credits are lower than retail. Under net billing tariffs such as California’s, exported power earns less than the price you pay for grid power at night (CPUC), so daytime surplus no longer cancels evening use one for one.
3. Fixed and minimum charges. Connection and other non-bypassable charges are billed whether or not your panels cover your usage.
4. Seasons and true-ups. Winter output is lower, and some utilities settle net metering once a year, so one large bill can reflect twelve months.
5. Lower output. Shading, dirt, a tripped inverter or ordinary ageing cut production; compare monitored output with the installer’s estimate.

What happens to solar panels after 25 years?

Most panels keep working after 25 years, just at somewhat lower output. At the median degradation rate of about 0.5% a year (Jordan & Kurtz), a panel still makes roughly 88% of its original output at year 25. The 25-year mark is mainly when many power warranties end, not when panels stop. Owners then keep the system running, replace the inverter if it has not already been replaced, repower with newer panels, or send old modules for reuse or recycling (see below).

Does solar energy work everywhere?

Solar works across the whole US, but output varies a lot with latitude, climate and season, so the same system can produce far more in Arizona than in Washington State. Panels need daylight, not heat — in fact, crystalline silicon panels are slightly less efficient when very hot. Snow usually slides off tilted panels, and cold, clear days can be productive. What matters most is annual sunshine on your specific roof, which is why calculators use location-based solar data rather than a national average.

Can solar panels be recycled?

Yes, and the volume is set to grow: IRENA projected in 2016 that global panel waste could reach 78 million tonnes by 2050, with recoverable materials worth more than $15 billion.

A typical panel is mostly glass by weight, plus an aluminum frame, a polymer back sheet, silicon cells, copper wiring and small amounts of silver. Glass and aluminum are easy to recycle; separating the laminated cell layers and recovering high-purity silicon and silver is harder and costlier. Recycling rules vary by state and country, so ask your installer about end-of-life take-back.

History of solar costs and panel durability

Solar became cheap because module prices fell by roughly 99% over four decades, following a steady learning curve, while field studies showed panels lose only about half a percent of output a year. Those two facts, cost and longevity, underpin almost every “pro” in the table above.

In the 1970s, solar cells were mainly a niche power source for satellites and remote equipment. The DOE’s timeline credits Elliot Berman, backed by Exxon, with designing a cheaper cell that cut prices from about $100 a watt to $20 a watt (DOE solar timeline). Our World in Data’s series puts average module prices at about $132/W in 1975 and $0.27/W in 2024, both in 2024 dollars (Our World in Data).

That decline follows a learning curve: plotting module price against cumulative shipments on log-log axes gives a near-straight line, as SunPower founder Richard Swanson showed in Progress in Photovoltaics (2006). The rule of thumb that prices fall about 20% for each doubling of cumulative volume became known as “Swanson’s law.” Researchers have asked what actually drove it. Gregory Nemet (2006) found that larger plants and higher module efficiency explained most of the cost reduction from 1975 to 2001, and that experience alone explained only a small part. Kavlak, McNerney and Trancik (2018) found that higher conversion efficiency was the leading device-level factor, with R&D dominant in early decades and economies of scale more important after 2001 (MIT News). By 2024, IRENA put the global average cost of new utility PV at $0.043/kWh (IRENA).

Durability research matured in parallel. Jordan and Kurtz (2013) compiled nearly 2,000 degradation rates from field studies and reported a median of about 0.5% per year; a follow-up compendium (Jordan et al., 2016) expanded the dataset and examined how rates vary by technology and climate.

Year	Milestone	Source
1954	Bell Labs silicon cell, about 6% efficient	APS
1970s	Cheaper cell designs cut prices from about $100/W to $20/W	DOE
1975	Average module price about $132/W (2024 dollars)	Our World in Data
1982	First megawatt-scale PV plant (1 MW, Hesperia, California)	DOE
2006	Swanson publishes the PV price learning curve; Nemet analyzes its causes	Prog. Photovolt.
2013	Jordan and Kurtz: median degradation about 0.5%/yr	Prog. Photovolt.
2018	MIT study attributes the 99% cost drop to efficiency, R&D and scale	Energy Policy
2024	Module price about $0.27/W; utility PV LCOE $0.043/kWh	Our World in Data, IRENA

Scientific references

• Swanson, R. M. (2006). “A vision for crystalline silicon photovoltaics.” Progress in Photovoltaics: Research and Applications, 14(5), 443–453. doi:10.1002/pip.709
• Nemet, G. F. (2006). “Beyond the learning curve: factors influencing cost reductions in photovoltaics.” Energy Policy, 34(17), 3218–3232. doi:10.1016/j.enpol.2005.06.020
• Kavlak, G., McNerney, J. & Trancik, J. E. (2018). “Evaluating the causes of cost reduction in photovoltaic modules.” Energy Policy, 123, 700–710. doi:10.1016/j.enpol.2018.08.015
• Jordan, D. C. & Kurtz, S. R. (2013). “Photovoltaic degradation rates — an analytical review.” Progress in Photovoltaics: Research and Applications, 21(1), 12–29. doi:10.1002/pip.1182
• Jordan, D. C., Kurtz, S. R., VanSant, K. & Newmiller, J. (2016). “Compendium of photovoltaic degradation rates.” Progress in Photovoltaics: Research and Applications, 24(7), 978–989. doi:10.1002/pip.2744
• Schlömer, S. et al. (2014). “Annex III: Technology-specific cost and performance parameters.” In Climate Change 2014: Mitigation of Climate Change, IPCC Working Group III, Cambridge University Press. PDF

Bottom line

The pros of solar energy — free fuel, low emissions, long-lived panels that lose only about 0.5% a year, and some of the cheapest new power on the grid — are solid. The cons are real too: no output at night, a 24% average capacity factor, high home installation costs now that the federal credit has ended, and export credits that are shrinking in states like California. For many homes it still pays off; run the numbers with real quotes. Compare with other sources in our guides to solar energy and the advantages of renewable energy.