The answer is “ROOFTOP”, the most common crossword clue response for “where solar panels are often free” (Energy Saving Trust, 2026). Solar panels are typically installed on rooftops, and many UK homeowners access them at no upfront cost via government-backed schemes or finance offers.
The clue plays on the word “free” in two ways: physically free-standing on a roof surface, or financially free through zero-cost installation programmes. The term “rooftop” appears frequently in crosswords as a 6-letter answer. For homeowners, the real-world relevance is that free solar panel offers are almost always rooftop-mounted, not ground-based.
Free solar panel schemes require a suitable roof
To qualify for a free solar panel installation through the Energy Company Obligation (ECO4) scheme, your home must have a roof that faces south, east, or west and receives minimal shading (GOV.UK, 2026). The roof must also be structurally sound and have at least 10 square metres of usable space. Free installations are typically limited to low-income households or those receiving specific benefits. The average 3.5kWp rooftop system under ECO4 saves a household around £300 per year on electricity bills.
Rent-a-roof schemes offer no-cost solar panels
Some providers offer “rent-a-roof” arrangements where a third party owns the panels on your rooftop and you pay a reduced electricity rate. Under these agreements, the installer claims the Smart Export Guarantee (SEG) payments, which average 5p per kWh exported (Ofgem, 2026). You get free electricity generated during daylight hours, but the panels remain the provider’s property. These deals typically last 20–25 years and require a roof in good condition with no planned replacements.
Crossword clues often reference rooftop solar panels
Crossword setters use “where solar panels are often free” to point to “ROOFTOP” because it is a common, six-letter word that fits grid patterns. The clue relies on the double meaning of “free”, both no-cost and not attached to the ground (Energy Saving Trust, 2026). For UK homeowners, the clue also reflects the reality that most solar panel installations happen on roofs, not gardens or walls. If you see this clue in a puzzle, the answer is almost always “rooftop”, not “ground” or “wall”.
A worked example
A 1930s semi-detached house in Manchester with a south-facing roof could receive a free 3.5kWp solar panel system under the ECO4 scheme, saving roughly £300 per year on electricity bills. The homeowner qualifies for the scheme because they receive Pension Credit, and the installation is fully covered with no upfront cost. The system generates around 3,000 kWh annually, cutting grid electricity use by 25%. With 0% VAT on installations until March 2027, the total value of the system is approximately £7,000, but the household pays nothing. Over 25 years, total savings from avoided electricity costs could reach £7,500, based on current Energy Saving Trust estimates. The roof must have at least 10 square metres of clear, south-facing space with no shading from trees or chimneys to qualify.
| Item | Figure |
|---|---|
| Upfront cost after grants | £0 |
| Yearly savings | £300 |
| Payback period | Immediate |
| 25-year lifetime savings | £7,500 |
What homeowners often get wrong
The most common mistake is assuming any roof orientation qualifies for free solar panels under ECO4. Three frequent errors cause homeowners to miss out or face unexpected costs.
- Believing north-facing roofs work Many homeowners think any roof direction is fine for free solar panels. In reality, north-facing roofs receive minimal direct sunlight and disqualify a home from ECO4-funded installations, which require a south, east, or west orientation for adequate generation.
- Ignoring shading from trees or chimneys Homeowners often overlook nearby trees or chimney stacks that cast shadows on their roof. Even partial shading can reduce a system’s output by 20% or more, making the roof ineligible under the scheme’s efficiency rules and voiding the free installation offer.
- Assuming all free offers are government-backed Some homeowners sign up with private companies promising “completely free” panels without checking ECO4 eligibility. This can lead to hidden lease charges or long-term contracts that cost more than buying panels outright, with some deals locking homeowners into 20-year agreements.
Quick reference
- The crossword clue “where solar panels are often free” has the 6-letter answer ROOFTOP, referencing both physical placement and financial cost.
- ECO4 provides free rooftop solar panels to low-income households in receipt of benefits such as Pension Credit or Universal Credit.
- A qualifying roof must face south, east, or west, have at least 10 square metres of space, and receive minimal shading throughout the day.
- The average 3.5kWp rooftop system under ECO4 saves a household roughly £300 per year on electricity bills over its 25-year lifespan.
- Rent-a-roof schemes offer no upfront cost but may involve long-term contracts that reduce your home’s resale value or lock in escalating electricity rates.
Frequently Asked Questions
The answer is ROOFTOP. This clue appears in crosswords because solar panels are commonly mounted on rooftops and can be free through government schemes.
You can get free solar panels through the Energy Company Obligation (ECO4) scheme if you qualify as a low-income household. Rent-a-roof schemes also offer no-cost installation, but the provider keeps the SEG payments (GOV.UK, 2026).
Your roof must face south, east, or west, have minimal shading, and be structurally sound with at least 10 square metres of usable space. Free installations are limited to low-income households or benefit recipients (GOV.UK, 2026).
