Daniel sent us this one — he's been thinking about solar energy in Israel, specifically the weird financial and social dynamics of rooftop panels in a country where most people live in apartment buildings. He's asking how the economics actually work for selling power back to the grid, what the break-even point looks like, and how they prevent people from gaming the numbers. And then there's the collective-action problem — the building committee, the va'ad bayit, and whether one person who doesn't want panels should be able to block everyone else. His take is that the collective need should win out. He also calls self-hosting your own electricity the ultimate form of self-hosting, which I think is exactly the kind of nerdy framing that gets Herman's ears to perk up.
It absolutely does. And before we dive in, quick note — today's script is coming from DeepSeek V four Pro, which feels appropriate for an episode about energy optimization.
I'll allow it. So where do we start with this? The collective-action piece, or the economics?
Let's start with the economics, because that's where most of the misconceptions are. The feed-in tariff in Israel has gone through several iterations. Right now, the Israel Electric Corporation is paying somewhere around forty-eight agorot per kilowatt-hour for residential solar — that's about thirteen U.cents — but it depends on the specific scheme and when you signed up. The earlier adopters got much better rates. The program from 2018 through about 2023 was paying closer to fifty-five, sixty agorot. As the cost of panels dropped, the tariff dropped with it. That's the basic logic.
The golden age of residential solar arbitrage is kind of behind us.
For new installations, yes. But here's the thing — panel costs have fallen even faster than the tariff rates. A residential system in Israel now, installed, runs about four thousand to five thousand shekels per kilowatt of capacity. That's roughly eleven hundred to fourteen hundred dollars. A typical apartment rooftop system might be five to ten kilowatts. So you're looking at twenty to fifty thousand shekels total, installed. And the payback period — this is the number everyone wants — is somewhere between five and eight years for a well-sited system in Israel. After that, you're generating pure surplus.
Israel gets a lot of sun.
Israel gets about three hundred sunny days a year. The solar irradiation is roughly two thousand two hundred kilowatt-hours per square meter annually in the Negev, and about eighteen hundred to two thousand in the central region where most people live. That's genuinely world-class. For comparison, Germany — which installed massive amounts of solar — gets about a thousand to twelve hundred. Israel's solar resource is nearly double Germany's, and Germany is the country people point to as the solar success story.
Which is kind of embarrassing when you think about it. Germany, with its famously overcast skies, went all-in on solar, and Israel, where the sun is basically a national resource, has been dragging its feet for decades.
It's a classic story of institutional inertia and cheap natural gas. The Tamar and Leviathan gas fields came online and suddenly there was this abundant, domestically-produced fossil fuel. It killed the urgency for solar. But we're now in a phase where solar-plus-storage is cheaper than new gas peaker plants, even in Israel. The levelized cost of energy for utility-scale solar is now below ten agorot per kilowatt-hour in the best sites. That's less than three U.
That's utility-scale. Daniel's asking about the residential rooftop economics, which are different.
The residential calculation is: you pay upfront for the system, or you finance it. Most Israeli banks now offer green loans specifically for solar — Bank Leumi, Bank Hapoalim, they've all got products. Interest rates are around prime plus one or one and a half percent, so you're looking at maybe six or seven percent financing. You take the loan, you install the panels, and your monthly electricity bill drops — potentially to zero, if you've sized the system right. Meanwhile, you're selling excess back to the grid during the day when you're not home.
This is where Daniel's question about gaming the numbers comes in. How do they actually measure what you're selling?
This is one of those things where the technical solution is actually quite elegant and much harder to game than people assume. Every grid-tied solar installation in Israel requires a bi-directional meter — a smart meter that separately records electricity flowing into your home from the grid and electricity flowing out from your panels to the grid. These are tamper-evident, sealed by the Israel Electric Corporation, and they're read remotely. You can't just write down a number and tell the electric company what you think you generated.
What if someone installs a battery and charges it from the grid at night when rates are low, then sells it back during the day pretending it's solar?
That's a clever thought, and it's exactly the kind of thing people try. But the smart meters log power flows with timestamps. If you're exporting power at two in the morning, the utility knows that's not solar. And the feed-in tariff for solar is specifically for solar — the contract you sign specifies that you're being paid for photovoltaic generation. If there's a mismatch between expected solar production and what you're exporting, the utility's analytics will flag it. They have pretty sophisticated anomaly detection now.
The gaming is harder than it looks. But I imagine there's still some creativity out there.
There's always creativity. But the real fraud in solar isn't at the residential level — it's in the large-scale renewable energy certificate markets, which is a whole other episode. For a homeowner, the juice isn't worth the squeeze. The penalties for meter tampering in Israel are severe — we're talking criminal charges, not just a fine. And the I.has a dedicated enforcement unit. They're not messing around.
Let's talk about the apartment building problem, because that's the really distinctive Israeli piece of this. Daniel mentioned the va'ad bayit — the building committee — and the fact that one person can block a solar installation. Is that actually true?
It is, and it's a genuine barrier. Under Israeli property law, the roof of an apartment building is shared property — it's a common area. Any structural change to a common area requires the consent of all apartment owners. Not a majority — unanimous consent. This is Article 71 of the Land Law. If you want to install solar panels on the roof of a building with twelve apartments, and eleven owners say yes but one says no, you're stuck.
Which feels insane when you're talking about something that generates income and reduces the building's carbon footprint.
It's a classic collective-action problem. The holdout has veto power, and there's no mechanism to override them short of going to the Supervisor of Land Registration and arguing that the holdout is acting in bad faith. That's a legal process that takes years and costs money. Most people just give up.
What's the actual path for someone who lives in an apartment building and wants solar?
There are a few workarounds. One is what's called a rooftop usage agreement — the interested residents essentially lease the roof space from the building, paying a small annual fee to the building's maintenance fund. If you can make the holdout see that they're literally getting paid for doing nothing, sometimes they come around. Another approach is that some municipalities are now pushing what's called community solar — where the panels aren't on your building at all. You buy a share in a solar farm somewhere else, and you get a credit on your electricity bill proportional to your share. The Israel Electricity Authority has been piloting this since about 2022.
That's clever. It decouples the generation from the consumption site entirely.
And it solves the renter problem too. Daniel mentioned he rents — renters can't install solar on a building they don't own, and even if they could, why would they invest in a system with a seven-year payback when they might move in two? Community solar lets renters participate. You buy in, you get the bill credits, and if you move, you can sell your share or transfer it.
Community solar is still small-scale in Israel, right? It's not like everyone can just sign up.
It's tiny. We're talking maybe a few hundred participants across the whole country. The regulatory framework is still being built. The Israel Electricity Authority is moving slowly — they're cautious about anything that disrupts the existing utility model. is a monopoly, and while it's being gradually reformed, the pace is glacial.
Daniel also made a point that I want to press on — he said if one person objects to solar panels, they should be overruled, or it should be government-mandated. That's a pretty strong position. Where do you land on that?
I have sympathy for it, but I think the mandate approach is trickier than it sounds. If you mandate solar on all apartment buildings, you're forcing a capital expenditure on people who may not have the money. A fifty-thousand-shekel system split twelve ways is about four thousand shekels per unit — that's real money for a lot of families. And what about buildings where the roof needs structural reinforcement before it can bear the weight of panels? Who pays for that?
You'd want the mandate paired with financing and subsidies.
And Israel actually has some of this. The Ministry of Energy has a subsidy program that covers up to about twenty percent of the installation cost for residential systems, and there are additional incentives for buildings that install both solar and storage. But the programs are fragmented and the application process is bureaucratic. People get discouraged.
This is the classic Israeli administrative problem — great ideas, terrible implementation.
I wouldn't say terrible, but definitely uneven. The Ministry of Energy has some very capable people, but they're working within a system that was designed decades ago for a centralized fossil-fuel grid. The transition to distributed generation requires a complete rethink of how the utility interacts with customers, and that's happening in fits and starts.
Let's get into the break-even math more specifically, because Daniel asked about that directly. If I'm a homeowner — let's say a detached house, to keep it simple — and I install a six-kilowatt system for thirty thousand shekels. What does my cash flow actually look like year by year?
Good, let's do this. A six-kilowatt system in central Israel will generate roughly nine thousand to ten thousand kilowatt-hours per year. The average Israeli household consumes about eight thousand kilowatt-hours annually. So you're generating more than you use — you're a net exporter. Your electricity bill without solar would be roughly five hundred to six hundred shekels a month, so call it sixty-five hundred shekels a year. With solar, that bill drops to near zero — you still pay the fixed connection charge, which is about twenty shekels a month, but your consumption charges disappear. Meanwhile, your excess generation — say two thousand kilowatt-hours a year — gets sold back at forty-eight agorot per kilowatt-hour, so you're earning about nine hundred sixty shekels a year in feed-in payments.
The total annual benefit is the avoided bill plus the feed-in revenue.
About seventy-five hundred shekels a year in combined savings and revenue. On a thirty-thousand-shekel system, that's a four-year payback. After that, you're net positive. Over a twenty-five-year panel lifespan — and modern panels degrade very slowly, about zero-point-five percent per year — you're looking at total net savings of well over a hundred thousand shekels.
That's a better return than most financial investments.
It's an excellent return, and it's essentially risk-free — the sun isn't going anywhere, and the feed-in tariff is contractually guaranteed for twenty-five years. The only variable is whether electricity prices rise faster than expected, in which case your savings are even larger because you're avoiding higher bills.
This is without even factoring in the environmental benefit.
Right, I'm just talking pure economics. Israel's electricity grid is still heavily dependent on natural gas — about seventy percent of generation — with coal being phased out. Every kilowatt-hour of solar you generate displaces a kilowatt-hour of gas-fired generation, which emits about four hundred grams of CO2. So a six-kilowatt system is avoiding roughly three and a half to four tons of CO2 per year. Over twenty-five years, that's about a hundred tons. That's meaningful.
We should talk about the duck curve problem, because you can't just talk about solar without addressing what happens when the sun goes down.
The duck curve is real, and Israel experiences it acutely. Solar generation peaks around midday, then drops off sharply in the late afternoon — which is exactly when residential demand spikes because everyone comes home, turns on air conditioning, starts cooking, and so on. The grid has to ramp up gas turbines very quickly to meet that evening peak. This is where storage becomes critical. If you pair that six-kilowatt system with a ten-kilowatt-hour battery, you can store your midday surplus and use it in the evening, reducing your grid dependence even further and smoothing out the duck curve for everyone.
Batteries add cost. What does a ten-kilowatt-hour battery cost in Israel right now?
About twenty to twenty-five thousand shekels installed. So adding a battery roughly doubles the system cost. The payback period extends to maybe eight or nine years. But the battery also provides backup power during outages, which in Israel happen more often than people like to admit — not because the grid is unreliable, but because we have security situations, heat waves that strain infrastructure, and occasional rolling blackouts during peak summer demand. That backup capability has real value, even if it's harder to put a number on.
Daniel mentioned wanting to set up an air quality monitoring station too, which feels adjacent to this whole self-hosting mindset — generating your own data alongside your own electricity.
It's the same impulse. You're taking something that was previously centralized and opaque and making it local and transparent. Air quality monitoring has gotten dramatically cheaper — you can get a decent particulate matter sensor for under a hundred dollars now, and the data can feed into global networks like OpenAQ or the PurpleAir map. In Israel, air quality varies a lot by location and season — you get dust storms from the Sahara, pollution from transportation corridors, industrial emissions in Haifa. Having hyperlocal data is useful, and it creates accountability.
There's something satisfying about the idea of a home that generates its own power and monitors its own environment. It's a kind of quiet independence.
It's sovereignty at the household level. And I think that's what Daniel is getting at with the "ultimate self-hosting" line. You're not dependent on a utility for your basic needs. You're not dependent on government monitoring stations to tell you whether the air you're breathing is safe. You've brought those functions in-house.
Which connects to a broader political philosophy that I think is underappreciated. Decentralized energy generation is fundamentally disruptive to centralized authority. If every building generates its own power, the utility becomes a backup service rather than a gatekeeper.
Utilities know this. That's part of why they've been slow to embrace rooftop solar — it erodes their business model. makes money by selling electricity. Every kilowatt-hour generated on a rooftop is a kilowatt-hour they don't sell. They're not evil — they're just responding to incentives. The regulatory challenge is to redesign the utility's role so that it becomes a grid operator and reliability provider rather than a commodity electricity seller. That's the transition everyone is wrestling with.
California has been dealing with this for years — the "death spiral" where solar adoption drives up rates for non-solar customers, which drives more people to adopt solar, which drives rates higher still.
Israel is starting to see the early signs of this. has been raising fixed charges and introducing time-of-use rates to try to manage the revenue erosion. The fixed connection charge used to be negligible — now it's creeping up. That's the utility's way of saying, "Even if you generate all your own power, you still need to pay for the grid infrastructure that backs you up.
Which is actually reasonable. The grid is a shared resource. If you're connected to it at all, you benefit from it, even if you're a net exporter.
The question is how to price that fairly. A pure fixed charge is regressive — it hits low-income households harder. A demand charge based on peak usage is more equitable but harder to explain to consumers. There's no perfect solution, which is why the rate design debates are so contentious.
Let's circle back to the apartment building issue, because I think there's a solution hiding in plain sight that we haven't mentioned. What about requiring solar on new construction?
That's already happening, actually. Since 2022, all new residential buildings in Israel above a certain size are required to include solar water heating — which Israel has done for decades, famously — and now there's a push to extend that to photovoltaic panels. Several municipalities, including Tel Aviv and Herzliya, have started requiring solar-ready roof designs for new apartment buildings. The roof has to be structurally prepared for panels, with conduit runs pre-installed, even if the panels aren't installed on day one.
That's smart. It lowers the marginal cost of adding panels later.
Retrofitting conduit through an existing building is a nightmare. Pre-installing it during construction costs almost nothing. And once the infrastructure is there, the barriers to the va'ad bayit agreeing to install panels are much lower — it's just the panels and the inverter, not a whole construction project.
We're moving in the right direction, slowly. But Daniel's frustration about the holdout problem is real, and I don't think the legal framework has caught up. Unanimous consent for a shared roof is a rule designed for a different era, when rooftop changes were things like adding a storage shed or a laundry line — not installing energy infrastructure that benefits the entire building and the grid.
There's actually a proposed amendment to the Land Law that would lower the threshold for energy-efficiency improvements from unanimous consent to a two-thirds majority. It's been bouncing around the Knesset for a couple of years. The Israel Green Building Council has been pushing for it, and there's some cross-party support. But it hasn't passed yet.
What's the holdup?
The usual — competing legislative priorities, concerns about property rights, and frankly, the fact that energy policy doesn't get a lot of public attention until there's a crisis. When electricity prices spike or there's a supply crunch, suddenly everyone cares about solar. When things are stable, it slides down the agenda.
The crisis-driven policy cycle. We see it everywhere.
But I'm actually cautiously optimistic on this one, because the economics are now so compelling that even the holdouts are running out of reasonable objections. When you can show a building of twelve apartment owners that they'll collectively save tens of thousands of shekels a year, and the one person saying no is costing everyone else real money, the social pressure starts to work in the other direction.
Peer pressure as energy policy.
It's not the worst mechanism. People care about what their neighbors think. If the building next door has solar and their electricity bills are half of yours, you notice.
Let's talk about the air quality monitoring piece a bit more, because Daniel mentioned it almost as an aside, but I think it's worth unpacking. What does a home air quality setup actually look like in 2026?
The landscape has matured a lot. You can get a multi-parameter sensor that measures PM two-point-five, PM ten, carbon dioxide, volatile organic compounds, nitrogen dioxide, and ozone — all in a single unit the size of a smoke detector — for about two hundred to three hundred dollars. These things connect to Wi-Fi, upload data to a dashboard, and many of them feed into public mapping platforms. In Israel, there's a growing network of these sensors, mostly in the central region. The Ministry of Environmental Protection runs its own monitoring stations, but they're sparse — maybe a few dozen across the whole country. The citizen-science network fills in the gaps.
The data quality is good enough to be useful?
For particulate matter, yes — the low-cost optical sensors correlate reasonably well with reference-grade instruments, especially if you apply calibration corrections. For gases like nitrogen dioxide, the low-cost sensors are less reliable, but they'll still tell you if there's a spike. The trend data is what matters — you can see patterns, identify pollution sources, and figure out when to close your windows.
I can see the appeal. It's like having a weather station, but for the air you're actually breathing.
It connects back to the energy conversation in an interesting way. If you have solar panels and an air quality monitor, you've essentially built a micro-observatory for your immediate environment. You're generating clean energy and measuring its impact. There's a feedback loop there that makes the abstract benefits of solar concrete — you can literally see the air quality improve as more of your neighbors switch to electric vehicles and rooftop solar.
That's a nice vision. Though I suspect we're a long way from being able to detect the air quality improvement from a single rooftop solar installation.
The signal would be lost in the noise. But at the neighborhood or city scale, the effect is measurable. Studies in California have shown that every gigawatt-hour of solar generation displaces measurable amounts of particulate matter and ozone precursors from gas plants. The health benefits are real and quantifiable — fewer asthma cases, fewer hospital admissions, lower mortality. When you monetize those health benefits, solar looks even better as an investment.
The full social return on solar is even higher than the private financial return.
The private return is already good — four to eight year payback, decades of surplus. The social return, when you factor in avoided emissions, health benefits, and grid resilience, is probably double or triple the private return. That's the textbook case for government subsidies — you're subsidizing an activity that generates positive externalities.
Which brings us back to Daniel's point about mandates. If the social return is that high, there's a legitimate argument for requiring solar on all suitable rooftops.
The counterargument is about cost distribution and fairness. But I think the mandate argument gets stronger every year as costs fall. At some point, the cost of not installing solar — in terms of emissions, health impacts, and grid strain — exceeds the cost of requiring it.
I want to ask you about one more thing Daniel raised — he said he'd install solar even if it was barely worth it, just out of principle. Is that a common attitude, or is he unusual?
It's more common than you'd think, but it's not the majority. Most people make the decision based on economics. But there's a significant minority — maybe fifteen, twenty percent — who are motivated primarily by values. They want energy independence, they want to reduce their carbon footprint, they want to be early adopters. These people are important because they drive the early market. They're the ones who install solar when the payback is ten years, not four. Their demand helps scale the industry, which drives down costs, which brings in the economically-motivated buyers. It's the classic technology adoption curve.
The early adopters subsidize the learning curve for everyone else.
And Daniel is self-aware about this — he said he'd do it "out of principle." That's the early-adopter mindset. The fact that the economics now work even for purely financially-motivated buyers is a sign that solar has crossed into the mainstream.
Where does Israel's solar trajectory go from here? What's the next five years look like?
The official target is thirty percent renewable electricity by 2030. We're at about twelve percent now, almost all of it solar. To hit thirty percent, the installed capacity needs to roughly triple. That means a massive build-out — utility-scale solar in the Negev, rooftop solar on residential and commercial buildings, and a lot of storage. The Israel Electricity Authority has been running auctions for large-scale solar-plus-storage projects, and the bids have been coming in at very competitive prices. But the bottleneck isn't technology or cost — it's permitting and grid interconnection. has a backlog of projects waiting for grid connection approvals. Some developers have been waiting two or three years.
That's the administrative friction again.
It's the single biggest barrier. If Israel could streamline the permitting and interconnection process, the solar build-out would accelerate dramatically. The projects are financed and ready to go — they just can't get connected.
At the residential level, the bottleneck is the va'ad bayit and the unanimous consent rule.
So you've got bottlenecks at every scale — large projects stuck in permitting, small projects stuck in building committees. The technology is ready, the economics are ready, the capital is ready. It's the institutional plumbing that's clogged.
" That's a very Herman phrase.
I stand by it. The pipes of bureaucracy need to be unclogged. And that's less glamorous than announcing big renewable energy targets, but it's what actually determines whether those targets get hit.
One thing we haven't touched on — Daniel mentioned the possibility of people gaming the system by fudging numbers about how much they're selling. We talked about smart meters making that hard, but what about the installation side? Are there scams where installers put in substandard equipment and pocket the difference?
That's a real concern, and it happens. The most common scam is using panels that are lower-wattage than what's specified in the contract, or using refurbished inverters that fail early. The Israeli solar installation industry is regulated — installers need to be certified by the Ministry of Energy — but enforcement is spotty. The best defense is to do your homework: check the installer's track record, verify the equipment specifications before installation, and get a third-party inspection after. Some municipalities now require a post-installation inspection as part of the building permit process.
Buyer beware, as with any home improvement project.
But the good news is that panel quality has improved so much that even budget panels from reputable Chinese manufacturers like Jinko or Longi are quite reliable. The days of fly-by-night panel manufacturers are mostly behind us. The inverter is actually the more likely point of failure — it's the component that works hardest and has the shortest lifespan, typically ten to fifteen years versus twenty-five-plus for panels.
You should budget for an inverter replacement halfway through the system's life.
About eight to twelve thousand shekels for a residential inverter replacement, depending on the size. It's a known cost that should be factored into the financial model. Most good installers will include this in their projections.
Alright, let's zoom out a bit. We've covered the economics, the collective-action problem, the gaming question, the air quality tangent. Is there anything we're missing?
I think we should touch on the security angle, because it's uniquely relevant to Israel. Distributed solar generation makes the grid more resilient. If a central power plant goes down — whether from a technical failure or a security incident — a grid with lots of rooftop solar and battery storage is harder to cripple. Every building with solar and a battery is essentially a microgrid that can island itself during an outage. That's a strategic asset, not just an environmental one.
Energy independence at the national level starts with energy independence at the household level.
It's a nice symmetry. And it's one of the reasons the defense establishment in Israel has been quietly supportive of distributed solar. They see the resilience benefits. The Home Front Command has actually recommended battery storage for residential buildings in certain areas, not primarily for energy savings but for emergency preparedness.
That's a point that doesn't get made enough in the public conversation. Solar isn't just about climate — it's about resilience, security, and independence.
It's all of those things. And that broader framing might actually be more politically effective than the environmental framing alone. Different people care about different things — some care about climate, some care about energy independence, some care about saving money, some care about national security. Solar delivers on all of those dimensions. That's a powerful coalition.
Which is why the holdout problem is so frustrating. You've got a technology that benefits everyone across multiple dimensions, and it can be blocked by one person who just doesn't like how the panels look.
Aesthetics is actually one of the most common objections. People think solar panels are ugly. I think that's a solvable problem — building-integrated photovoltaics are getting better, and solar roof tiles are becoming more available. But it's a real barrier in historic districts and buildings with architectural significance.
There's also the concern about glare — panels reflecting sunlight into neighboring buildings or onto the street.
Modern panels have anti-reflective coatings that minimize glare. It's rarely a genuine issue, but it gets raised frequently. Usually it's a proxy for other objections — people don't want change, and they find a technical-sounding reason to justify it.
Alright, I think we've covered the terrain. Daniel asked about how the calculation pans out, how they prevent gaming, and what the break-even looks like. I think we've answered all of that.
The break-even is four to eight years for a well-sited system, depending on financing and whether you add a battery. Gaming is prevented by smart meters with remote monitoring and serious penalties for tampering. And the collective-action problem is real but solvable — through community solar, through regulatory reform, and through the sheer force of economics making the holdout position increasingly untenable.
The ultimate self-hosting — generating your own electricity — turns out to be one of the best financial decisions a homeowner can make, at least in a country with Israel's solar resource.
It really is. If you own a roof that gets sun, and you're not using it to generate electricity, you're leaving money on the table. It's that simple.
If you don't own a roof — if you're a renter like Daniel — community solar is the path, though it's still early days for that in Israel.
Early days, but growing. I expect community solar to be a much bigger part of the conversation in the next few years. It solves so many problems at once — the renter problem, the apartment building problem, the upfront cost problem. You can buy in for as little as a few thousand shekels and start getting bill credits immediately.
That's a good note to end on. Before we wrap — Hilbert has a daily fun fact for us.
What's it going to be today?
Now: Hilbert's daily fun fact.
Hilbert: The national animal of Scotland is the unicorn. It has been since the twelve hundreds, when it was adopted as a symbol of purity and power in Celtic mythology and later incorporated into the Scottish royal coat of arms.
Scotland's national animal is a mythical creature.
Can't be poached, I suppose.
actually a good point.
This has been My Weird Prompts. Thanks to our producer Hilbert Flumingtop. If you want to support the show, head over to myweirdprompts.We'll be back with another one soon.
