Renewable and Alternative Energy Options

Four childhood friends tested a prototype in a grandfather's garden. Tommi, Markku, Liisa, and Ville grew up in Tampere. They ran, rode, trained—and kept circling the same question: can you store heat in something nobody cares about? They landed on sand. Not beach sand, but crushed soapstone: scrap from Finnish fireplace factories. Heat it to 600°C using excess wind and solar power. Hold that heat for weeks. When winter hits, push air through the hot mass and feed it into district heating. In June 2025, Polar Night Energy started up the world's largest sand battery in Pornainen. For about 5,000 residents, it delivers: ↳ 1 MW thermal power, 100 MWh storage ↳ 70% lower emissions ↳ No oil ↳ 60% less wood-chip burning ↳ $4–10 per kWh—far cheaper than lithium No rare earths. No cobalt. No supply-chain drama. Just a pile of rock dust, insulation, and time. Mayor Antti Kuusela says the biggest win is steadier district-heating prices, which helps the local economy. Now look at the Middle East. Sand is everywhere. Heat is brutal. Lithium-ion packs age faster in that climate. Yet money still floods into rare-metal storage. Finland looked at fireplace waste and saw a heat plant. If one town can do this, ten towns can copy it. A hundred towns can turn district heating into a buffer for wind and solar. What's the ignored material in your industry that could do the boring, useful job better than the shiny stuff? Sources: Polar Night Energy, Interesting Engineering, The Guardian https://lnkd.in/ej2dTChZ

In Sweden, a growing number of renters are being empowered to generate their own clean energy through compact solar kits designed specifically for balconies. These plug-and-play systems allow residents in apartments to install small solar panels on railings or walls without needing access to rooftops or complex approvals. Once connected, the panels can feed electricity directly into the apartment, helping reduce reliance on traditional power sources. The simplicity of these kits is what makes them so effective. They are lightweight, easy to mount, and often require minimal technical knowledge to set up. Many systems include inverters and safety features that ensure the electricity generated can be used safely within the home. For renters who typically have limited control over building infrastructure, this provides a rare opportunity to actively participate in renewable energy adoption. Beyond individual benefits, these balcony solar solutions contribute to a broader shift toward decentralized energy systems. When many households generate even small amounts of power, the collective impact can be significant. Sweden’s approach highlights how clean energy can be made accessible to more people, not just homeowners. By removing barriers and simplifying technology, it shows that sustainability can be integrated into everyday living spaces in practical and inclusive ways. #CleanEnergy #UrbanSustainability #FutureLiving #fblifestyle #Sustainability #Community #ClearBlueCommercial #GreenEnergy #EVcharging #Solaflect

🔋 How Do Hybrid Solar Systems Keep the Power Flowing – Rain or Shine? 🌞🌧️⚡ Hybrid Solar Systems are more than just rooftop panels — they’re smart energy managers that balance solar generation, battery storage, and grid reliance to ensure uninterrupted power — day 🌅 or night 🌃. ⚙️ Here’s how energy flow works in a Hybrid Solar setup: 🌞 Daytime (High Solar Output): 🔌 Solar powers the connected load 🔋 Excess energy charges the battery 🌐 Surplus is exported to the grid (if applicable) 🌙 Nighttime / Cloudy Weather: 🔋 Battery supplies power to the load ⚡ Low battery? System auto-switches to grid supply 🚫 Grid Outage? 🛡️ Hybrid inverter + battery instantly power critical loads 🎯 Key Benefits at a Glance: ✅ Maximize usage of self-generated solar energy 🔁 Seamless backup during outages 💸 Lower electricity bills & boost grid independence 🔒 Improved reliability for homes & businesses 🌍 Whether you're an engineer designing smart solar systems or simply curious about clean energy tech — understanding Hybrid Solar flow is a game-changer!

Pumped hydro & batteries are gas-killers. Batteries are eating the high-value revenue streams for ancillary services and morning & evening peaks. Snowy 2.0 can capture much of the high-price market for overnight storage and a wet windless week. Gas generates 11 TWh per year in Australia’s National Electricity Market (only 5% of total gen). Capacity factor is low, but prices are high when operating. Snowy 2.0 has storage volume of 350 GWh (= 7,000,000 EV batteries) which is 85% of all Australian storage. Its capital cost ($34/kWh, 100-year lifetime) is 10X below batteries. On most days it could play with 5-10% of its water to displace overnight gas. Occasionally it can fully discharge over a wet & windless week when prices go high, and capture this lucrative gas market also. Theoretically, if operated 24/7 (pumping & generating), Snowy 2.0 could displace about two thirds of current gas generation. It will usually recharge when prices are low or negative. Building several more Class AA pumped hydro systems allows pumped hydro & batteries to eliminate gas from the NEM. There are 300 Class AA sites (size 50-500 GWh each) in southeast Australia. The image is a 500 GWh Class AA site near Araluen in NSW.

Laser power beaming is a form of wireless energy transfer where electrical power is converted into a highly collimated laser beam, transmitted over a distance, and then converted back into electricity at the receiving end using photovoltaic (PV) cells or similar devices. This approach enables the delivery of significant power densities over long distances with minimal beam spread, making it suitable for applications where traditional wired power delivery is impractical or impossible. # Key Features and Advantages: High Power Density: Laser beams can deliver much higher power densities than solar radiation, allowing for much smaller receiver panels. For example, a laser system can provide the same 500 W of power with a receiver area as small as 0.02 m², compared to about 2 m² for solar panels. Precision and Portability: The narrow, focused nature of laser beams allows for compact transmitter and receiver setups, which is beneficial for powering remote equipment, space missions, and mobile platforms like drones or lunar rovers. Versatility: Laser power beaming can be used in various environments, including ground-to-ground, ground-to-air, and even space-to-ground scenarios. # Applications: Space Exploration: Used for powering equipment in shadowed lunar craters or on Mars, where sunlight is insufficient or unavailable. Defense and Security: Enables persistent power supply to unmanned aerial vehicles (UAVs), sensors, and forward bases without relying on heavy batteries or vulnerable supply lines. Commercial and Industrial: Potential for powering remote communication relays, underwater vehicles, or providing emergency power after disasters. # Technical Considerations: Conversion Efficiencies: Modern laser systems can achieve electrical-to-optical conversion efficiencies up to 85%, with typical semiconductor diode lasers around 50%. Photovoltaic receivers can convert monochromatic laser light back to electricity at efficiencies over 50%. Atmospheric Effects: Laser beams can be affected by atmospheric conditions, such as fog, dust, or precipitation, which can reduce transmission efficiency. Safety: Decades of research indicate that power beaming via lasers can be safe, but precautions are necessary to avoid accidental exposure to high-intensity beams. # Recent Milestones: Distance Records: DARPA recently demonstrated delivery of over 800 watts of power via laser over a distance of 8.6 kilometers (5.3 miles) Commercial Development: Companies like PowerLight Technologies have demonstrated laser power beaming over 1 kilometer and are developing commercial solutions for UAVs and other platforms. Laser power beaming continues to advance, with ongoing research focused on improving efficiency, reliability, and practical deployment for both terrestrial and space-based applications.

Publicly Accessible Energy Storage Systems (ESS) Simulation Price-taker models are suitable for small-scale ESS as their capacity does not influence market prices or system dispatch. This post highlights DOE price-taker valuation tools. 🟦 1) QuESt  QuESt is a free, open-source Python application suite for energy storage simulation and analysis, developed at Sandia National Laboratories. It includes three interconnected applications:  1- QuESt Data Manager,  2-QuESt Valuation, and  3-QuESt BTM, Eligible technologies include BESS (Li-ion, advanced lead-acid, vanadium redox), flywheels, and PV, using a shared model for different BESS and flywheel types based on their parameters. 🟦 2) Renewable Energy Integration and Optimization (REoptTM)  The REopt™ platform, developed by the National Renewable Energy Laboratory (NREL), optimizes energy systems for various applications, recommending the best mix of renewable energy, conventional generation, and energy storage to achieve cost savings, resilience, and performance goals. Eligible technologies include: PV, wind, CHP, electric and thermal energy storage, absorption chillers, and existing heating and cooling systems. 🟦 3) Distributed Energy Resources Customer Adoption Model (DER-CAM)  DER-CAM is a decision support tool from Lawrence Berkeley National Laboratory (LBNL) designed to optimize DER investments for buildings and multienergy microgrids. Eligible technologies include conventional generators, CHP units, wind and solar PV, solar thermal, batteries, electric vehicles, thermal storage, heat pumps, and central heating and cooling systems. 🟦 4) System Advisor Model (SAM) SAM is a techno-economic computer model that evaluates the performance and financial viability of renewable energy projects. It includes performance models for various systems such as PV (with optional battery storage), concentrating solar power, solar water heating, wind, geothermal, and biomass, and a generic model for comparison with conventional systems. Eligible technology types focus on electrochemical ESS, supporting lead-acid, Li-ion, vanadium redox flow, and all iron flow batteries. Users can also model custom battery types by specifying their voltage, current, and capacity. SAM offers detailed modelling of battery cells, power converters, and factors like degradation, voltage variation, and thermal properties. 🟦 5) Energy Storage Evaluation Tool (ESETTM) ESETTM is a suite of modules developed at PNNL that allows utilities, regulators, and researchers to model and evaluate various ESSs. ESETTM features a modular design for ease of use and currently includes five modules for different ESS types, such as BESSs, pumped-storage hydropower, hydrogen energy storage, storage-enabled microgrids, and virtual batteries. Some applications also include distributed generators and photovoltaics (PV). Source: see post image. Link to the modellers: in the comment section This post is for educational purposes only.

Shifting to solar energy in commercial settings is not just an economic choice but reflects a deeper commitment to future-proofing operations and aligning corporate values with global sustainability trends increasingly valued by consumers. Implementing solar power solutions in businesses requires strategic considerations, such as evaluating rooftop or land space to optimize installations and analyzing local sunlight conditions to maximize efficiency. Beyond the technical aspects, organizations often leverage financial incentives, including tax credits or government subsidies, significantly reducing upfront costs and enhancing return on investment. Integrating battery storage systems complements solar installations, enabling businesses to store excess power generated during peak sunlight hours for continuous energy supply during low production periods or outages. Adopting solar energy can thus substantially decrease operational expenses, minimize environmental impact, and strengthen brand reputation. #SolarEnergy #Sustainability #RenewableEnergy #EnergyEfficiency #DigitalTransformation

Hourly matched renewable tariffs have grown x4 in the past year - evidence business customers are changing how they procure energy. This is translating into action from non-domestic energy suppliers. A new Granular Energy survey showed that of 75 suppliers surveyed, 69% were now offering or planning to launch products that aligned renewable generation with actual consumption hour by hour. A key driver is regulatory, with proposed changes to the GHG Protocol meaning hourly matching for emissions calculations in future. This all favours contracts that combine renewables with batteries, or mix different technologies together. These can deliver power when it's scarce and valuable - e.g. evenings and winter - rather than flooding the market at midday when solar has already saturated supply. B2B energy suppliers who develop hourly matching products now position themselves well. In doing so, there's a market dynamic they will need to be aware of for customers with 24/7 demand, e.g. data centres. Here, the nature of this demand will likely create new dynamics - a two-tier certificate market where power delivered at 3am on a January evening is likely to be worth far more than midday summer solar. Suppliers who can package renewables, storage and flexible contracts to cover the difficult hours will be better positioned to win such accounts. Link to the survey in the comments. BFY Group Hannah Sword

Big news out of Vermont today! A group of state leaders, including Senator Anne Watson and Representative Kathleen James, just launched a campaign to bring plug-in solar to Vermonters. If successful, Vermont will become the second state in the country — right after Utah — to open the door for renters, condo owners, and homeowners without good rooftops to generate their own power by simply plugging in a solar panel. Here’s why this matters: 🔌 Energy affordability — A base level plug-in solar panel can save the average Vermonter about $133 a year. And that’s just the starting point. With larger systems and batteries, families can save even more — stacking up hundreds of dollars over time while insulating themselves from rising rates. The fact that these systems pay for themselves in just about four years, without subsidies, makes them one of the fastest paybacks in clean energy. 🏠 Accessibility of solar — Right now, rooftop solar is out of reach for most. Nationally, fewer than 20% of households can install it because they rent, live in condos, or have roofs that don’t work for solar. Plug-in solar flips that equation: a renter in an apartment with a balcony can participate just as easily as a homeowner. In Europe, millions of households already use these systems for exactly this reason. ⚡ Deregulation — The biggest barrier isn’t technology. It’s outdated red tape. Today, plugging in a certified solar panel into your home can trigger the same permitting and interconnection rules designed for big rooftop systems. That’s like requiring a driver’s license and car registration just to ride a bike. Updating the rules to reflect reality is common sense. I’ve been in rooms with people who light up when they first hear about plug-in solar. Renters. Retirees. Families squeezed by high bills. They all ask the same thing: “Why isn’t this allowed yet?” That’s why today is a historic step. Vermont’s campaign shows growing momentum for a national movement to put power directly in people’s hands. I’m proud to be working alongside Senator Anne Watson, Representative Kathleen James, and partners like VPIRG, Ben Edgerly Walsh, Stephen W. Dotson and so many local energy leaders. Grateful for their collaboration in making sure Vermonters can take power into their own hands. Thanks to all the people at Bright Saver for working tirelessly to make this happen - Rupert Mayer for flying to Vermont to speak at the event today, Cora Stryker for all her work educating policy makers, Lisa Chan for media and comms, Wesley Schrock for business development, Kristy Leong for marketing, Rajesh Jambotkar on product, Sam Khaikin on our paper, Coleen Chase on community, and Mark McCarthy for hitting the ground running! 👉 What states — and what leaders — do you think we should work with next? (I’ll post the full press release link in the comments.)

Imagine lighting your home with seawater. 🌊💡 Not cables. Not diesel. Not waiting for the sun. In remote coastal regions of Colombia, a startup called E-Dina has developed something called WaterLight, a lamp powered by saltwater. Here’s how it works: 🌊 Half a litre of seawater ⚙️ Magnesium + copper plates inside ⚡ Ionisation creates electricity instantly 💡 Up to 45 days of continuous light No panels. No fuel deliveries. No grid connection. And it does more than just light a room. 🔌 Built-in USB port 📱 Charges phones and radios 📚 Enables children to study at night 🚨 Supports communication in emergencies That’s not just clever tech. That’s life-changing infrastructure. What I love most about this project is that it was designed with the local Wayúu communities in mind. 🪵 Waterproof wooden casing 🧵 Handwoven straps 🎣 Built for night fishing and real daily life It’s culturally rooted. Practical. Recyclable. And delivers around 5,600 hours of energy over its lifetime. This is the bit that matters to me: Real innovation doesn’t always mean high complexity. Sometimes it’s just using what’s already abundant. In this case, seawater. We talk a lot about energy transition in boardrooms. Meanwhile, some of the smartest solutions are happening in remote villages. Simple. Accessible. Zero-emission. Doing good, properly. What natural resource near you is still being overlooked? 🌍 ♻️ Repost to help your network.