Solar power is contagious. These maps show how it spreads.

Brad Plumer for VOX:  Rooftop solar is expanding rapidly in the United States — by some estimates, a new system goes up every four minutes. There are plenty of reasons for that, from falling prices to generous federal subsidies to innovative leasing schemes.

But there's another, little-discussed factor here: Residential solar power is contagious. Yep, contagious. Studies have found that if you install solar photovoltaic panels on your roof, that increases the odds that your neighbors will install their own panels.

SolarCity, the largest solar installer in the United States, just published some fascinating data on this "contagion" effect. The company has installed 230,000 rooftop systems nationwide (often by allowing customers to lease panels rather than buy them upfront). It says fully one-third of customers were referred by a friend or neighbor.

SolarCity has also made some neat animations showing the "contagion" effect in action.  View here:

Marathon Capital Announces the Successful Sale of groSolar to EDF Renewable Energy

Together with groSolar, Marathon Capital developed materials to present groSolar's strategic business plan to the market. Marathon Capital then conducted a comprehensive process to explore financial and strategic investor interest in partnering with groSolar to further accelerate its growth in the distributed marketplace and was pleased to help facilitate the transaction between two strongly aligned players with a great strategic fit.

Connecticut Municipal Electric Energy Cooperative and SolarCity Install Solar and Energy Storage Portfolio in the Northeast

Projects totaling 13 megawatts of solar and 6 megawatt hours of storage, SolarCity's largest such installation in the Northeast, will provide clean, dispatchable power when needed most

SolarCity Launches Utility and Grid Services

SolarCity's new services include installation, financing, and consulting services for utility-scale solar and energy storage resource development, as well as advanced controls for demand response, distributed energy resources, and aggregated grid services.

China's Wind Power Installed Capacity Will Escalate to 495 GW by 2030, says GlobalData

• China's installed wind power capacity will more than treble from around 149 Gigawatts (GW) in 2015 to over 495 GW by 2030, at a compound annual growth rate of 9% • Supportive government policies that include an attractive concessional program and the availability of low-cost financing from government banks are the main reasons for market success, says analyst

PVinsights: Solar panel prices slump as global price competition intensifies

Solar panel prices extend losses this week, as Chinese module makers leverage price competition intensively over the globe, especially in the US. Amid waning demand in China, some Chinese module maker is rush to increase the shipment volume in rest of the world, particularly in the US, in order to be the dominant module manufacturer. Since the demand in the US is widely expected to be promising in the coming five years, Chinese module makers has been aiming the US as one of the major target market to penetrate with their overseas capacities. Hence, solar panel price in the US has encountered great pressures, as Chinese module makers fuel strategic pricing intensively in the region. Meanwhile, in China, SEA and India, the regional prices are under pressured as Chinese module makers also intend to leverage price competition to capture more market shares.

Solar Industry Gets Down to Business at the 2016 Midwest Solar Expo

The 3rd Annual Midwest Solar Expo is returning to the Twin Cities May 17-19, 2016 at the DoubleTree by Hilton St. Paul Downtown.

#MillionSolarStrong gains widespread support as 70+ organizations sign pro-solar declaration

Additionally, the hashtag reached nearly 77 million people through a thunderclap across the social media platforms Facebook and Twitter with even President Obama weighing in to give #MillionSolarStrong a social media shout out.

Ideal Power Introduces New Solar PV String Inverter

First Commercial Solar PV String Inverter With Field Upgradable Port for Direct Integration of Energy Storage Targeting $6.9 Billion Inverter Market

WindPower - Expanded 3M Wind Energy Generation Portfolio to be Showcased at AWEA

This year, 3M will highlight its expanded wind portfolio - from adhesives and sealants to personal protection equipment - at the American Wind Energy Association (AWEA) Show from May 23-26, in New Orleans.

Atlantic Wind & Solar Launches Swift Homes - Ultra Affordable Modular Housing

As part of the Company's recently announced Sustainable Living Initiative, Atlantic launched this prefab line of modular housing to provide an extremely low cost swift solution.

Gearbox Express Opens New Headquarters

The new headquarters for Gearbox Express, located in Mukwonago, WI.

INTERSOLAR AND EES ON COURSE FOR GROWTH AROUND THE WORLD

Positive global market development boosts success

How much noise is produced by wind turbines?

Phys.org:  Wind energy is to have a major share in the future renewable energy mix. The Germany-wide TremAc project is aimed at improving the planning, development, and acceptance of wind power plants and at developing objective criteria for their emissions. For this purpose, experts will study the interaction of acoustic and seismic vibrations of wind power plants and plan to generate a model to compute both emissions. TremAc is funded with EUR 1.85 million by the Federal Ministry for Economic Affairs and Energy.

"We want to compute the complete chain of effects from the plant to the population," Theodoros Triantafyllidis, coordinator of the TremAc cooperation project and Head of the Institute of Soil Mechanics and Rock Mechanics of KIT, explains. Within the framework of the TremAc cooperation project, a single chain is to be developed for modeling all vibrating plant components and the surroundings, i.e. the rotating rotor blades, drive shaft, gondola suspension and tower structure, foundation, and the ground, various topographic terrains and airflows as well as adjacent residential buildings and workplaces.

Axitec and Quick Mount PV meet highest standards in safety and quality to provide best-in-class modules and solar mounting systems to installers

Axitec and Quick Mount PV are pleased to announce that they've met UL 2703 Edition 1, the highest standards in safety and quality to provide best-in-class modules and solar mounting systems to meet the needs of today's installers.

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