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:

The 50 Most Innovative New Renewable Energy Companies

To make our list, your company had to be, first and foremost, innovative. Your company needed an innovative product, technology, or process to even have been considered for our rundown.

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.

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.

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.

UL to launch accelerated thermal evaluation service at CWIEME Berlin

Safety test provider Underwriters Laboratories (UL) is launching a shorter 50-day electrical insulation system test program for electric motors at the forthcoming CWIEME Berlin exhibition. This service responds to global demand from manufacturers for help getting products to market quicker without compromising on safety.

New winding technology boosts motor efficiency

As the world braces for ever more stringent regulations aimed at curbing carbon emissions, a new winding techlogy promises to both increase motor efficiency and its power factor while using a surprisingly cost-effective method.

HEV/EV industry growth sparks leap in magnet wire performance

As the market for hybrid-electric and electric vehicles has grown, so too has the demand for ever-higher performing magnet wires. Suppliers, such as Superior Essex, are gearing up their R&D operations and launching new products tailored to this increasingly important customer base.

ABB FACTS solution to help maintain grid stability for TVA as power generation mix changes

Tennessee Valley Authority (TVA), the largest public utility in the US, is installing ABB's static var compensator (SVC) technology to help ensure system reliability as fossil fuel component of total energy mix declines. SVC's enhance grid stabilization and at the same time enable a smarter grid.

New Reports: India is Open for Clean Energy Business

NRDC & Partners Show How Innovative Green Banks and Bonds Can Provide Major Boost and Help India Achieve its Ambitious Renewable Energy and Climate Goals

WOMEN OF WIND ENERGY RELAUNCHES HOUSTON CHAPTER

After a couple of years of hiatus the chapter is under new enthusiastic leadership. Spearheaded by new Chapter Leader, Elizabeth Kaiga (Director, Renewable Energy at CohnReznick) the chapter has begun programming with the support of an all new chapter team.

IREC's 3iAwards Annual Search to Recognize Best in Nation Innovation. Ingenuity. Inspiration.

The IREC 3iAwards honor innovation, ingenuity and inspiration from the nation's best in both renewable energy and energy efficiency.

Global Clean Energy on tract to close PGM Acquisition by early June 2016 FIRST QUARTER UPDATE

With a compelling pipeline of market opportunities presently existing in the United States, the Company is finalizing multiple agreements in prime US markets with major waste plastics and waste tire suppliers to acquire the rights to install pyrolysis systems on their facilities, which allow for the waste plastics and tires to be converted into alternative, low emission fuels such as diesel, and syngas, on their facilities.

Ballard Fuel Cells Power Tangshan Railway Vehicle Co. Hybrid Urban Tram in China

Ballard's FCveloCity®-HD fuel cell module has successfully powered another urban tram, this one designed and built by Tangshan Railway Vehicle Co. Ltd. (TRC) in China's Hebei Province.

AMERICA'S MILLIONTH SOLAR INSTALLATION TO BE CELEBRATED IN WASHINGTON, D.C.

Government leaders, solar industry, customers to gather for milestone event

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Sierra Instruments, Inc.- InnovaMass. Reinvented.

Sierra Instruments, Inc.- InnovaMass. Reinvented.

Sierra was the first to introduce a combination volumetric vortex and multivariable mass flow meter in 1997. Today, Sierra's completely redesigned InnovaMass® iSeries™ 240i/241i builds on two decades of success measuring five process variables for gas, liquid and steam with one connection. Now, with the latest hyper-fast microprocessors, robust software applications, field diagnostic and adjustment capability, and a new state-of-the-art flow calibration facility, Sierra's vortex iSeries delivers precision, performance, and application flexibility never before possible.