By Sarah Lozanova
The average cost of electricity from wind and solar energy could drop by 26 to 59 percent, according to a new report released by the International Renewable Energy Agency (IRENA). The report, entitled The Power to Change: Solar and Wind Cost Reduction Potential to 2025, finds policy framework and the regulatory environment to be key unknown factors in the future cost of electricity from wind and solar energy.
The report explores the global weighted average levelized cost of electricity (LCOE) of different forms of renewable energy today and in the near future. The LCOE of solar photovoltaic (PV) for example fell by 58 percent from 2010 to 2015, making it more competitive at the utility scale. The estimated LCOE in 2025 is expected to be a mere 6 cents per kilowatt-hour for solar PV and 5 cents for onshore wind energy.
Although concentrating solar power (CSP) and offshore wind energy are “in their deployment infancy,” falling costs have already made them attractive in some markets with an LCOE of 15 cents and 18 cents per kWh respectively, IRENA found.
By Sarah Lozanova
Greater energy independence, freedom from fluctuating energy prices, and environmentally friendly living are alluring concepts that motivated my family to examine our housing and our lifestyle. We recently purchased a high-performance home and installed a solar system, making our home net-zero. We now produce as much power as we use over the course of a year.
Realizing the Dream of a Net-Zero HomeTo realize the dream of a net-zero home, we bought a superefficient home atBelfast Cohousing & Ecovillage, a 36-unit multigenerational community in Midcoast Maine with triple-pane windows and doors, virtually airtight construction, a solar orientation and lots of insulation. The sun, appliances and occupants provide a majority of the heat needed to keep our home cozy.
On sunny winter days, our heaters remain off, as the sun gradually warms the house. Electric baseboard heaters kick on as needed, primarily at night or on cold, cloudy days. The home is all electric—with an electric range, hot water heaters and space heaters. Because we don’t use propane, natural gas or heating oil, a solar system can produce all the energy that our home consumes.
By Sarah Lozanova
As the US economy improves, the size of most new homes continues to expand. The average new home is now more than 2,600 square feet, compared to less than 1,000 square feet in 1950. Keep in mind that the average family size has shrunk considerably in recent decades.
This highlights a cultural shift, as many Americans are giving each child their own bedroom, and bathrooms are becoming more plentiful, sophisticated and spacious. Many families buy the largest house they can afford, which is encouraged by low interest rates. It is common for families to pay 1/3 to 1/2 of their income on housing. As homes become larger, the environmental impact typically expands as well, as more resources are needed to construct, maintain, heat, cool, and furnish them. Is there a green living alternative?
There has been a green living, tiny house and small house movement underway since the 1970s driven by environmental, financial, and time concerns related to the ever expanding American dream house. Tiny homes are typically less than 400 square feet, while small homes are usually under 1,000.
Some of my friends and family raised an eyebrow when I announced that my family of four (with a son and daughter) were to live in a new two-bedroom, 900-square-foot home in Belfast Cohousing & Ecovillage (BC&E)—a multi-generational community and ecovillage in Midcoast Maine, located 2½ miles from the town center and the Penobscot Bay.
By Sarah Lozanova
The U.S. has enough installed solar energy capacity to power 4.6 million homes. Solar energy accounted for 32 percent of total new power generation in 2014, exceeding coal and wind energy but lagging behind natural gas. In just nine years, the installed cost of solar energy has fallen by more than 73 percent – setting up the industry for explosive growth.
TriplePundit spoke with Vikram Aggarwal, founder and CEO of EnergySage, the so-called “Expedia of solar,” about solar energy trends and what to expect for 2016 in the residential market.
1. Unprecedented boom continues
Last year, analysts predicted that solar would grow by 57.4 gigawatts in 2015. The recent five-year extension of the investment tax credit (ITC) in the U.S. for both residential and commercial installations further enhances the growth trend. Now that solar manufacturing capacity has expanded significantly, the price of solar equipment has plummeted – making solar energy cheaper than grid-supplied power in many markets.
“The residential solar market is a vibrant $7 billion industry, and on track to generate more revenue by year-end 2016 than Major League Baseball,” Aggarwal said. “The economics of solar are rapidly changing for solar shoppers, installers and financiers alike.”
By Sarah Lozanova
Most of us think of solar energy as consisting of photovoltaic solar panels, which make up 95 percent of the solar energy market. Solar towers, however, are proving to be a promising technology for commercial-scale installations as well.
Construction is now underway on the Ashalim Thermal Solar Power Station, where a vacant stretch of the Negev desert in Israel will be home to a 787-foot solar tower.
This is a big step in achieving Israel’s goal to source 10 percent of its energy from renewables by 2020. The solar tower will produce enough electricity to power 121,000 Israeli homes, or meet 1 percent of Israel’s total electricity needs. Although the project is privately funded, the Israeli government has agreed to buy the power at above-market prices. Construction is expected to conclude late next year.
Google is leading the clean-energy revolution like no other company. It has invested in 22 renewable energy projects to date. In fact, Google is the biggest corporate purchaser globally of renewable energy, with a hand in utility-scale wind and solar projects that span the globe. Google has a goal to power 100 percent of its operations from renewable energy, and it is well on its way.
“We’re really trying to lead this transition to a cleaner energy economy,” said Michael Terrell, principal for energy and infrastructure at Google. “It’s transforming anyone who touches the energy space. It’s not just about data centers or tech companies.”
The Google approach to renewable energy is not unlike how many utilities purchase power. It often enters into power purchase agreements: long-term financial agreements, typically with wind farms, to buy power. The projects that Google has been involved with span the globe, including in Sweden, Iowa, Oklahoma and California, along with a recent $12 million investment in the largest solar energy project in South Africa.
by Sarah Lozanova
Installed solar energy capacity in the U.S. is growing dramatically, with numerous record-shattering years in a row. There is now enough installed solar energy to power over 4.6 million U.S. homes and a new solar project is installed every two minutes. Meanwhile, the cost of solar has fallen significantly, helping to fuel this unprecedented growth.
Solar energy (r)evolution
Since 1998, the cost of residential and commercial solar photovoltaic (PV) systems has fallen every year by an average of 6 to 8 percent, according to the National Renewable Energy Laboratory. Since 2006, the installed cost of solar energy has dropped more than 73%. Once a market dominated by environmental motives, many people are now installing solar PV to save money.
By Sarah Lozanova
Our homes can be comfortable and energy-efficient: Especially if we borrow from the high-performing, effective ideas used around the world in “passive houses.” Developed by the German Passivhaus Institut in 1996, a Passivhaus is defined by core efficiency standards. What does this mean in practice? Homes built to the Passive House standard are extremely comfortable to live in—with natural daylighting, even temperatures throughout and virtually no drafts.
Passive homes require 90 percent less energy to heat because energy losses are minimized with generous amounts of insulation and air sealing. The homes are heated largely by solar heat gains and internal gains from people and electrical equipment. Although fully retrofitting a home to the passive house standard is usually very costly, we can use many of the elements of passive home design to make our homes more efficient. Apply the following concepts to your home to boost comfort and reduce energy bills.
Boost Winter Solar GainSouth-facing windows and, to a lesser extent, east- and west-facing windows help gradually warm our homes with solar energy. Maximizing this free energy source reduces dependence on heating systems, in turn lowering utility bills in cold climates and promoting indoor air quality. Forced air heating, for example, can carry dust with the heat as it passes through duct work, while wood-burning stoves and heating systems that use natural gas or propane can emit carbon monoxide. Wood-burning stoves also can produce breathable pollutants such as smoke and ash.
Clean southern windows and remove screens. When the heating season begins, remove screens on south- and east-facing windows and wash the windows to increase your solar gains by up to 40 percent. Keep screens in the west- and north-facing windows to provide protection from the winter wind.
Avoid shading southern windows in the winter. Evergreen vegetation, carports and porches can shade southern windows, hindering solar gains. In colder climates, plant only deciduous trees and shrubs (which lose their leaves in winter) outside south-facing windows, or space vegetation and structures far enough away from the house to avoid shading southern windows.
Expand with a solar addition. If you are planning an addition on your home, consider adding a sunroom, which can help heat your home. Effective sunrooms face south, include lots of thermal mass, are thoroughly insulated, and include ventilation options with windows, doors and skylights.
Freelance clean energy writer