Solar power has been growing at a rapid pace in recent years.
According to figures from the U.S. Energy Information Administration, total installed capacity of all types of solar energy reached 1.1 gigawatts (GW) in 2015, which is nearly 10% of the country’s total installed power capacity.
That’s a jump of more than 2 GW from 2014 and almost a full GW more than the cumulative installed capacity for all types in 2015.
It’s also more than double the amount installed in 2014.
Solar power, in addition to providing cheap power to homes and businesses, has been a major contributor to the countrys economy.
Since 2009, the country has added more than $2 trillion in new jobs and $1 trillion in annual economic output to the U., according to the Economic Policy Institute, which tracks the economic impact of solar.
Even so, solar is still relatively expensive.
A kilowatt hour (kWh) of solar power is equal to a kilowatthour (kW), which is the amount of energy produced by one gram of matter.
A kWh of solar electricity is about the same as 1.5 million pounds of steel.
The average cost of solar in the U and Canada is $5 per kilowatts, while the average cost in Europe is about $1 per kWh.
The cost of installation varies depending on the location.
In the U, for example, the average installation cost for solar power plants is $1.7 billion per megawatt-hour.
In Canada, the cost is about double that.
For solar power to become cheaper and more widespread, however, there’s a need for better energy storage technology.
Utilities in the United States have been building battery-based storage systems since the mid-1990s.
Today, more than 75% of installed rooftop solar capacity is battery-backed, which means that the power generated by the solar panels comes from batteries.
As the technology matures, however- which has been the case since the early 2000s- there are a number of challenges associated with developing battery-powered systems.
Battery-backed solar panels tend to be quite bulky, and it’s not always clear how much energy the batteries can store.
A lot of energy can be lost in the process of charging the solar arrays.
Battery storage systems, for instance, can’t store enough energy to power a home for an extended period of time without losing some of the stored energy.
One challenge with battery-driven systems is that solar panels can’t easily store enough power to last the entire day.
Solar panels are also subject to the effects of solar storms.
An estimated 100 megawatts of solar PV power generated in the contiguous U., Canada, Mexico, the United Kingdom, and Spain were lost in a storm last year, according to Bloomberg New Energy Finance.
These types of storms, which typically occur on the equator during the summer, typically cause solar power stations to lose about 20% of their capacity in a short period of the year.
But these storms can also damage the solar power grid, which can result in outages or grid disruption for months or even years.
Battery-backed systems can, however at least partially solve these issues, according the Solar Energy Industries Association.
Tesla recently announced a new battery-enabled solar power system that will be able to store and use more than 200,000 kilowats per second.
There’s also the possibility of solar-powered trucks.
Currently, Tesla has plans to build a truck that can transport solar panels to and from solar farms, a project that would be funded by the company’s $5 billion battery-fueled energy storage initiative.
Tesla plans to have the truck ready by the end of 2018.
If Tesla’s truck works, then the technology could help improve the reliability of the grid in some ways.
Electricity prices can also fluctuate significantly during storms.
Solar energy production, in particular, tends to fall when the sun is shining.
And even during a solar storm, battery storage can still provide significant value to the grid.
“As solar power grows in popularity and the cost of storage increases, it’s important to keep an eye on these types of things,” said Jeff Jones, director of the Solar Foundation’s Solar Market Research Center.
“There is a lot of room for growth in storage in the industry.”