Options for storing wind and solar energy go beyond batteries
When oil and natural gas executives were not begging investors for more money, many touted their plans to produce various colors of hydrogen atHydrogen is the lightest element, highly flammable, odorless and colorless. When energy executives talk about hydrogen’s color, ranging from gray to green, they are referring to how sustainably it’s derived.Gray hydrogen is made from natural gas and produces large amounts of carbon dioxide.
“When we looked at the market, what was very clear to us was that in certain geographies there was an imminent need for long-duration storage, in California, the Western part of the United States in particular where renewable penetration is about 35 percent,” said Arun Mitra, executive vice president and chief financial officer at Mitsubishi Power Americas. “There’s a clear need for shifting generation capacity from the spring to the summer season.”.
What makes sense for the western U.S. electric grid will not work everywhere. Mitra and other experts agree that in Texas, North Dakota, and other places with cheap natural gas and old oil wells that can store CO2, blue and turquoise hydrogen make more sense.. The proposal would expand existing facilities that use natural gas to make hydrogen, sequester the CO2 in old offshore wells, and export hydrogen from the Houston Ship Channel.
Transporting and storing hydrogen is not easy. However, natural gas pipelines can carry hydrogen gas with some modifications, and companies can supercool it into a liquid, just like liquefied natural gas.
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