Fighting the last war: Study finds solar + storage uneconomic now  | from Utility Dive

“A Rochester Institute of Technology study says a customer must face high electricity bills and unfavorable net metering or feed-in policies for grid defection to work.”

Yet…this study used current battery costs (at $350/KW-Hr), ignoring probably cost decreases, and then made more restrictive assumptions about how such a system might work. It’s not clear if “defection” meant complete self sufficiency, or reducing the generation portion (which in California about half of electricity bill.) Regardless, the study shows that grid defection is cost-effective in Hawaii, confirm the RMI findings. Even so, RMI said it would take at least 10 years before such defection was cost-effective in even the high-cost states like New York and California.

A more interesting study would be to look at the “break-even” cost thresholds for solar panels and batteries to make these competitive with utility service. Then planners and decision makers could assess the likelihood of reaching those levels within a range of time periods.

Source: A study throws cold water on residential solar-plus-storage economics | Utility Dive

Utilities vote to close 2,250 MW Navajo plant, largest coal generator in western US | Utility Dive

Competition from cheap natural gas generation is again the reason behind the second major coal closure announcement in a month.

Source: Utilities vote to close 2,250 MW Navajo plant, largest coal generator in western US | Utility Dive

Problems with “Residential storage can undercut benefits of rooftop solar, says new study” | (A response to a Utility Dive article)

A new study in Nature Energy finds storing rooftop solar can increase emissions and energy consumption.

My thoughts: Here’s the key statement for the finding in this report: “based on today’s Texas grid mix, which is primarily made up of fossil fuels.” If the either the marginal generation on the grid is low or no GHG (e.g., renewables overgeneration which is an increasing problem in California) or the connection to the grid is cut or restricted (e.g., in a microgrid), then this premise doesn’t hold.

This study relies on fossil fueled generation being the marginal energy source. It also focuses solely on operational changes with existing resources. The appropriate frame is looking at the change in generation investment with and without storage, so for example more renewables become cost effective with storage so the overall generation mix changes.

The second problem is that most of the production cost models are yet incapable of capturing reduction in flexible capacity use. That’s why the California Energy Commission has had DNV and LBNL working on modeling those resources. So the emission savings are underestimated.

The third problem is that savings in residual unit commitment (RUC) is underestimated in the models. These are gas units running on standby with no-load, to be available the next day for ramping, load following or reliability. Storage reduces the need for these resources as well. NREL recently released a study on the value of storage that captures this benefit.

If these findings are valid, then the existing Helms pumped storage plant is also increasing GHG emissions. One could go so far as to say that the value of pondage hydropower storage may be so diminished that relicensing conditions that require run of river operations may have little effect on costs and GHG emissions.

Source: Residential storage can undercut benefits of rooftop solar, says new study | Utility Dive

Repost: Wind capacity blows past hydro to become most plentiful US renewable | Utility Dive

Installed wind capacity is more than 82,000 MW, according to a trade group, making it the nation’s largest renewable resource ahead of hydro.

Source: Wind capacity blows past hydro to become most plentiful US renewable | Utility Dive

And then this…Trump’s energy plan doesn’t mention solar – The Washington Post

After the release of a study showing solar now employs more than oil, gas and coal combined.

Source: Trump’s energy plan doesn’t mention solar, an industry that just added 51,000 jobs – The Washington Post