Battery Cost

Batteries for diurnal electric grid levelling are a Dumb Idea.

Battery Type

Cost per Wh

Wh/kg

Joules/g

Wh/liter

Lead-acid

$0.17

41

146

100

Lithium-ion

$0.47

128

460

230

Water, 1 km head

tiny

2.7

9.8

2.7

(from http://www.allaboutbatteries.com/Battery-Energy.html)

Norway has 84 TWh of reservoirs that can be converted to pumped hydro. Conversion would cost a dollar a watt - peaking 50 gigawatts would cost $50B. For long term storage, that is $0.0006 per Wh. The chart above does not give lifetimes, but reservoirs last a century, and batteries last from 1 to 5 years.

Batteries are good for portable devices, marginally so for data center emergency power (until the generator starts), execrably lousy for diurnal or seasonal grid load levelling. Reservoirs rarely catch fire, explode, or emit toxic chemicals.

BatteryCost (last edited 2015-05-23 19:47:07 by KeithLofstrom)