G-7

Depiction of the most promising sulfur thermochemical cycles for water splitting,

214

G-8

Estimated thermal-to-hydrogen efficiency (η_H) of the sulfur-iodine (SI) process and thermal energy required to produce a kilogram of hydrogen from the modular high-temperature reactor-SI technology,

215

G-9

Electrolysis cell stack energy consumption as a function of cell stack current density,

220

G-10

Sensitivity of the cost of hydrogen from distributed electrolysis to the price of input electricity,

223

G-11

Wind generating capacity, 1981–2002, world and U.S. totals,

225

G-12

Hydrogen from wind power availability,

226

G-13

Efficiency of biological conversion of solar energy,

230

G-14

Geographic distribution of projected bioenergy crop plantings on all acres in 2008 in the production management scenario,

231

G-15

Best research cell efficiencies for multijunction concentrator, thin-film, crystalline silicon, and emerging photovoltaic technologies,

236