Solana's molten-salt thermal energy storage system is able to generate power at maximum capacity for six hours without solar radiation. ---- Solana is the first commercial plant in the United States to use this new thermal energy storage technology.

WASHINGTON, Oct. 2, 2014 -- Abengoa Yield (Nasdaq:ABY), the

sustainable total return company that owns a diversified portfolio of
contracted assets in the energy and environment sectors, has announced that
Solana, its Arizona-based solar power plant, received the Energy Storage
North America (ESNA) Innovation Award in the Utility-Scale category. Winners
were announced on October 1st, 2014, at the ESNA Innovation Awards ceremony
in San Jose, California.

Solana is the largest solar parabolic trough plant in the world.
Located near Gila Bend, Arizona, it has a total installed capacity of
280 megawatts. With a six-hour molten-salt thermal energy storage capacity,
it supplies clean energy to Arizona Public Service (APS), Arizona's largest
utility, meeting peaks of demand before dawn and after dusk.

Solar thermal energy storage with molten salt permits Solana to eliminate
intermittency issues, one of the greatest challenges that most renewables
must face. Storage also increases dispatchability in the power generation
process, creating systems which can operate flexibly both with and without
solar radiation.

The ESNA Innovation Awards recognize excellence in energy storage project
development. All project finalists were subject to a rigorous evaluation
process based on key industry priorities, including: project impact;
services supplied to the grid; financing model; ownership model; technology;
and safety.

Winners were chosen by the ESNA Advisory Board and votes on social media.
Public votes via Twitter accounted for 50 % of the final result.
Solana's project received 77 % of the votes submitted during the one-month
twitter campaign.

Solana's parabolic trough collectors track the sun and concentrate sunlight
onto receiver tubes located at a focal point of each collector. A heat
transfer fluid (HTF) is heated as it circulates inside the tubes and is then
circulated back to a central power plant.

The HTF then passes through a series of heat exchangers to produce
superheated steam that is used to generate clean electricity in a
conventional steam turbine generator. Delivering electricity to
approximately 70,000 households, Solana prevents the emission of
475,000 tons of CO? annually.