The words premiums has different meanings, but the one you are looking for is: something offered free or at a reduced price as an inducement to buy something else.

Wind Energy: A Short Guide to Subsidies and Incentives www.thesolarguide.com/...power/incentives.aspxEn caché - Similares - Traducir esta página
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There are many subsidies and incentives provided to encourage the adoption of wind power. Learn here how you can benefit from them.
13.2.1.5 Subsidies and incentives - AR4 WGIII Chapter 13: Policies ... www.ipcc.ch/publications.../ch13s13-2-1-5.htmlEn caché - Traducir esta página
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13.2.1.5 Subsidies and incentives. < · > ... the diffusion of new technologies, such as those for renewables or nuclear power, may promote emissions reductions.
Government Subsidies-Finance | Mass Megawatts Wind Power, Inc ... www.massmegawatts.com/government-subsidies-...En caché - Traducir esta página
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The Federal government has set an ambitious goal of '20% wind power by 2030 ... This newly enhanced array of Federal and State subsidies and incentives has ...
REPP - Research Reports - WINNER, LOSER OR INNOCENT ... www.repp.org/repp_pubs/.../mcveigh2.htmlEn caché - Traducir esta página
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Similar considerations apply to our exclusion of nuclear power, whose underlying ... including the treatment of subsidies and incentives for the development of ...

I'm just adding this entry late as I'm currently working on a document that goes into a lot of depth about these terms. Edward is right, it's an incentive, but the industry seems to call them bonuses or premiums, although in fact they are really subsidies. Perhaps a bit of political "maquillaje" going on there, as the word "subsidy" can be a bit contentious.

The "prima" is NOT the feed-in tariff, but it can be a a part of it, look:

Con el propósito de lograr los objetivos marcados por la UE, el Gobierno Español aprobó el Real Decreto 661/2007, por el que se reguló la actividad de producción de energía eléctrica en régimen especial. En España se optó por el sistema Feed-In Tariff (FIT), que consistía en que los productores de electricidad de origen renovable vendían su producción a un precio fijo (tarifa regulada) o al precio del mercado eléctrico (pool) más una prima o incentivo.
http://www.eoi.es/blogs/pabloocampo/2013/11/19/la-tarifa-ele...

-¿Por qué son necesarias las primas?

Las primas son unos incentivos nacidos en España en los años noventa con el objetivo de fomentar el desarrollo de las energías autóctonas y limpias (renovables) en vez de penalizar a las más contaminantes. Para ello se estableció el Régimen Especial del sector eléctrico, donde estaban integradas todas las tecnologías que se querían fomentar.
...
-¿Por qué aumentan las primas el déficit de tarifa?

Las primas no son cantidades fijas: se cobra más prima cuánto más bajos están los precios de la energía y viceversa.

Las primas son un coste más del sistema, por lo que sólo engordan el déficit si las previsiones del Gobierno sobre lo que van a suponer son inferiores a su coste real.
http://www.aeeolica.org/es/sobre-la-eolica/preguntas-frecuen...

In the reference below, it refers to bonuses, which are what is meant when we talk about "primas".

How do the Feed-In Tariffs help?
The Tariffs give three financial benefits:

A payment for all the electricity you produce, even if you use it yourself
Additional bonus payments for electricity you export into the grid
A reduction on your standard electricity bill, from using energy you produce yourself
http://www.fitariffs.co.uk/FITs/

Here's a clearer example of how it's used:
In Spain, wind farms can, at the start of each year, choose between two tariff regimes: (i) a FIT, currently 6.21 eurocents, which is changed each year; (ii) to receive a “prima” per kWh, at a rate adapted each year, and sell their power into the power exchange receiving the daily market price.

Denmark decided in 1999/2000 to drop the FIT for new wind farms, replacing it with a tradable RE certificate scheme to begin in 2001. Existing wind turbines were to be paid the FIT until 2010, a decision which proved to be the kiss of death for the green certificate scheme: it reduced the annual volumes for traded RECs to insignificant levels, creating a market with too low liquidity to make it efficient. The REC was never implemented. Instead, as shown in the next chapter, Denmark introduced a variant of the “premium payment on top of market pool price” scheme.
http://siteresources.worldbank.org/EXTRENENERGYTK/Resources/...

By the way, feed-in tariff appears to be translated in Spain as "tarifa regulada", although some sources refer to it as the "regimen especial", which I would translate as "feed-in tariff scheme [or system]".

ES Spanish Industry and Energy Ministry. Spanish power plants. Distinguishes between ordinary power plants and those under the feed-in-tariff scheme (“regimen especial”).
http://open-power-system-data.org/data-sources