See even if in power of attorney it is written it is irrevocable then also principal can revoke it and also the duration and validity of power of attorney is written In power of attorney. 

Also power of power of attorney is revoked on death of principal.

It should be mention in SPA that it is irrevocable. Since this is for specific purpose, once done will automatically expire.

Power of attorney can be revoked by the principal 

2) POA if coupled with consideration cannot be revoked 

Dear Client,

Power of attorney is revocable if the principal reserves the right to revoke the power at any time. Once the principal revokes the power, the agent can no longer act on the principal's behalf.

But power of attorney can be made irrevocable if the document includes a provision that specifically states that the principal gives up the right of revocation or otherwise indicates that the power is irrevocable.

As a practical matter, an irrevocable power of attorney is rarely used and is typically limited to a specific purpose.

-  Special Power of Attorney is revocable like any other contract .

- Be sure that there is no any termination /cancellation clause in the SPA .

- Try to registered the SPA, because if your SPA will be registered, then for the cancellation the executor/Principal will have to registered a Deed of Cancellation , after informing you for the same.

- Further , SPA can be made irrevocable if it is given with due consideration and if it specifically mentions that it is irrevocable. 

Good Luck and dont forget to rating Positively

It should be drafted as irrevocable power.

If the same is an revocable power of attorney then it can be revoked. If revocable then not

A clause to this effect that this poa is irrevocable must be embodied in the Poa to make this irrevocable.

Irrevocable poa can be cancelled under exceptional circumstances by giving paper publication only. 

Hi

The purpose of SPA is to do a certain act / activity on behalf of principal.  

It is issued for a limited purpose and its scope is also limited.

You cannot do any thing to have SPA for eternity.

The revocability of the agency depends on the interest of the agent he has in the agency so created.

In other words gratuitous agency can be revoked by the Principal at any point of time whereas the agency coupled with interest can not be revoked by the Principal at his whims or fancy.

You have to draft SPOA in this sense that it will be life long and not for limited period and limitations subject matter.

1. It depenbds on the subject matter of the said power of attorney.

2. If it has been executed after taking consideration for some commercial or personal purpose which has been mentioned in the said SPA, then it will be considered as irrevocable unless agreed by both the parties concerned.

You can cancel the special power of attorney by sending a cancellation notice to the holder of power of attorney and making a cancellation agreement.

You can add a clause for making the power of attorney irrevocable.

an irrevocable power of attorney can be revoked in some situations. If the agent or attorney-in-fact is abusing his position by acting in a manner contrary to the best interests of the principal, a court action can be filed to revoke the power.

The special power of attorney deed is executed for a special purpose only and it will stand cancelled or revoked automatically after the task is completed.

However if the principal wants to cancel the same even before it, he can very well do it by giving a notice to the power of attorney holder.

A power of attorney can be made irrevocable if the document includes a provision that specifically states that the principal gives up the right of revocation or otherwise indicates that the power is irrevocable. As a practical matter, an irrevocable power of attorney is rarely used and is typically limited to a specific purpose.

Any power of attorney, whether general or special, can be legally revoked (cancelled) at any time during the lifetime of the principal (the person who executes the PoA).