Resignation of Grant Thornton LLP

On December 20, 2016, Grant Thornton LLP (Grant Thornton)
resigned as the independent registered public accounting firm for
P10 Industries, Inc. (formerly Active Power, Inc.), a Delaware
corporation (the Company).

Grant Thornton reported on the Companys financial statements for
each of the years ended December 31, 2014 and 2015. These reports
did not contain any adverse opinion or disclaimer of opinion, nor
were they qualified or modified as to uncertainty, audit scope,
or accounting principles. During the two most recent fiscal years
and through December 20, 2016, there were no disagreements (as
defined in Item 304 of Regulation S-K) with Grant Thornton on any
matter of accounting principles or practices, financial statement
disclosure, or auditing scope or procedure, which disagreements,
if not resolved to the satisfaction of Grant Thornton, would have
caused it to make a reference to the subject matter of the
disagreement in connection with its reports. Further, during the
period of Grant Thorntons retention, there were no reportable
events (as defined in Item 304(a)(1)(v) of Regulation S-K).

The Company provided Grant Thornton with a copy of the foregoing
disclosures prior to filing this Current Report on Form 8-K. A
letter from Grant Thornton addressed to the Securities and
Exchange Commission stating that Grant Thornton agrees with such
disclosures is included as Exhibit 16.1 to this Current Report on
Form 8-K.

Engagement of PMB Helin Donovan, LLP

On December 22, 2016, the Company appointed PMB Helin Donovan,
LLP (PMB), an independent registered public accounting firm which
is registered with, and governed by the rules of, the Public
Company Accounting Oversight Board, as its independent registered
public accounting firm. During the two most recent fiscal years,
and through December 22, 2016, neither the Company nor anyone on
its behalf consulted with PMB regarding either (1) the
application of accounting principles to a specified transaction
regarding the Company, either completed or proposed, or the type
of audit opinion that might be rendered on the Companys financial
statements, and neither a written report nor oral advice was
provided to the Company that was an important factor considered
by the Company in reaching a decision as to the accounting,
auditing or financial reporting issue; or (2) any matter that was
either the subject of a disagreement (as defined in Item
304(a)(1)(iv) of Regulation S-K and related instructions to Item
304 of Regulation S-K) or a reportable event (as defined in Item
304(a)(1)(v) of Regulation S-K).

Section 9 Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits