4.Property, Plant and Equipment

Property, plant and equipment (“PP&E”) is stated at cost, less accumulated depreciation. Depreciation is calculated on a straight-line basis over the estimated useful service life of the asset.

PP&E consists of the following:

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Asset Exchanges

During the nine months ended September 30, 2022, we completed multiple nonmonetary transactions. The transactions included exchanges of wells, facilities, permits and other assets. The total net book value of the divested assets and liabilities was $3.8 million. The acquired assets were recorded at a total fair value of $3.2 million, which resulted in a total pre-tax loss of $0.6 million.

Assets Sold

During the first quarter of 2022, management committed to a plan to sell certain of our assets located in the Midland Basin and determined that these assets met all the criteria for classification as assets held for sale. These assets were re-measured at their fair values less costs to sell, which resulted in the recognition of pre-tax impairment expense of $15.6 million during the first quarter of 2022. We estimated the fair value of the assets using indicative bids, which were representative of a Level 2 fair value measurement, and we ceased recording depreciation on the assets. During the third quarter of 2022, we closed the sale of these assets for proceeds of $7.4 million and recorded a gain of $0.1 million.

Abandoned Assets

In June 2022, management determined that two previously acquired saltwater disposal wells (“SWD wells”) were no longer economically beneficial to the operations of the Company due to required workover costs and determined that the SWD wells should be shut-in and taken out of service. Accordingly, we removed the cost and the associated accumulated depreciation and recognized a charge of $4.2 million for the remaining book value of the SWD wells. The charge has been reflected in abandoned well costs in the condensed consolidated statements of operations for the nine months ended September 30, 2022.

In late second quarter 2022, management removed the cost of a SWD well that was under construction in Texas. The well had encountered technical difficulties during the drilling phase and progress on the well was stopped. Management’s evaluation of the well determined that abandoning the asset was the most prudent course of action. Accordingly, we removed the cost of the asset and recognized a charge of $1.6 million, which is reflected in abandoned well costs in the condensed consolidated statements of operations for the nine months ended September 30, 2022.

In the third quarter of 2022, we recognized a charge of $9.2 million related to a stand-alone SWD well that has been taken out of service. The charge is reflected in abandoned well costs in the condensed consolidated statements of operations for the three and nine months ended September 30, 2022.

During the first nine months of 2021, we re-entered a SWD well bore to address anomalies. After technical testing, management concluded that it was probable that abandoning the asset was the most prudent course of action as the well was unable to remain in service in its current condition, and we recognized abandoned well cost of $27.4.

Delaware Energy Asset Acquisition

On August 1, 2022, we acquired from Delaware Energy, LLC certain saltwater gathering and disposal facilities, disposal wells and other related assets and rights in Lea County and Eddy County, New Mexico. In connection with the closing and as consideration for the assets, we issued to the seller 3,365,907 shares of our Class A common stock and included volumetric-based contingent consideration. We estimated the fair value of the contingent consideration using a discounted cash flow model based on estimated royalty

payments to be made over a five-year contractual period. Allocation of the purchase price to the acquired assets was based on relative fair values.

The following table sets forth our purchase price allocation.

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Contemporaneously with the issuance of such shares of Class A common stock, Solaris LLC issued 3,365,907 Solaris LLC units to Aris Inc.

Other Asset Acquisition

During the third quarter of 2022, we purchased five ponds from ConocoPhillips, a related party, for a cash purchase price of $3.4 million.