Related Party Transactions	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Star Peak Energy Transition Corp [Member]
Related Party Transactions	Note 4—Related Party Transactions Founder Shares On November 8, 2018, the Sponsor purchased 2,875,000 shares (the “Founder Shares”) of the Company’s Class B common stock, par value $0.0001 per share, for an aggregate price of $25,000. On July 13, 2020, the Company effected a stock split resulting in the Sponsor holding 10,062,500 Founder Shares. All shares and the associated amounts have been retroactively restated to reflect the aforementioned stock split. On July 29, 2020, the Sponsor transferred 40,000 Founder Shares to each of Desirée Rogers and C. Park Shaper, the Company’s independent director nominees. The initial stockholders agreed to forfeit up to 1,312,500 Founder Shares to the extent that the over-allotment option is not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the outstanding shares after the Initial Public Offering. The underwriters partially exercised their over-allotment option on August 26, 2020, with the remaining portion of the over-allotment option expiring at the conclusion of the 45-day option period. As a result, an aggregate of 472,874 Founder Shares were forfeited upon the expiration of the over-allotment option. The Founder Shares automatically converted into common stock on a one-for-one basis at the time of the Merger and are subject to certain transfer restrictions, as described below. The initial stockholders have agreed, subject to limited exceptions, not to transfer, assign or sell any of their Founder Shares, or shares of common stock issued upon conversion there of, until the earlier to occur of: (A) one year after the completion of the initial Business Combination or (B) subsequent to the initial Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their common stock for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 6,733,333 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating gross proceeds of $10.1 million. In connection with the consummation of the sale of additional Units pursuant to the underwriters’ over-allotment option, on August 26, 2020, the Company sold an additional 447,801 Private Placement Warrants to the Sponsor, generating additional gross proceeds of approximately $0.7 million. Each Private Placement Warrant is exercisable for one share of Class A common stock at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants will be added to the proceeds from the Initial Public Offering to be held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors have agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Loans The Company’s Sponsor has agreed to loan the Company up to $300,000 to cover expenses related to the Initial Public Offering pursuant to a promissory note, dated November 8, 2018 and later amended on July 10, 2020 (the “Note”). This loan is non-interest bearing and payable upon the completion of the Initial Public Offering. In 2018 and 2019, the Company borrowed approximately $182,000 under the Note and repaid approximately $125,000 when it temporary halted the Initial Public Offering in September 2019. The Company recapitalized and continued in July 2020, and borrowed an additional of $235,000 under the Note. The Company fully repaid the remaining balance the Note of approximately $292,000 on August 20, 2020. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination is not completed, the Company may use a portion of the proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. As of March 31, 2021 and December 31, 2020, no Working Capital Loan was outstanding. Administrative Service Agreement Commencing on the date that the Company’s securities were first listed on the NYSE, the Company agreed to pay an affiliate of the Sponsor of total $10,000 per month for office space, utilities, secretarial support and administrative services. Upon completion of the initial Business Combination or the liquidation, the Company will cease paying these monthly fees. The Company incurred approximately $30,000 in administrative expenses under the agreement, which is recognized in the accompanying unaudited consolidated condensed statements of operations for the three months ended March 31, 2021 within general and administrative expenses –related party. As of March 31, 2021 and December 31, 2020, there were $0 and $50,000 in accounts payable – related party outstanding, as reflected in the accompanying consolidated condensed balance sheets.	Note 5 — Related Party Transactions Founder Shares On November 8, 2018, the Sponsor purchased 2,875,000 shares (the “Founder Shares”) of the Company’s Class B common stock, par value $0.0001 per share, for an aggregate price of $25,000. On July 13, 2020, the Company effected a stock split resulting in the Sponsor holding 10,062,500 Founder Shares. All shares and the associated amounts have been retroactively restated to reflect the aforementioned stock split. On July 29, 2020, the Sponsor transferred 40,000 Founder Shares to each of Desirée Rogers and C. Park Shaper, the Company’s independent director nominees. The initial stockholders agreed to forfeit up to 1,312,500 Founder Shares to the extent that the over- allotment option is not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the outstanding shares after the Initial Public Offering. The underwriters partially exercised their over-allotment option on August 26, 2020, with the remaining portion of the over-allotment option expiring at the conclusion of the 45-day option period. As a result, an aggregate of 472,874 Founder Shares were forfeited upon the expiration of the over- allotment option. The Founder Shares will automatically convert into Class A common stock on a one-for-one basis at the time of the Company’s initial Business Combination and are subject to certain transfer restrictions, as described below. In the case that additional shares of Class A common stock, or equity-linked securities, are issued or deemed issued in excess of the amounts sold in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which shares of Class B common stock shall convert into shares of Class A common stock will be adjusted (unless the holders of a majority of the outstanding shares of Class B common stock agree to waive such adjustment with respect to any such issuance or deemed issuance) so that the number of shares of Class A common stock issuable upon conversion of all shares of Class B common stock will equal, in the aggregate, on an as-converted basis, 20% of the sum of the total number of all shares of common stock outstanding upon the completion of the Initial Public Offering plus all shares of Class A common stock and equity-linked securities issued or deemed issued in connection with the Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the Business Combination). The initial stockholders agreed, subject to limited exceptions, not to transfer, assign or sell any of their Founder Shares until the earlier to occur of: (A) one year after the completion of the initial Business Combination or (B) subsequent to the initial Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their common stock for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 6,733,333 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating gross proceeds of $10.1 million. In connection with the consummation of the sale of additional Units pursuant to the underwriters’ over-allotment option, on August 26, 2020, the Company sold an additional 447,801 Private Placement Warrants to the Sponsor, generating additional gross proceeds of approximately $0.7 million. Each Private Placement Warrant is exercisable for one share of Class A common stock at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants will be added to the proceeds from the Initial Public Offering to be held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors have agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Reimbursements and Loans The Company’s Sponsor had agreed to loan the Company up to $300,000 to cover expenses related to the Initial Public Offering pursuant to a promissory note, dated November 8, 2018 and later amended on July 10, 2020 (the “Note”). This loan was non-interest bearing and payable upon the completion of the Initial Public Offering. In 2018 and 2019, the Company borrowed approximately $182,000 under the Note and repaid approximately $125,000 when it temporarily halted the Initial Public Offering in September 2019. The Company recapitalized and continued in July 2020, and borrowed an additional of $235,000 under the Note. The Company fully repaid the remaining balance the Note of approximately $292,000 on August 20, 2020. During the year ended December 31, 2020, the Company reimbursed affiliates of the sponsor for costs incurred of approximately $113,000. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination is not completed, the Company may use a portion of the proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. As of December 31, 2020 and 2019, no Working Capital Loan was outstanding. Administrative Service Agreement Commencing on the date that the Company’s securities were first listed on the NYSE, the Company agreed to pay an affiliate of the Sponsor of total $10,000 per month for office space, utilities, secretarial support and administrative services. Upon completion of the initial Business Combination or the liquidation, the Company will cease paying these monthly fees. The Company incurred approximately $50,000 in administrative expenses under the agreement, which is recognized in the accompanying consolidated statements of operations for the year ended December 31, 2020 within general and administrative expenses – related party. As of December 31, 2020, an aggregate of $50,000 in accounts payable - related party was outstanding, as reflected in the accompanying balance sheets.

Related Party Transactions

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Star Peak Energy Transition Corp [Member]

Note 4—Related Party Transactions

Founder Shares

On November 8, 2018, the Sponsor purchased 2,875,000 shares (the “Founder Shares”) of the Company’s Class B common stock, par value $0.0001 per share, for an aggregate price of $25,000. On July 13, 2020, the Company effected a stock split resulting in the Sponsor holding 10,062,500 Founder Shares. All shares and the associated amounts have been retroactively restated to reflect the aforementioned stock split. On July 29, 2020, the Sponsor transferred 40,000 Founder Shares to each of Desirée Rogers and C. Park Shaper, the Company’s independent director nominees. The initial stockholders agreed to forfeit up to 1,312,500 Founder Shares to the extent that the over-allotment option is not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the outstanding shares after the Initial Public Offering. The underwriters partially exercised their over-allotment option on August 26, 2020, with the remaining portion of the over-allotment option expiring at the conclusion of the 45-day option period. As a result, an aggregate of 472,874 Founder Shares were forfeited upon the expiration of the over-allotment option.

The Founder Shares automatically converted into common stock on a one-for-one basis at the time of the Merger and are subject to certain transfer restrictions, as described below.

The initial stockholders have agreed, subject to limited exceptions, not to transfer, assign or sell any of their Founder Shares, or shares of common stock issued upon conversion there of, until the earlier to occur of: (A) one year after the completion of the initial Business Combination or (B) subsequent to the initial Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their common stock for cash, securities or other property.

Private Placement Warrants

Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 6,733,333 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating gross proceeds of $10.1 million. In connection with the consummation of the sale of additional Units pursuant to the underwriters’ over-allotment option, on August 26, 2020, the Company sold an additional 447,801 Private Placement Warrants to the Sponsor, generating additional gross proceeds of approximately $0.7 million.

Each Private Placement Warrant is exercisable for one share of Class A common stock at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants will be added to the proceeds from the Initial Public Offering to be held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees.

The Sponsor and the Company’s officers and directors have agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination.

Related Party Loans

The Company’s Sponsor has agreed to loan the Company up to $300,000 to cover expenses related to the Initial Public Offering pursuant to a promissory note, dated November 8, 2018 and later amended on July 10, 2020 (the “Note”). This loan is non-interest bearing and payable upon the completion of the Initial Public Offering. In 2018 and 2019, the Company borrowed approximately $182,000 under the Note and repaid approximately $125,000 when it temporary halted the Initial Public Offering in September 2019. The Company recapitalized and continued in July 2020, and borrowed an additional of $235,000 under the Note. The Company fully repaid the remaining balance the Note of approximately $292,000 on August 20, 2020.

In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination is not completed, the Company may use a portion of the proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1.5 million of such Working Capital Loans may be convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. As of March 31, 2021 and December 31, 2020, no Working Capital Loan was outstanding.

Administrative Service Agreement

Commencing on the date that the Company’s securities were first listed on the NYSE, the Company agreed to pay an affiliate of the Sponsor of total $10,000 per month for office space, utilities, secretarial support and administrative services. Upon completion of the initial Business Combination or the liquidation, the Company will cease paying these monthly fees. The Company incurred approximately $30,000 in administrative expenses under the agreement, which is recognized in the accompanying unaudited consolidated condensed statements of operations for the three months ended March 31, 2021 within general and administrative expenses –related party. As of March 31, 2021 and December 31, 2020, there were $0 and $50,000 in accounts payable – related party outstanding, as reflected in the accompanying consolidated condensed balance sheets.

Note 5 — Related Party Transactions

Founder Shares

On November 8, 2018, the Sponsor purchased 2,875,000 shares (the “Founder Shares”) of the Company’s Class B common stock, par value $0.0001 per share, for an aggregate price of $25,000. On July 13, 2020, the Company effected a stock split resulting in the Sponsor holding 10,062,500 Founder Shares. All shares and the associated amounts have been retroactively restated to reflect the aforementioned stock split. On July 29, 2020, the Sponsor transferred 40,000 Founder Shares to each of Desirée Rogers and C. Park Shaper, the Company’s independent director nominees. The initial stockholders agreed to forfeit up to 1,312,500 Founder Shares to the extent that the over- allotment option is not exercised in full by the underwriters, so that the Founder Shares would represent 20% of the outstanding shares after the Initial Public Offering. The underwriters partially exercised their over-allotment option on August 26, 2020, with the remaining portion of the over-allotment option expiring at the conclusion of the 45-day option period. As a result, an aggregate of 472,874 Founder Shares were forfeited upon the expiration of the over- allotment option.

The Founder Shares will automatically convert into Class A common stock on a one-for-one basis at the time of the Company’s initial Business Combination and are subject to certain transfer restrictions, as described below. In the case that additional shares of Class A common stock, or equity-linked securities, are issued or deemed issued in excess of the amounts sold in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which shares of Class B common stock shall convert into shares of Class A common stock will be adjusted (unless the holders of a majority of the outstanding shares of Class B common stock agree to waive such adjustment with respect to any such issuance or deemed issuance) so that the number of shares of Class A common stock issuable upon conversion of all shares of Class B common stock will equal, in the aggregate, on an as-converted basis, 20% of the sum of the total number of all shares of common stock outstanding upon the completion of the Initial Public Offering plus all shares of Class A common stock and equity-linked securities issued or deemed issued in connection with the Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the Business Combination).

The initial stockholders agreed, subject to limited exceptions, not to transfer, assign or sell any of their Founder Shares until the earlier to occur of: (A) one year after the completion of the initial Business Combination or (B) subsequent to the initial Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their common stock for cash, securities or other property.

Private Placement Warrants

Related Party Reimbursements and Loans

The Company’s Sponsor had agreed to loan the Company up to $300,000 to cover expenses related to the Initial Public Offering pursuant to a promissory note, dated November 8, 2018 and later amended on July 10, 2020 (the “Note”). This loan was non-interest bearing and payable upon the completion of the Initial Public Offering. In 2018 and 2019, the Company borrowed approximately $182,000 under the Note and repaid approximately $125,000 when it temporarily halted the Initial Public Offering in September 2019. The Company recapitalized and continued in July 2020, and borrowed an additional of $235,000 under the Note. The Company fully repaid the remaining balance the Note of approximately $292,000 on August 20, 2020.

During the year ended December 31, 2020, the Company reimbursed affiliates of the sponsor for costs incurred of approximately $113,000.

convertible into warrants of the post Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. As of December 31, 2020 and 2019, no Working Capital Loan was outstanding.

Administrative Service Agreement

Commencing on the date that the Company’s securities were first listed on the NYSE, the Company agreed to pay an affiliate of the Sponsor of total $10,000 per month for office space, utilities, secretarial support and administrative services. Upon completion of the initial Business Combination or the liquidation, the Company will cease paying these monthly fees. The Company incurred approximately $50,000 in administrative expenses under the agreement, which is recognized in the accompanying consolidated statements of operations for the year ended December 31, 2020 within general and administrative expenses – related party. As of December 31, 2020, an aggregate of $50,000 in accounts payable - related party was outstanding, as reflected in the accompanying balance sheets.